mirror of
https://github.com/encode/django-rest-framework.git
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637 lines
24 KiB
Python
637 lines
24 KiB
Python
"""
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Serializer fields that deal with relationships.
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These fields allow you to specify the style that should be used to represent
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model relationships, including hyperlinks, primary keys, or slugs.
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"""
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from __future__ import unicode_literals
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from django.core.exceptions import ObjectDoesNotExist, ValidationError
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from django.core.urlresolvers import resolve, get_script_prefix, NoReverseMatch
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from django import forms
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from django.db.models.fields import BLANK_CHOICE_DASH
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from django.forms import widgets
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from django.forms.models import ModelChoiceIterator
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from django.utils.translation import ugettext_lazy as _
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from rest_framework.fields import Field, WritableField, get_component, is_simple_callable
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from rest_framework.reverse import reverse
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from rest_framework.compat import urlparse
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from rest_framework.compat import smart_text
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import warnings
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##### Relational fields #####
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# Not actually Writable, but subclasses may need to be.
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class RelatedField(WritableField):
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"""
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Base class for related model fields.
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This represents a relationship using the unicode representation of the target.
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"""
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widget = widgets.Select
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many_widget = widgets.SelectMultiple
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form_field_class = forms.ChoiceField
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many_form_field_class = forms.MultipleChoiceField
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null_values = (None, '', 'None')
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cache_choices = False
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empty_label = None
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read_only = True
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many = False
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def __init__(self, *args, **kwargs):
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# 'null' is to be deprecated in favor of 'required'
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if 'null' in kwargs:
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warnings.warn('The `null` keyword argument is deprecated. '
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'Use the `required` keyword argument instead.',
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DeprecationWarning, stacklevel=2)
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kwargs['required'] = not kwargs.pop('null')
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queryset = kwargs.pop('queryset', None)
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self.many = kwargs.pop('many', self.many)
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if self.many:
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self.widget = self.many_widget
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self.form_field_class = self.many_form_field_class
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kwargs['read_only'] = kwargs.pop('read_only', self.read_only)
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super(RelatedField, self).__init__(*args, **kwargs)
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if not self.required:
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self.empty_label = BLANK_CHOICE_DASH[0][1]
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self.queryset = queryset
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def initialize(self, parent, field_name):
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super(RelatedField, self).initialize(parent, field_name)
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if self.queryset is None and not self.read_only:
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manager = getattr(self.parent.opts.model, self.source or field_name)
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if hasattr(manager, 'related'): # Forward
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self.queryset = manager.related.model._default_manager.all()
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else: # Reverse
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self.queryset = manager.field.rel.to._default_manager.all()
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### We need this stuff to make form choices work...
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def prepare_value(self, obj):
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return self.to_native(obj)
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def label_from_instance(self, obj):
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"""
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Return a readable representation for use with eg. select widgets.
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"""
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desc = smart_text(obj)
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ident = smart_text(self.to_native(obj))
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if desc == ident:
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return desc
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return "%s - %s" % (desc, ident)
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def _get_queryset(self):
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return self._queryset
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def _set_queryset(self, queryset):
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self._queryset = queryset
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self.widget.choices = self.choices
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queryset = property(_get_queryset, _set_queryset)
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def _get_choices(self):
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# If self._choices is set, then somebody must have manually set
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# the property self.choices. In this case, just return self._choices.
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if hasattr(self, '_choices'):
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return self._choices
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# Otherwise, execute the QuerySet in self.queryset to determine the
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# choices dynamically. Return a fresh ModelChoiceIterator that has not been
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# consumed. Note that we're instantiating a new ModelChoiceIterator *each*
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# time _get_choices() is called (and, thus, each time self.choices is
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# accessed) so that we can ensure the QuerySet has not been consumed. This
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# construct might look complicated but it allows for lazy evaluation of
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# the queryset.
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return ModelChoiceIterator(self)
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def _set_choices(self, value):
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# Setting choices also sets the choices on the widget.
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# choices can be any iterable, but we call list() on it because
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# it will be consumed more than once.
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self._choices = self.widget.choices = list(value)
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choices = property(_get_choices, _set_choices)
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### Regular serializer stuff...
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def field_to_native(self, obj, field_name):
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try:
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if self.source == '*':
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return self.to_native(obj)
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source = self.source or field_name
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value = obj
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for component in source.split('.'):
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if value is None:
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break
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value = get_component(value, component)
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except ObjectDoesNotExist:
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return None
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if value is None:
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return None
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if self.many:
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if is_simple_callable(getattr(value, 'all', None)):
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return [self.to_native(item) for item in value.all()]
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else:
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# Also support non-queryset iterables.
