mirror of
https://github.com/encode/django-rest-framework.git
synced 2024-09-21 19:39:01 +03:00
950 lines
33 KiB
Python
950 lines
33 KiB
Python
from django.conf import settings
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from django.core import validators
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from django.core.exceptions import ValidationError
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from django.utils import timezone
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from django.utils.datastructures import SortedDict
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from django.utils.dateparse import parse_date, parse_datetime, parse_time
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from django.utils.encoding import is_protected_type
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from django.utils.translation import ugettext_lazy as _
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from rest_framework import ISO_8601
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from rest_framework.compat import smart_text, EmailValidator, MinValueValidator, MaxValueValidator, URLValidator
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from rest_framework.settings import api_settings
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from rest_framework.utils import html, representation, humanize_datetime
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import copy
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import datetime
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import decimal
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import inspect
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import re
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class empty:
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"""
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This class is used to represent no data being provided for a given input
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or output value.
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It is required because `None` may be a valid input or output value.
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"""
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pass
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def is_simple_callable(obj):
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"""
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True if the object is a callable that takes no arguments.
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"""
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function = inspect.isfunction(obj)
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method = inspect.ismethod(obj)
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if not (function or method):
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return False
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args, _, _, defaults = inspect.getargspec(obj)
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len_args = len(args) if function else len(args) - 1
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len_defaults = len(defaults) if defaults else 0
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return len_args <= len_defaults
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def get_attribute(instance, attrs):
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"""
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Similar to Python's built in `getattr(instance, attr)`,
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but takes a list of nested attributes, instead of a single attribute.
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Also accepts either attribute lookup on objects or dictionary lookups.
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"""
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for attr in attrs:
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try:
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instance = getattr(instance, attr)
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except AttributeError as exc:
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try:
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return instance[attr]
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except (KeyError, TypeError):
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raise exc
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return instance
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def set_value(dictionary, keys, value):
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"""
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Similar to Python's built in `dictionary[key] = value`,
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but takes a list of nested keys instead of a single key.
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set_value({'a': 1}, [], {'b': 2}) -> {'a': 1, 'b': 2}
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set_value({'a': 1}, ['x'], 2) -> {'a': 1, 'x': 2}
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set_value({'a': 1}, ['x', 'y'], 2) -> {'a': 1, 'x': {'y': 2}}
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"""
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if not keys:
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dictionary.update(value)
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return
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for key in keys[:-1]:
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if key not in dictionary:
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dictionary[key] = {}
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dictionary = dictionary[key]
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dictionary[keys[-1]] = value
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class SkipField(Exception):
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pass
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NOT_READ_ONLY_WRITE_ONLY = 'May not set both `read_only` and `write_only`'
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NOT_READ_ONLY_REQUIRED = 'May not set both `read_only` and `required`'
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NOT_READ_ONLY_DEFAULT = 'May not set both `read_only` and `default`'
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NOT_REQUIRED_DEFAULT = 'May not set both `required` and `default`'
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MISSING_ERROR_MESSAGE = (
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'ValidationError raised by `{class_name}`, but error key `{key}` does '
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'not exist in the `error_messages` dictionary.'
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)
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class Field(object):
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_creation_counter = 0
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default_error_messages = {
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'required': _('This field is required.'),
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'null': _('This field may not be null.')
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}
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default_validators = []
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default_empty_html = None
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def __init__(self, read_only=False, write_only=False,
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required=None, default=empty, initial=None, source=None,
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label=None, help_text=None, style=None,
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error_messages=None, validators=[], allow_null=False,
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context=None):
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self._creation_counter = Field._creation_counter
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Field._creation_counter += 1
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# If `required` is unset, then use `True` unless a default is provided.
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if required is None:
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required = default is empty and not read_only
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# Some combinations of keyword arguments do not make sense.
