mirror of
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refactored GenericRelatedField with dict argument as discussed here: https://github.com/tomchristie/django-rest-framework/pull/755
This commit is contained in:
lukasbuenger
parent
850e696608
commit
b894b3c15d
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@ -1,197 +1,50 @@
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"""
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# Generic relations
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## Introduction
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This is an attempt to implement generic relation foreign keys as provided by Django's
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[contenttype framework](https://docs.djangoproject.com/en/dev/ref/contrib/contenttypes/) and I tried to follow the
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suggestions and requirements described here:
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* https://github.com/tomchristie/django-rest-framework/issues/606
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* http://stackoverflow.com/a/14454629/1326146
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The `GenericRelatedField` field enables you to read and write `GenericForeignKey`s within the scope of Django REST
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Framework. While you can decide whether to output `GenericForeignKey`s as nested objects (`ModelSerializer`) or valid
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resource URLs (`HyperlinkedRelatedField`), the input is restricted to resource URLs mainly because of two reasons:
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* The sheer impossibility of deriving a valid `Model` class from a simple data dictionary.
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* My inner storm of indignation when thinking of exposing the actual `ContentType`s to the public scope.
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## Disclaimer
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Although I'm pretty experienced with Django and REST etc, please note that this piece of code is also my first
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experience with Django REST framework at all. I am the maintainer of a pretty large REST service application based on
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[tastypie](tastypieapi.org), but Daniel's recent
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[blog post](http://toastdriven.com/blog/2013/feb/05/committers-needed-tastypie-haystack/) made me feel a little
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uncomfortable. As much I'd like to spend more time contributing, I fear that my current work-life balance doesn't allow
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me to do so at the level I'd expect from myself. So I thought it would be a good thing to reach out for other solutions.
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It's a good thing anyway, I guess. But a sane and approved way of representing `GenericForeignKeys` is just essential to
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the data structure I'm working with. So that's basically why I got in the mix.
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## Minimalist example
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This is based on the models mentioned in
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[this article](http://django-rest-framework.org/api-guide/relations.html#generic-relationships). The examples are also
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based on working URL patterns for each model fitting the pattern `<model_lowercase>-detail`.
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A minimalist but still working example of a `TagSerializer` with `GenericRelatedField` would look like this:
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class TagSerializer(serializers.ModelSerializer):
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tagged_item = GenericRelatedField([
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GenericRelationOption(Bookmark, 'bookmark-detail'),
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GenericRelationOption(Note, 'note-detail'),
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], source='tagged_item')
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class Meta:
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model = Tag
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exclude = ('id', 'content_type', 'object_id', )
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## ``GenericRelationOption``
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Constructor:
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GenericRelationOption(model, view_name, as_hyperlink=True, related_field=None, serializer=None)
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**`model`**
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The model class.
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**`view_name`**
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The view name as used in url patterns.
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**`as_hyperlink`**
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Decides whether the output of the `GenericForeignKey` should be as end point or nested object. In the case of the
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latter a generic serializer will be used unless you pass a specific one.
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**`related_field`**
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A specific subclass of `HyperlinkedRelatedField` that should be used for resolving input data and resolving output data
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in case of `as_hyperlink` is `True`.
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**`serializer`**
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A specific subclass of `ModelSerializer` that should be used for resolving output data
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in case of `as_hyperlink` is `True`.
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"""
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from __future__ import unicode_literals
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from django.core.exceptions import ValidationError
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from django.core.urlresolvers import get_script_prefix, resolve
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from django.utils.translation import ugettext_lazy as _
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from django import forms
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from rest_framework.compat import urlparse
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from rest_framework import six
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from rest_framework import serializers
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from rest_framework.settings import api_settings
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class GenericRelationOption(object):
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"""
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This object is responsible for setting up the components needed for providing a generic relation with a given model.
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"""
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#TODO: Far more strict evaluation of custom related_field and serializer objects
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# Trying to be inline with common practices
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model_serializer_class = api_settings.DEFAULT_MODEL_SERIALIZER_CLASS
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def __init__(self, model, view_name, as_hyperlink=True, related_field=None, serializer=None):
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self.model = model
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self.view_name = view_name
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self.as_hyperlink = as_hyperlink
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self.related_field = related_field or self.get_default_related_field()
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self.serializer = serializer or self.get_default_serializer()
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def get_output_resolver(self):
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"""
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Should return a class that implements the `to_native` method, i.e. `HyperlinkedRelatedField` or `ModelSerializer`.