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# This allows us to also support plain lists of related items.
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return [self.to_native(item) for item in value]
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return self.to_native(value)
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def field_from_native(self, data, files, field_name, into):
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if self.read_only:
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return
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try:
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if self.many:
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try:
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# Form data
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value = data.getlist(field_name)
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if value == [''] or value == []:
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raise KeyError
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except AttributeError:
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# Non-form data
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value = data[field_name]
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else:
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value = data[field_name]
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except KeyError:
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if self.partial:
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return
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value = [] if self.many else None
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if value in self.null_values:
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if self.required:
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raise ValidationError(self.error_messages['required'])
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into[(self.source or field_name)] = None
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elif self.many:
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into[(self.source or field_name)] = [self.from_native(item) for item in value]
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else:
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into[(self.source or field_name)] = self.from_native(value)
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### PrimaryKey relationships
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class PrimaryKeyRelatedField(RelatedField):
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"""
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Represents a relationship as a pk value.
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"""
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read_only = False
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default_error_messages = {
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'does_not_exist': _("Invalid pk '%s' - object does not exist."),
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'incorrect_type': _('Incorrect type. Expected pk value, received %s.'),
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}
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# TODO: Remove these field hacks...
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def prepare_value(self, obj):
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return self.to_native(obj.pk)
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def label_from_instance(self, obj):
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"""
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Return a readable representation for use with eg. select widgets.
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"""
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desc = smart_text(obj)
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ident = smart_text(self.to_native(obj.pk))
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if desc == ident:
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return desc
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return "%s - %s" % (desc, ident)
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# TODO: Possibly change this to just take `obj`, through prob less performant
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def to_native(self, pk):
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return pk
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def from_native(self, data):
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if self.queryset is None:
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raise Exception('Writable related fields must include a `queryset` argument')
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try:
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return self.queryset.get(pk=data)
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except ObjectDoesNotExist:
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msg = self.error_messages['does_not_exist'] % smart_text(data)
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raise ValidationError(msg)
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except (TypeError, ValueError):
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received = type(data).__name__
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msg = self.error_messages['incorrect_type'] % received
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raise ValidationError(msg)
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def field_to_native(self, obj, field_name):
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if self.many:
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# To-many relationship
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queryset = None
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if not self.source:
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# Prefer obj.serializable_value for performance reasons
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try:
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queryset = obj.serializable_value(field_name)
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except AttributeError:
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pass
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if queryset is None:
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# RelatedManager (reverse relationship)
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source = self.source or field_name
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queryset = obj
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for component in source.split('.'):
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if queryset is None:
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return []
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queryset = get_component(queryset, component)
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# Forward relationship
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if is_simple_callable(getattr(queryset, 'all', None)):
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return [self.to_native(item.pk) for item in queryset.all()]
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else:
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# Also support non-queryset iterables.
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# This allows us to also support plain lists of related items.
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return [self.to_native(item.pk) for item in queryset]
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# To-one relationship
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try:
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# Prefer obj.serializable_value for performance reasons
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pk = obj.serializable_value(self.source or field_name)
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except AttributeError:
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# RelatedObject (reverse relationship)
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try:
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pk = getattr(obj, self.source or field_name).pk
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except (ObjectDoesNotExist, AttributeError):
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return None
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# Forward relationship
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return self.to_native(pk)
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### Slug relationships
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class SlugRelatedField(RelatedField):
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"""
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Represents a relationship using a unique field on the target.
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"""
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read_only = False
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default_error_messages = {
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'does_not_exist': _("Object with %s=%s does not exist."),
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'invalid': _('Invalid value.'),
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}
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def __init__(self, *args, **kwargs):
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self.slug_field = kwargs.pop('slug_field', None)
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assert self.slug_field, 'slug_field is required'
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super(SlugRelatedField, self).__init__(*args, **kwargs)
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def to_native(self, obj):
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return getattr(obj, self.slug_field)
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def from_native(self, data):
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if self.queryset is None:
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raise Exception('Writable related fields must include a `queryset` argument')
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try:
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return self.queryset.get(**{self.slug_field: data})
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except ObjectDoesNotExist:
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raise ValidationError(self.error_messages['does_not_exist'] %
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(self.slug_field, smart_text(data)))
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except (TypeError, ValueError):
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msg = self.error_messages['invalid']
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raise ValidationError(msg)
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### Hyperlinked relationships
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class HyperlinkedRelatedField(RelatedField):
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"""
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Represents a relationship using hyperlinking.