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assert not (read_only and write_only), NOT_READ_ONLY_WRITE_ONLY
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assert not (read_only and required), NOT_READ_ONLY_REQUIRED
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assert not (read_only and default is not empty), NOT_READ_ONLY_DEFAULT
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assert not (required and default is not empty), NOT_REQUIRED_DEFAULT
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self.read_only = read_only
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self.write_only = write_only
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self.required = required
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self.default = default
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self.source = source
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self.initial = initial
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self.label = label
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self.help_text = help_text
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self.style = {} if style is None else style
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self.validators = validators or self.default_validators[:]
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self.allow_null = allow_null
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# These are set up by `.bind()` when the field is added to a serializer.
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self.field_name = None
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self.parent = None
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self._context = {} if (context is None) else context
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# Collect default error message from self and parent classes
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messages = {}
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for cls in reversed(self.__class__.__mro__):
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messages.update(getattr(cls, 'default_error_messages', {}))
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messages.update(error_messages or {})
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self.error_messages = messages
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def __new__(cls, *args, **kwargs):
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"""
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When a field is instantiated, we store the arguments that were used,
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so that we can present a helpful representation of the object.
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"""
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instance = super(Field, cls).__new__(cls)
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instance._args = args
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instance._kwargs = kwargs
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return instance
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def __deepcopy__(self, memo):
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args = copy.deepcopy(self._args)
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kwargs = copy.deepcopy(self._kwargs)
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return self.__class__(*args, **kwargs)
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@property
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def context(self):
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root = self
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while root.parent is not None:
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root = root.parent
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return root._context
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def bind(self, field_name, parent):
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"""
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Setup the context for the field instance.
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"""
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# In order to enforce a consistent style, we error if a redundant
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# 'source' argument has been used. For example:
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# my_field = serializer.CharField(source='my_field')
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assert self.source != field_name, (
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"It is redundant to specify `source='%s'` on field '%s' in "
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"serializer '%s', because it is the same as the field name. "
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"Remove the `source` keyword argument." %
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(field_name, self.__class__.__name__, parent.__class__.__name__)
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)
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self.field_name = field_name
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self.parent = parent
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# `self.label` should default to being based on the field name.
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if self.label is None:
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self.label = field_name.replace('_', ' ').capitalize()
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# self.source should default to being the same as the field name.
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if self.source is None:
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self.source = field_name
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# self.source_attrs is a list of attributes that need to be looked up
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# when serializing the instance, or populating the validated data.
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if self.source == '*':
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self.source_attrs = []
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else:
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self.source_attrs = self.source.split('.')
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def get_initial(self):
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"""
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Return a value to use when the field is being returned as a primative
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value, without any object instance.
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"""
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return self.initial
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def get_value(self, dictionary):
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"""
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Given the *incoming* primative data, return the value for this field
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that should be validated and transformed to a native value.
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"""
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if html.is_html_input(dictionary):
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# HTML forms will represent empty fields as '', and cannot
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# represent None or False values directly.
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ret = dictionary.get(self.field_name, '')
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return self.default_empty_html if (ret == '') else ret
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return dictionary.get(self.field_name, empty)
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def get_attribute(self, instance):
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"""
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Given the *outgoing* object instance, return the value for this field
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that should be returned as a primative value.
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"""
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return get_attribute(instance, self.source_attrs)
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def get_default(self):
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"""
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Return the default value to use when validating data if no input
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is provided for this field.
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If a default has not been set for this field then this will simply
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return `empty`, indicating that no value should be set in the
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validated data for this field.
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"""
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if self.default is empty:
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raise SkipField()
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return self.default
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def run_validation(self, data=empty):
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"""
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Validate a simple representation and return the internal value.
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The provided data may be `empty` if no representation was included
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in the input.
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May raise `SkipField` if the field should not be included in the
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validated data.
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"""
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if data is empty:
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if self.required:
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self.fail('required')
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return self.get_default()
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if data is None:
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if not self.allow_null:
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self.fail('null')
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return None
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value = self.to_internal_value(data)
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self.run_validators(value)
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return value
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def run_validators(self, value):
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"""
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Test the given value against all the validators on the field,
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and either raise a `ValidationError` or simply return.