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"""
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if self.as_hyperlink:
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return self.get_prepared_related_field()
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else:
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return self.serializer
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def get_input_resolver(self):
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"""
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Should return a class that implements the `from_native` method that can handle URL values,
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i.e. `HyperlinkedRelatedField`.
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"""
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return self.get_prepared_related_field()
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def get_prepared_related_field(self):
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"""
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Provides the related field with a queryset if not present, based on `self.model`.
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"""
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if self.related_field.queryset is None:
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self.related_field.queryset = self.model.objects.all()
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return self.related_field
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def get_default_related_field(self):
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"""
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Creates and returns a minimalist ``HyperlinkedRelatedField` instance if none has been passed to the constructor.
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"""
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return serializers.HyperlinkedRelatedField(view_name=self.view_name)
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def get_default_serializer(self):
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"""
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Creates and returns a minimalist ``ModelSerializer` instance if none has been passed to the constructor.
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"""
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class DefaultSerializer(self.model_serializer_class):
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class Meta:
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model = self.model
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return DefaultSerializer()
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from rest_framework.exceptions import ConfigurationError
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class GenericRelatedField(serializers.WritableField):
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"""
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Represents a generic relation foreign key.
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It's actually more of a wrapper, that delegates the logic to registered fields / serializers based on some
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contenttype framework criteria.
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It's actually more of a wrapper, that delegates the logic to registered serializers based on the `Model` class.
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"""
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default_error_messages = {
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'no_model_match': _('Invalid model - model not available.'),
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'no_match': _('Invalid hyperlink - No URL match'),
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'incorrect_match': _('Invalid hyperlink - view name not available'),
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'no_url_match': _('Invalid hyperlink - No URL match'),
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'incorrect_url_match': _('Invalid hyperlink - view name not available'),
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}
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form_field_class = forms.URLField
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def __init__(self, options, *args, **kwargs):
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def __init__(self, serializers, *args, **kwargs):
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"""
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Needs an extra parameter ``options`` which has to be a list of `GenericRelationOption` objects.
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Needs an extra parameter `serializers` which has to be a dict key: value being `Model`: serializer.
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"""
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super(GenericRelatedField, self).__init__(*args, **kwargs)
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# Map for option identifying based on a `Model` class (deserialization cycle)
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self._model_map = dict()
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# Map for option identifying based on a `view_name` (serialization cycle)
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self._view_name_map = dict()
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# Adding the options to the maps.
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for option in options:
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self._model_map[option.model] = option
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self._view_name_map[option.view_name] = option
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self.serializers = serializers
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for model, serializer in six.iteritems(self.serializers):
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# We have to do it, because the serializer can't access a explicit manager through the
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# GenericForeignKey field on the model.
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if hasattr(serializer, 'queryset') and serializer.queryset is None:
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serializer.queryset = model._default_manager.all()
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def field_to_native(self, obj, field_name):
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"""
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Identifies the option object that is responsible for this `value.__class__` (a model) object and returns
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its output serializer's `to_native` method.
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Delegates to the `to_native` method of the serializer registered under obj.__class__
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"""
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value = super(GenericRelatedField, self).field_to_native(obj, field_name)
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# Retrieving the model class.
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model = value.__class__
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try:
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option = self._model_map[model]
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except KeyError:
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raise ValidationError(self.error_messages['no_model_match'])
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# Get the serializer responsible for output formatting
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serializer = option.get_output_resolver()
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serializer = self.determine_deserializer_for_data(value)
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# Necessary because of context, field resolving etc.
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serializer.initialize(self.parent, field_name)
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return serializer.to_native(value)
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def to_native(self, value):
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@ -199,6 +52,24 @@ class GenericRelatedField(serializers.WritableField):
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return value
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def from_native(self, value):
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# Get the serializer responsible for input resolving
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serializer = self.determine_serializer_for_data(value)
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serializer.initialize(self.parent, self.source)
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return serializer.from_native(value)
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def determine_deserializer_for_data(self, value):
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try:
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model = value.__class__
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serializer = self.serializers[model]
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except KeyError:
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raise ValidationError(self.error_messages['no_model_match'])
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return serializer
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def determine_serializer_for_data(self, value):
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for serializer in six.itervalues(self.serializers):
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if not isinstance(serializer, serializers.HyperlinkedRelatedField):
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raise ConfigurationError('Please use HyperlinkedRelatedField as serializers on GenericRelatedField \
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instances with read_only=False or set read_only=True.')