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"""
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read_only = False
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lookup_field = 'pk'
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default_error_messages = {
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'no_match': _('Invalid hyperlink - No URL match'),
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'incorrect_match': _('Invalid hyperlink - Incorrect URL match'),
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'configuration_error': _('Invalid hyperlink due to configuration error'),
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'does_not_exist': _("Invalid hyperlink - object does not exist."),
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'incorrect_type': _('Incorrect type. Expected url string, received %s.'),
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}
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# These are all pending deprecation
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pk_url_kwarg = 'pk'
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slug_field = 'slug'
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slug_url_kwarg = None # Defaults to same as `slug_field` unless overridden
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def __init__(self, *args, **kwargs):
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try:
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self.view_name = kwargs.pop('view_name')
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except KeyError:
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raise ValueError("Hyperlinked field requires 'view_name' kwarg")
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self.lookup_field = kwargs.pop('lookup_field', self.lookup_field)
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self.format = kwargs.pop('format', None)
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# These are pending deprecation
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if 'pk_url_kwarg' in kwargs:
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msg = 'pk_url_kwarg is pending deprecation. Use lookup_field instead.'
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warnings.warn(msg, PendingDeprecationWarning, stacklevel=2)
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if 'slug_url_kwarg' in kwargs:
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msg = 'slug_url_kwarg is pending deprecation. Use lookup_field instead.'
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warnings.warn(msg, PendingDeprecationWarning, stacklevel=2)
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if 'slug_field' in kwargs:
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msg = 'slug_field is pending deprecation. Use lookup_field instead.'
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warnings.warn(msg, PendingDeprecationWarning, stacklevel=2)
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self.pk_url_kwarg = kwargs.pop('pk_url_kwarg', self.pk_url_kwarg)
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self.slug_field = kwargs.pop('slug_field', self.slug_field)
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default_slug_kwarg = self.slug_url_kwarg or self.slug_field
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self.slug_url_kwarg = kwargs.pop('slug_url_kwarg', default_slug_kwarg)
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super(HyperlinkedRelatedField, self).__init__(*args, **kwargs)
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def get_url(self, obj, view_name, request, format):
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"""
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Given an object, return the URL that hyperlinks to the object.
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May raise a `NoReverseMatch` if the `view_name` and `lookup_field`
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attributes are not configured to correctly match the URL conf.
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"""
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lookup_field = getattr(obj, self.lookup_field)
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kwargs = {self.lookup_field: lookup_field}
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try:
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return reverse(view_name, kwargs=kwargs, request=request, format=format)
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except NoReverseMatch:
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pass
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if self.pk_url_kwarg != 'pk':
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# Only try pk if it has been explicitly set.
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# Otherwise, the default `lookup_field = 'pk'` has us covered.
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pk = obj.pk
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kwargs = {self.pk_url_kwarg: pk}
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try:
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return reverse(view_name, kwargs=kwargs, request=request, format=format)
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except NoReverseMatch:
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pass
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slug = getattr(obj, self.slug_field, None)
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if slug is not None:
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# Only try slug if it corresponds to an attribute on the object.
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kwargs = {self.slug_url_kwarg: slug}
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try:
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ret = reverse(view_name, kwargs=kwargs, request=request, format=format)
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if self.slug_field == 'slug' and self.slug_url_kwarg == 'slug':
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# If the lookup succeeds using the default slug params,
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# then `slug_field` is being used implicitly, and we
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# we need to warn about the pending deprecation.
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msg = 'Implicit slug field hyperlinked fields are pending deprecation.' \
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'You should set `lookup_field=slug` on the HyperlinkedRelatedField.'
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warnings.warn(msg, PendingDeprecationWarning, stacklevel=2)
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return ret
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except NoReverseMatch:
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pass
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raise NoReverseMatch()
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def get_object(self, queryset, view_name, view_args, view_kwargs):
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"""
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Return the object corresponding to a matched URL.
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Takes the matched URL conf arguments, and the queryset, and should
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return an object instance, or raise an `ObjectDoesNotExist` exception.
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"""
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lookup = view_kwargs.get(self.lookup_field, None)
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pk = view_kwargs.get(self.pk_url_kwarg, None)
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slug = view_kwargs.get(self.slug_url_kwarg, None)
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if lookup is not None:
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filter_kwargs = {self.lookup_field: lookup}
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elif pk is not None:
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filter_kwargs = {'pk': pk}
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elif slug is not None:
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filter_kwargs = {self.slug_field: slug}
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else:
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raise ObjectDoesNotExist()
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return queryset.get(**filter_kwargs)
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def to_native(self, obj):
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view_name = self.view_name
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request = self.context.get('request', None)
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format = self.format or self.context.get('format', None)
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if request is None:
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msg = (
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"Using `HyperlinkedRelatedField` without including the request "
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"in the serializer context is deprecated. "
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"Add `context={'request': request}` when instantiating "
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"the serializer."