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"""
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errors = []
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for validator in self.validators:
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try:
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validator(value)
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except ValidationError as exc:
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errors.extend(exc.messages)
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if errors:
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raise ValidationError(errors)
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def to_internal_value(self, data):
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"""
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Transform the *incoming* primative data into a native value.
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"""
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raise NotImplementedError('to_internal_value() must be implemented.')
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def to_representation(self, value):
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"""
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Transform the *outgoing* native value into primative data.
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"""
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raise NotImplementedError('to_representation() must be implemented.')
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def fail(self, key, **kwargs):
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"""
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A helper method that simply raises a validation error.
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"""
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try:
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msg = self.error_messages[key]
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except KeyError:
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class_name = self.__class__.__name__
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msg = MISSING_ERROR_MESSAGE.format(class_name=class_name, key=key)
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raise AssertionError(msg)
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raise ValidationError(msg.format(**kwargs))
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def __repr__(self):
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return representation.field_repr(self)
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# Boolean types...
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class BooleanField(Field):
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default_error_messages = {
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'invalid': _('`{input}` is not a valid boolean.')
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}
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default_empty_html = False
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initial = False
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TRUE_VALUES = set(('t', 'T', 'true', 'True', 'TRUE', '1', 1, True))
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FALSE_VALUES = set(('f', 'F', 'false', 'False', 'FALSE', '0', 0, 0.0, False))
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def __init__(self, **kwargs):
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assert 'allow_null' not in kwargs, '`allow_null` is not a valid option. Use `NullBooleanField` instead.'
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super(BooleanField, self).__init__(**kwargs)
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def to_internal_value(self, data):
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if data in self.TRUE_VALUES:
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return True
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elif data in self.FALSE_VALUES:
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return False
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self.fail('invalid', input=data)
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def to_representation(self, value):
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if value in self.TRUE_VALUES:
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return True
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elif value in self.FALSE_VALUES:
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return False
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return bool(value)
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class NullBooleanField(Field):
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default_error_messages = {
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'invalid': _('`{input}` is not a valid boolean.')
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}
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default_empty_html = None
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TRUE_VALUES = set(('t', 'T', 'true', 'True', 'TRUE', '1', 1, True))
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FALSE_VALUES = set(('f', 'F', 'false', 'False', 'FALSE', '0', 0, 0.0, False))
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NULL_VALUES = set(('n', 'N', 'null', 'Null', 'NULL', '', None))
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def __init__(self, **kwargs):
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assert 'allow_null' not in kwargs, '`allow_null` is not a valid option.'
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kwargs['allow_null'] = True
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super(NullBooleanField, self).__init__(**kwargs)
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def to_internal_value(self, data):
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if data in self.TRUE_VALUES:
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return True
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elif data in self.FALSE_VALUES:
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return False
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elif data in self.NULL_VALUES:
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return None
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self.fail('invalid', input=data)
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def to_representation(self, value):
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if value in self.NULL_VALUES:
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return None
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if value in self.TRUE_VALUES:
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return True
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elif value in self.FALSE_VALUES:
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return False
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return bool(value)
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# String types...
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class CharField(Field):
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default_error_messages = {
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'blank': _('This field may not be blank.')
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}
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default_empty_html = ''
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initial = ''
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def __init__(self, **kwargs):
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self.allow_blank = kwargs.pop('allow_blank', False)
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self.max_length = kwargs.pop('max_length', None)
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self.min_length = kwargs.pop('min_length', None)
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super(CharField, self).__init__(**kwargs)
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def run_validation(self, data=empty):
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# Test for the empty string here so that it does not get validated,
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# and so that subclasses do not need to handle it explicitly
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# inside the `to_internal_value()` method.
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if data == '':
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if not self.allow_blank:
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self.fail('blank')
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return ''
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return super(CharField, self).run_validation(data)
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def to_internal_value(self, data):
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return str(data)
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def to_representation(self, value):
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if value is None:
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return None
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return str(value)
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class EmailField(CharField):
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default_error_messages = {
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'invalid': _('Enter a valid email address.')