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# This excerpt is an exact copy of ``rest_framework.relations.HyperlinkedRelatedField``, Line 363
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# From here until ...
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@ -217,20 +88,15 @@ class GenericRelatedField(serializers.WritableField):
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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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raise ValidationError(self.error_messages['no_url_match'])
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# ... here. Thinking about putting that in ``rest_framework.utils.py``. Of course With more appropriate exceptions.
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# ... here
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# Try to find the derived `view_name` in the map.
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try:
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view_name = match.url_name
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option = self._view_name_map[view_name]
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except KeyError:
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raise ValidationError(self.error_messages['incorrect_match'])
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matched_serializer = None
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for serializer in six.itervalues(self.serializers):
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if serializer.view_name == match.url_name:
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matched_serializer = serializer
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# Get the serializer responsible for input resolving
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serializer = option.get_input_resolver()
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# Necessary because of context, field resolving etc.
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serializer.initialize(self.parent, self.source)
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return serializer.from_native(value)
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if matched_serializer is None:
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raise ValidationError(self.error_messages['incorrect_url_match'])
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return matched_serializer
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@ -1,12 +1,14 @@
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from __future__ import unicode_literals
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from django.contrib.contenttypes.models import ContentType
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from django.contrib.contenttypes.generic import GenericRelation, GenericForeignKey
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from django.core.exceptions import ValidationError
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from django.db import models
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from django.test import TestCase, RequestFactory
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from rest_framework import serializers
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from rest_framework.compat import patterns, url
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from rest_framework.genericrelations import GenericRelationOption, GenericRelatedField
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from rest_framework.exceptions import ConfigurationError
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from rest_framework.genericrelations import GenericRelatedField
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from rest_framework.reverse import reverse
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factory = RequestFactory()
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@ -58,75 +60,19 @@ class Note(models.Model):
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return 'Note: %s' % self.text
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class Contact(models.Model):
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"""
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A textual note that may have multiple tags attached.
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"""
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name = models.TextField()
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slug = models.SlugField()
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tags = GenericRelation(Tag)
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def __unicode__(self):
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return 'Contact: %s' % self.name
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class TestGenericRelationOptions(TestCase):
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def test_default_related_field(self):
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option = GenericRelationOption(Bookmark, 'bookmark-detail')
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self.assertIsInstance(option.related_field, serializers.HyperlinkedRelatedField)
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def test_default_related_field_view_name(self):
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option = GenericRelationOption(Bookmark, 'bookmark-detail')
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self.assertEqual(option.related_field.view_name, 'bookmark-detail')
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def test_default_serializer(self):
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option = GenericRelationOption(Bookmark, 'bookmark-detail')
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self.assertIsInstance(option.serializer, serializers.ModelSerializer)
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def test_default_serializer_meta_model(self):
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option = GenericRelationOption(Bookmark, 'bookmark-detail')
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self.assertEqual(option.serializer.Meta.model, Bookmark)
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def test_get_url_output_resolver(self):
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option = GenericRelationOption(Bookmark, 'bookmark-detail')
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self.assertIsInstance(option.get_output_resolver(), serializers.HyperlinkedRelatedField)
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def test_get_url_output_resolver_with_queryset(self):
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option = GenericRelationOption(Bookmark, 'bookmark-detail')
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self.assertIsNotNone(option.get_output_resolver().queryset)
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def test_get_input_resolver(self):
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option = GenericRelationOption(Bookmark, 'bookmark-detail')
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self.assertIsInstance(option.get_input_resolver(), serializers.HyperlinkedRelatedField)
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def test_get_input_resolver_with_queryset(self):
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option = GenericRelationOption(Bookmark, 'bookmark-detail')
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self.assertIsNotNone(option.get_output_resolver().queryset)
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def test_get_serializer_resolver(self):
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option = GenericRelationOption(Bookmark, 'bookmark-detail', as_hyperlink=False)
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self.assertIsInstance(option.get_output_resolver(), serializers.ModelSerializer)
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def test_custom_related_field(self):
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related_field = serializers.HyperlinkedRelatedField(view_name='bookmark-detail', format='xml')
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option = GenericRelationOption(Bookmark, 'bookmark-detail',