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)
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warnings.warn(msg, DeprecationWarning, stacklevel=4)
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# If the object has not yet been saved then we cannot hyperlink to it.
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if getattr(obj, 'pk', None) is None:
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return
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# Return the hyperlink, or error if incorrectly configured.
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try:
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return self.get_url(obj, view_name, request, format)
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except NoReverseMatch:
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msg = (
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'Could not resolve URL for hyperlinked relationship using '
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'view name "%s". You may have failed to include the related '
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'model in your API, or incorrectly configured the '
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'`lookup_field` attribute on this field.'
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)
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raise Exception(msg % view_name)
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def from_native(self, value):
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# Convert URL -> model instance pk
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# TODO: Use values_list
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queryset = self.queryset
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if queryset is None:
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raise Exception('Writable related fields must include a `queryset` argument')
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try:
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http_prefix = value.startswith(('http:', 'https:'))
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except AttributeError:
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msg = self.error_messages['incorrect_type']
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raise ValidationError(msg % type(value).__name__)
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if http_prefix:
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# If needed convert absolute URLs to relative path
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value = urlparse.urlparse(value).path
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prefix = get_script_prefix()
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if value.startswith(prefix):
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value = '/' + value[len(prefix):]
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try:
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match = resolve(value)
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except Exception:
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raise ValidationError(self.error_messages['no_match'])
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if match.view_name != self.view_name:
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raise ValidationError(self.error_messages['incorrect_match'])
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try:
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return self.get_object(queryset, match.view_name,
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match.args, match.kwargs)
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except (ObjectDoesNotExist, TypeError, ValueError):
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raise ValidationError(self.error_messages['does_not_exist'])
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class HyperlinkedIdentityField(Field):
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"""
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Represents the instance, or a property on the instance, using hyperlinking.
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"""
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lookup_field = 'pk'
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read_only = True
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# These are all pending deprecation
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pk_url_kwarg = 'pk'
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slug_field = 'slug'
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slug_url_kwarg = None # Defaults to same as `slug_field` unless overridden
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def __init__(self, *args, **kwargs):
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try:
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self.view_name = kwargs.pop('view_name')
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except KeyError:
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msg = "HyperlinkedIdentityField requires 'view_name' argument"
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raise ValueError(msg)
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self.format = kwargs.pop('format', None)
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lookup_field = kwargs.pop('lookup_field', None)
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self.lookup_field = lookup_field or self.lookup_field
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# These are pending deprecation
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if 'pk_url_kwarg' in kwargs:
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msg = 'pk_url_kwarg is pending deprecation. Use lookup_field instead.'
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warnings.warn(msg, PendingDeprecationWarning, stacklevel=2)
|
|
if 'slug_url_kwarg' in kwargs:
|
|
msg = 'slug_url_kwarg is pending deprecation. Use lookup_field instead.'
|
|
warnings.warn(msg, PendingDeprecationWarning, stacklevel=2)
|
|
if 'slug_field' in kwargs:
|
|
msg = 'slug_field is pending deprecation. Use lookup_field instead.'
|
|
warnings.warn(msg, PendingDeprecationWarning, stacklevel=2)
|
|
|
|
self.slug_field = kwargs.pop('slug_field', self.slug_field)
|
|
default_slug_kwarg = self.slug_url_kwarg or self.slug_field
|
|
self.pk_url_kwarg = kwargs.pop('pk_url_kwarg', self.pk_url_kwarg)
|
|
self.slug_url_kwarg = kwargs.pop('slug_url_kwarg', default_slug_kwarg)
|
|
|
|
super(HyperlinkedIdentityField, self).__init__(*args, **kwargs)
|
|
|
|
def field_to_native(self, obj, field_name):
|
|
request = self.context.get('request', None)
|
|
format = self.context.get('format', None)
|
|
view_name = self.view_name
|
|
|
|
if request is None:
|
|
warnings.warn("Using `HyperlinkedIdentityField` without including the "
|
|
"request in the serializer context is deprecated. "
|
|
"Add `context={'request': request}` when instantiating the serializer.",
|
|
DeprecationWarning, stacklevel=4)