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}
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def __init__(self, **kwargs):
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super(EmailField, self).__init__(**kwargs)
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validator = EmailValidator(message=self.error_messages['invalid'])
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self.validators.append(validator)
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def to_internal_value(self, data):
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return str(data).strip()
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def to_representation(self, value):
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if value is None:
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return None
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return str(value).strip()
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class RegexField(CharField):
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default_error_messages = {
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'invalid': _('This value does not match the required pattern.')
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}
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def __init__(self, regex, **kwargs):
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super(RegexField, self).__init__(**kwargs)
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validator = validators.RegexValidator(regex, message=self.error_messages['invalid'])
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self.validators.append(validator)
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class SlugField(CharField):
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default_error_messages = {
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'invalid': _("Enter a valid 'slug' consisting of letters, numbers, underscores or hyphens.")
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}
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def __init__(self, **kwargs):
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super(SlugField, self).__init__(**kwargs)
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slug_regex = re.compile(r'^[-a-zA-Z0-9_]+$')
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validator = validators.RegexValidator(slug_regex, message=self.error_messages['invalid'])
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self.validators.append(validator)
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class URLField(CharField):
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default_error_messages = {
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'invalid': _("Enter a valid URL.")
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}
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def __init__(self, **kwargs):
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super(URLField, self).__init__(**kwargs)
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validator = URLValidator(message=self.error_messages['invalid'])
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self.validators.append(validator)
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# Number types...
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class IntegerField(Field):
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default_error_messages = {
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'invalid': _('A valid integer is required.'),
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'max_value': _('Ensure this value is less than or equal to {max_value}.'),
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'min_value': _('Ensure this value is greater than or equal to {min_value}.'),
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}
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def __init__(self, **kwargs):
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max_value = kwargs.pop('max_value', None)
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min_value = kwargs.pop('min_value', None)
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super(IntegerField, self).__init__(**kwargs)
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if max_value is not None:
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message = self.error_messages['max_value'].format(max_value=max_value)
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self.validators.append(MaxValueValidator(max_value, message=message))
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if min_value is not None:
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message = self.error_messages['min_value'].format(min_value=min_value)
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self.validators.append(MinValueValidator(min_value, message=message))
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def to_internal_value(self, data):
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try:
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data = int(str(data))
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except (ValueError, TypeError):
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self.fail('invalid')
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return data
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def to_representation(self, value):
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if value is None:
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return None
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return int(value)
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class FloatField(Field):
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default_error_messages = {
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'invalid': _("A valid number is required."),
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'max_value': _('Ensure this value is less than or equal to {max_value}.'),
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'min_value': _('Ensure this value is greater than or equal to {min_value}.'),
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}
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def __init__(self, **kwargs):
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max_value = kwargs.pop('max_value', None)
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min_value = kwargs.pop('min_value', None)
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super(FloatField, self).__init__(**kwargs)
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if max_value is not None:
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message = self.error_messages['max_value'].format(max_value=max_value)
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self.validators.append(MaxValueValidator(max_value, message=message))
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if min_value is not None:
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message = self.error_messages['min_value'].format(min_value=min_value)
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self.validators.append(MinValueValidator(min_value, message=message))
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def to_internal_value(self, value):
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try:
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return float(value)
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except (TypeError, ValueError):
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self.fail('invalid')
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def to_representation(self, value):
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if value is None:
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return None
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return float(value)
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class DecimalField(Field):
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default_error_messages = {
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'invalid': _('A valid number is required.'),
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'max_value': _('Ensure this value is less than or equal to {max_value}.'),
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'min_value': _('Ensure this value is greater than or equal to {min_value}.'),
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'max_digits': _('Ensure that there are no more than {max_digits} digits in total.'),
|
|
'max_decimal_places': _('Ensure that there are no more than {max_decimal_places} decimal places.'),
|
|
'max_whole_digits': _('Ensure that there are no more than {max_whole_digits} digits before the decimal point.')