|
|
|
|
# By default use whatever format is given for the current context
|
|
# unless the target is a different type to the source.
|
|
#
|
|
# Eg. Consider a HyperlinkedIdentityField pointing from a json
|
|
# representation to an html property of that representation...
|
|
#
|
|
# '/snippets/1/' should link to '/snippets/1/highlight/'
|
|
# ...but...
|
|
# '/snippets/1/.json' should link to '/snippets/1/highlight/.html'
|
|
if format and self.format and self.format != format:
|
|
format = self.format
|
|
|
|
# Return the hyperlink, or error if incorrectly configured.
|
|
try:
|
|
return self.get_url(obj, view_name, request, format)
|
|
except NoReverseMatch:
|
|
msg = (
|
|
'Could not resolve URL for hyperlinked relationship using '
|
|
'view name "%s". You may have failed to include the related '
|
|
'model in your API, or incorrectly configured the '
|
|
'`lookup_field` attribute on this field.'
|
|
)
|
|
raise Exception(msg % view_name)
|
|
|
|
def get_url(self, obj, view_name, request, format):
|
|
"""
|
|
Given an object, return the URL that hyperlinks to the object.
|
|
|
|
May raise a `NoReverseMatch` if the `view_name` and `lookup_field`
|
|
attributes are not configured to correctly match the URL conf.
|
|
"""
|
|
lookup_field = getattr(obj, self.lookup_field, None)
|
|
kwargs = {self.lookup_field: lookup_field}
|
|
|
|
# Handle unsaved object case
|
|
if lookup_field is None:
|
|
return None
|
|
|
|
try:
|
|
return reverse(view_name, kwargs=kwargs, request=request, format=format)
|
|
except NoReverseMatch:
|
|
pass
|
|
|
|
if self.pk_url_kwarg != 'pk':
|
|
# Only try pk lookup if it has been explicitly set.
|
|
# Otherwise, the default `lookup_field = 'pk'` has us covered.
|
|
kwargs = {self.pk_url_kwarg: obj.pk}
|
|
try:
|
|
return reverse(view_name, kwargs=kwargs, request=request, format=format)
|
|
except NoReverseMatch:
|
|
pass
|
|
|
|
slug = getattr(obj, self.slug_field, None)
|
|
if slug:
|
|
# Only use slug lookup if a slug field exists on the model
|
|
kwargs = {self.slug_url_kwarg: slug}
|
|
try:
|
|
return reverse(view_name, kwargs=kwargs, request=request, format=format)
|
|
except NoReverseMatch:
|
|
pass
|
|
|
|
raise NoReverseMatch()
|
|
|
|
|
|
### Old-style many classes for backwards compat
|
|
|
|
class ManyRelatedField(RelatedField):
|
|
def __init__(self, *args, **kwargs):
|
|
warnings.warn('`ManyRelatedField()` is deprecated. '
|
|
'Use `RelatedField(many=True)` instead.',
|
|
DeprecationWarning, stacklevel=2)
|
|
kwargs['many'] = True
|
|
super(ManyRelatedField, self).__init__(*args, **kwargs)
|
|
|
|
|
|
class ManyPrimaryKeyRelatedField(PrimaryKeyRelatedField):
|
|
def __init__(self, *args, **kwargs):
|
|
warnings.warn('`ManyPrimaryKeyRelatedField()` is deprecated. '
|
|
'Use `PrimaryKeyRelatedField(many=True)` instead.',
|
|
DeprecationWarning, stacklevel=2)
|
|
kwargs['many'] = True
|
|
super(ManyPrimaryKeyRelatedField, self).__init__(*args, **kwargs)
|
|
|
|
|
|
class ManySlugRelatedField(SlugRelatedField):
|
|
def __init__(self, *args, **kwargs):
|
|
warnings.warn('`ManySlugRelatedField()` is deprecated. '
|
|
'Use `SlugRelatedField(many=True)` instead.',
|
|
DeprecationWarning, stacklevel=2)
|
|
kwargs['many'] = True
|
|
super(ManySlugRelatedField, self).__init__(*args, **kwargs)
|
|
|
|
|
|
class ManyHyperlinkedRelatedField(HyperlinkedRelatedField):
|
|
def __init__(self, *args, **kwargs):
|
|
warnings.warn('`ManyHyperlinkedRelatedField()` is deprecated. '
|
|
'Use `HyperlinkedRelatedField(many=True)` instead.',
|
|
DeprecationWarning, stacklevel=2)
|
|
kwargs['many'] = True
|
|
super(ManyHyperlinkedRelatedField, self).__init__(*args, **kwargs)
|