|
|
}
|
|
|
|
coerce_to_string = api_settings.COERCE_DECIMAL_TO_STRING
|
|
|
|
def __init__(self, max_digits, decimal_places, coerce_to_string=None, max_value=None, min_value=None, **kwargs):
|
|
self.max_digits = max_digits
|
|
self.decimal_places = decimal_places
|
|
self.coerce_to_string = coerce_to_string if (coerce_to_string is not None) else self.coerce_to_string
|
|
super(DecimalField, self).__init__(**kwargs)
|
|
if max_value is not None:
|
|
message = self.error_messages['max_value'].format(max_value=max_value)
|
|
self.validators.append(MaxValueValidator(max_value, message=message))
|
|
if min_value is not None:
|
|
message = self.error_messages['min_value'].format(min_value=min_value)
|
|
self.validators.append(MinValueValidator(min_value, message=message))
|
|
|
|
def to_internal_value(self, value):
|
|
"""
|
|
Validates that the input is a decimal number. Returns a Decimal
|
|
instance. Returns None for empty values. Ensures that there are no more
|
|
than max_digits in the number, and no more than decimal_places digits
|
|
after the decimal point.
|
|
"""
|
|
value = smart_text(value).strip()
|
|
try:
|
|
value = decimal.Decimal(value)
|
|
except decimal.DecimalException:
|
|
self.fail('invalid')
|
|
|
|
# Check for NaN. It is the only value that isn't equal to itself,
|
|
# so we can use this to identify NaN values.
|
|
if value != value:
|
|
self.fail('invalid')
|
|
|
|
# Check for infinity and negative infinity.
|
|
if value in (decimal.Decimal('Inf'), decimal.Decimal('-Inf')):
|
|
self.fail('invalid')
|
|
|
|
sign, digittuple, exponent = value.as_tuple()
|
|
decimals = abs(exponent)
|
|
# digittuple doesn't include any leading zeros.
|
|
digits = len(digittuple)
|
|
if decimals > digits:
|
|
# We have leading zeros up to or past the decimal point. Count
|
|
# everything past the decimal point as a digit. We do not count
|
|
# 0 before the decimal point as a digit since that would mean
|
|
# we would not allow max_digits = decimal_places.
|
|
digits = decimals
|
|
whole_digits = digits - decimals
|
|
|
|
if self.max_digits is not None and digits > self.max_digits:
|
|
self.fail('max_digits', max_digits=self.max_digits)
|
|
if self.decimal_places is not None and decimals > self.decimal_places:
|
|
self.fail('max_decimal_places', max_decimal_places=self.decimal_places)
|
|
if self.max_digits is not None and self.decimal_places is not None and whole_digits > (self.max_digits - self.decimal_places):
|
|
self.fail('max_whole_digits', max_whole_digits=self.max_digits - self.decimal_places)
|
|
|
|
return value
|
|
|
|
def to_representation(self, value):
|
|
if value in (None, ''):
|
|
return None
|
|
|
|
if not isinstance(value, decimal.Decimal):
|
|
value = decimal.Decimal(str(value).strip())
|
|
|
|
context = decimal.getcontext().copy()
|
|
context.prec = self.max_digits
|
|
quantized = value.quantize(
|
|
decimal.Decimal('.1') ** self.decimal_places,
|
|
context=context
|
|
)
|
|
if not self.coerce_to_string:
|
|
return quantized
|
|
return '{0:f}'.format(quantized)
|
|
|
|
|
|
# Date & time fields...
|
|
|
|
class DateTimeField(Field):
|
|
default_error_messages = {
|
|
'invalid': _('Datetime has wrong format. Use one of these formats instead: {format}'),
|
|
'date': _('Expected a datetime but got a date.'),
|
|
}
|
|
format = api_settings.DATETIME_FORMAT
|
|
input_formats = api_settings.DATETIME_INPUT_FORMATS
|
|
default_timezone = timezone.get_default_timezone() if settings.USE_TZ else None
|
|
|
|
def __init__(self, format=empty, input_formats=None, default_timezone=None, *args, **kwargs):
|
|
self.format = format if format is not empty else self.format
|
|
self.input_formats = input_formats if input_formats is not None else self.input_formats
|
|
self.default_timezone = default_timezone if default_timezone is not None else self.default_timezone
|
|
super(DateTimeField, self).__init__(*args, **kwargs)
|
|
|
|
def enforce_timezone(self, value):
|
|
"""
|
|
When `self.default_timezone` is `None`, always return naive datetimes.
|
|
When `self.default_timezone` is not `None`, always return aware datetimes.
|
|
"""
|
|
if (self.default_timezone is not None) and not timezone.is_aware(value):
|
|
return timezone.make_aware(value, self.default_timezone)
|
|
elif (self.default_timezone is None) and timezone.is_aware(value):
|
|
return timezone.make_naive(value, timezone.UTC())
|
|
return value
|
|
|
|
def to_internal_value(self, value):
|
|
if (isinstance(value, datetime.date) and not isinstance(value, datetime.datetime):
|
|
self.fail('date')
|
|
|
|
if isinstance(value, datetime.datetime):
|
|
return self.enforce_timezone(value)
|
|
|
|
for format in self.input_formats:
|
|
if format.lower() == ISO_8601:
|
|
try:
|
|
parsed = parse_datetime(value)
|
|
except (ValueError, TypeError):
|
|
pass
|
|
else:
|
|
if parsed is not None:
|
|
return self.enforce_timezone(parsed)
|
|
else:
|
|
try:
|
|
parsed = datetime.datetime.strptime(value, format)
|
|
except (ValueError, TypeError):
|
|
pass
|
|
else:
|
|
return self.enforce_timezone(parsed)
|
|
|
|
humanized_format = humanize_datetime.datetime_formats(self.input_formats)
|
|
self.fail('invalid', format=humanized_format)
|
|
|
|
def to_representation(self, value):
|
|
if value is None or self.format is None:
|
|
return value
|
|
|
|
if self.format.lower() == ISO_8601:
|
|
ret = value.isoformat()
|
|
if ret.endswith('+00:00'):
|
|
ret = ret[:-6] + 'Z'
|
|
return ret
|
|
return value.strftime(self.format)
|
|
|
|
|
|
class DateField(Field):
|
|
default_error_messages = {
|
|
'invalid': _('Date has wrong format. Use one of these formats instead: {format}'),
|
|
'datetime': _('Expected a date but got a datetime.'),
|
|
}
|
|
format = api_settings.DATE_FORMAT
|
|
input_formats = api_settings.DATE_INPUT_FORMATS
|
|
|
|
def __init__(self, format=empty, input_formats=None, *args, **kwargs):
|
|
self.format = format if format is not empty else self.format
|
|
self.input_formats = input_formats if input_formats is not None else self.input_formats
|
|
super(DateField, self).__init__(*args, **kwargs)
|
|
|
|
def to_internal_value(self, value):
|
|
if isinstance(value, datetime.datetime):
|
|
self.fail('datetime')
|
|
|
|
if isinstance(value, datetime.date):
|
|
return value
|
|
|
|
for format in self.input_formats:
|
|
if format.lower() == ISO_8601:
|
|
try:
|
|
parsed = parse_date(value)
|
|
except (ValueError, TypeError):
|
|
pass
|
|
else:
|
|
if parsed is not None:
|
|
return parsed
|
|
else:
|
|
try:
|
|
parsed = datetime.datetime.strptime(value, format)
|
|
except (ValueError, TypeError):
|
|
pass
|
|
else:
|
|
return parsed.date()
|
|
|
|
humanized_format = humanize_datetime.date_formats(self.input_formats)
|
|
self.fail('invalid', format=humanized_format)
|
|
|
|
def to_representation(self, value):
|
|
if value is None or self.format is None:
|
|
return value
|
|
|
|
# Applying a `DateField` to a datetime value is almost always
|
|
# not a sensible thing to do, as it means naively dropping
|
|
# any explicit or implicit timezone info.
|
|
assert not isinstance(value, datetime.datetime), (
|
|
'Expected a `date`, but got a `datetime`. Refusing to coerce, '
|
|
'as this may mean losing timezone information. Use a custom '
|
|
'read-only field and deal with timezone issues explicitly.'
|
|
)
|
|
|
|
if self.format.lower() == ISO_8601:
|
|
return value.isoformat()
|
|
return value.strftime(self.format)
|
|
|
|
|
|
class TimeField(Field):
|
|
default_error_messages = {
|
|
'invalid': _('Time has wrong format. Use one of these formats instead: {format}'),
|
|
}
|
|
format = api_settings.TIME_FORMAT
|
|
input_formats = api_settings.TIME_INPUT_FORMATS
|
|
|
|
def __init__(self, format=empty, input_formats=None, *args, **kwargs):
|
|
self.format = format if format is not empty else self.format
|
|
self.input_formats = input_formats if input_formats is not None else self.input_formats
|
|
super(TimeField, self).__init__(*args, **kwargs)
|
|
|
|
def to_internal_value(self, value):
|
|
if isinstance(value, datetime.time):
|
|
return value
|
|
|
|
for format in self.input_formats:
|
|
if format.lower() == ISO_8601:
|
|
try:
|
|
parsed = parse_time(value)
|
|
except (ValueError, TypeError):
|
|
pass
|
|
else:
|
|
if parsed is not None:
|
|
return parsed
|
|
else:
|
|
try:
|
|
parsed = datetime.datetime.strptime(value, format)
|
|
except (ValueError, TypeError):
|
|
pass
|
|
else:
|
|
return parsed.time()
|
|
|
|
humanized_format = humanize_datetime.time_formats(self.input_formats)
|
|
self.fail('invalid', format=humanized_format)
|
|
|
|
def to_representation(self, value):
|
|
if value is None or self.format is None:
|
|
return value
|
|
|
|
# Applying a `TimeField` to a datetime value is almost always
|
|
# not a sensible thing to do, as it means naively dropping
|
|
# any explicit or implicit timezone info.
|
|
assert not isinstance(value, datetime.datetime), (
|
|
'Expected a `time`, but got a `datetime`. Refusing to coerce, '
|
|
'as this may mean losing timezone information. Use a custom '
|
|
'read-only field and deal with timezone issues explicitly.'
|
|
)
|
|
|
|
if self.format.lower() == ISO_8601:
|
|
return value.isoformat()
|
|
return value.strftime(self.format)
|
|
|
|
|
|
# Choice types...
|
|
|
|
class ChoiceField(Field):
|
|
default_error_messages = {
|
|
'invalid_choice': _('`{input}` is not a valid choice.')
|
|
}
|
|
|
|
def __init__(self, choices, **kwargs):
|
|
# Allow either single or paired choices style:
|
|
# choices = [1, 2, 3]
|
|
# choices = [(1, 'First'), (2, 'Second'), (3, 'Third')]
|
|
pairs = [
|
|
isinstance(item, (list, tuple)) and len(item) == 2
|
|
for item in choices
|
|
]
|
|
if all(pairs):
|
|
self.choices = SortedDict([(key, display_value) for key, display_value in choices])
|
|
else:
|
|
self.choices = SortedDict([(item, item) for item in choices])
|
|
|
|
# Map the string representation of choices to the underlying value.
|
|
# Allows us to deal with eg. integer choices while supporting either
|
|
# integer or string input, but still get the correct datatype out.
|
|
self.choice_strings_to_values = dict([
|
|
(str(key), key) for key in self.choices.keys()
|
|
])
|
|
|
|
super(ChoiceField, self).__init__(**kwargs)
|
|
|
|
def to_internal_value(self, data):
|
|
try:
|
|
return self.choice_strings_to_values[str(data)]
|
|
except KeyError:
|
|
self.fail('invalid_choice', input=data)
|
|
|
|
def to_representation(self, value):
|
|
return self.choice_strings_to_values[str(value)]
|
|
|
|
|
|
class MultipleChoiceField(ChoiceField):
|
|
default_error_messages = {
|
|
'invalid_choice': _('`{input}` is not a valid choice.'),
|
|
'not_a_list': _('Expected a list of items but got type `{input_type}`')
|
|
}
|
|
|
|
def to_internal_value(self, data):
|
|
if isinstance(data, type('')) or not hasattr(data, '__iter__'):
|
|
self.fail('not_a_list', input_type=type(data).__name__)
|
|
|
|
return set([
|
|
super(MultipleChoiceField, self).to_internal_value(item)
|
|
for item in data
|
|
])
|
|
|
|
def to_representation(self, value):
|
|
return set([
|
|
self.choice_strings_to_values[str(item)] for item in value
|
|
])
|
|
|
|
|
|
# File types...
|
|
|
|
class FileField(Field):
|
|
pass # TODO
|
|
|
|
|
|
class ImageField(Field):
|
|
pass # TODO
|
|
|
|
|
|
# Advanced field types...
|
|
|
|
class ReadOnlyField(Field):
|
|
"""
|
|
A read-only field that simply returns the field value.
|
|
|
|
If the field is a method with no parameters, the method will be called
|
|
and it's return value used as the representation.
|
|
|
|
For example, the following would call `get_expiry_date()` on the object:
|
|
|
|
class ExampleSerializer(self):
|
|
expiry_date = ReadOnlyField(source='get_expiry_date')
|
|
"""
|
|
|
|
def __init__(self, **kwargs):
|
|
kwargs['read_only'] = True
|
|
super(ReadOnlyField, self).__init__(**kwargs)
|
|
|
|
def to_representation(self, value):
|
|
if is_simple_callable(value):
|
|
return value()
|
|
return value
|
|
|
|
|
|
class SerializerMethodField(Field):
|
|
"""
|
|
A read-only field that get its representation from calling a method on the
|
|
parent serializer class. The method called will be of the form
|
|
"get_{field_name}", and should take a single argument, which is the
|
|
object being serialized.
|
|
|
|
For example:
|
|
|
|
class ExampleSerializer(self):
|
|
extra_info = SerializerMethodField()
|
|
|
|
def get_extra_info(self, obj):
|
|
return ... # Calculate some data to return.
|
|
"""
|
|
def __init__(self, method_name=None, **kwargs):
|
|
self.method_name = method_name
|
|
kwargs['source'] = '*'
|
|
kwargs['read_only'] = True
|
|
super(SerializerMethodField, self).__init__(**kwargs)
|
|
|
|
def bind(self, field_name, parent):
|
|
# In order to enforce a consistent style, we error if a redundant
|
|
# 'method_name' argument has been used. For example:
|
|
# my_field = serializer.CharField(source='my_field')
|
|
default_method_name = 'get_{field_name}'.format(field_name=field_name)
|
|
assert self.method_name != default_method_name, (
|
|
"It is redundant to specify `%s` on SerializerMethodField '%s' in "
|
|
"serializer '%s', because it is the same as the default method name. "
|
|
"Remove the `method_name` argument." %
|
|
(self.method_name, field_name, parent.__class__.__name__)
|
|
)
|
|
|
|
# The method name should default to `get_{field_name}`.
|
|
if self.method_name is None:
|
|
self.method_name = default_method_name
|
|
|
|
super(SerializerMethodField, self).bind(field_name, parent)
|
|
|
|
def to_representation(self, value):
|
|
method = getattr(self.parent, self.method_name)
|
|
return method(value)
|
|
|
|
|
|
class ModelField(Field):
|
|
"""
|
|
A generic field that can be used against an arbitrary model field.
|
|
|
|
This is used by `ModelSerializer` when dealing with custom model fields,
|
|
that do not have a serializer field to be mapped to.
|
|
"""
|
|
def __init__(self, model_field, **kwargs):
|
|
self.model_field = model_field
|
|
kwargs['source'] = '*'
|
|
super(ModelField, self).__init__(**kwargs)
|
|
|
|
def to_internal_value(self, data):
|
|
rel = getattr(self.model_field, 'rel', None)
|
|
if rel is not None:
|
|
return rel.to._meta.get_field(rel.field_name).to_python(data)
|
|
return self.model_field.to_python(data)
|
|
|
|
def to_representation(self, obj):
|
|
value = self.model_field._get_val_from_obj(obj)
|
|
if is_protected_type(value):
|
|
return value
|
|
return self.model_field.value_to_string(obj)
|