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related_field=related_field)
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self.assertEqual(option.related_field.format, 'xml')
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def test_custom_serializer(self):
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class BookmarkSerializer(serializers.ModelSerializer):
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class BookmarkSerializer(serializers.ModelSerializer):
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class Meta:
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model = Bookmark
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exclude = ('id', )
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serializer = BookmarkSerializer()
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option = GenericRelationOption(Bookmark, 'bookmark-detail', as_hyperlink=False, serializer=serializer)
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self.assertIn('id', option.get_output_resolver().Meta.exclude)
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class NoteSerializer(serializers.ModelSerializer):
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class Meta:
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model = Note
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exclude = ('id', )
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class TestGenericRelatedFieldToNative(TestCase):
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class TestGenericRelatedFieldDeserialization(TestCase):
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urls = 'rest_framework.tests.relations_generic'
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@ -140,10 +86,10 @@ class TestGenericRelatedFieldToNative(TestCase):
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def test_relations_as_hyperlinks(self):
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class TagSerializer(serializers.ModelSerializer):
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tagged_item = GenericRelatedField([
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GenericRelationOption(Bookmark, 'bookmark-detail'),
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GenericRelationOption(Note, 'note-detail'),
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], source='tagged_item')
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tagged_item = GenericRelatedField({
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Bookmark: serializers.HyperlinkedRelatedField(view_name='bookmark-detail'),
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Note: serializers.HyperlinkedRelatedField(view_name='note-detail'),
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}, source='tagged_item', read_only=True)
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class Meta:
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model = Tag
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@ -169,10 +115,10 @@ class TestGenericRelatedFieldToNative(TestCase):
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def test_relations_as_nested(self):
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class TagSerializer(serializers.ModelSerializer):
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tagged_item = GenericRelatedField([
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GenericRelationOption(Bookmark, 'bookmark-detail'),
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GenericRelationOption(Note, 'note-detail', as_hyperlink=False),
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], source='tagged_item')
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tagged_item = GenericRelatedField({
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Bookmark: BookmarkSerializer(),
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Note: NoteSerializer(),
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}, source='tagged_item', read_only=True)
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class Meta:
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model = Tag
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@ -181,16 +127,19 @@ class TestGenericRelatedFieldToNative(TestCase):
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serializer = TagSerializer(Tag.objects.all(), many=True)
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expected = [
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{
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'tagged_item': '/bookmark/1/',
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'tagged_item': {
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'url': 'https://www.djangoproject.com/'
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},
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'tag': 'django'
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},
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{
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'tagged_item': '/bookmark/1/',
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'tagged_item': {
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'url': 'https://www.djangoproject.com/'
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},
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'tag': 'python'
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},
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{
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'tagged_item': {
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'id': 1,
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'text': 'Remember the milk',
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},
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'tag': 'reminder'
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@ -198,19 +147,12 @@ class TestGenericRelatedFieldToNative(TestCase):
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]
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self.assertEqual(serializer.data, expected)
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def test_custom_related_field(self):
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contact = Contact.objects.create(name='Lukas Buenger', slug='lukas-buenger')
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Tag.objects.create(tagged_item=contact, tag='developer')
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contact_related_field = serializers.HyperlinkedRelatedField(view_name='contact-detail',
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slug_url_kwarg='my_own_slug')
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def test_mixed_serializers(self):
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class TagSerializer(serializers.ModelSerializer):
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tagged_item = GenericRelatedField([
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GenericRelationOption(Bookmark, 'bookmark-detail'),
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GenericRelationOption(Note, 'note-detail', as_hyperlink=False),
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GenericRelationOption(Contact, 'contact-detail', related_field=contact_related_field),
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], source='tagged_item')
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tagged_item = GenericRelatedField({
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Bookmark: BookmarkSerializer(),
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Note: serializers.HyperlinkedRelatedField(view_name='note-detail'),
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}, source='tagged_item', read_only=True)
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class Meta:
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model = Tag
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|
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@ -219,80 +161,42 @@ class TestGenericRelatedFieldToNative(TestCase):
|
|||
serializer = TagSerializer(Tag.objects.all(), many=True)
|
||||
expected = [
|
||||
{
|
||||
'tagged_item': '/bookmark/1/',
|
||||
'tagged_item': {
|
||||
'url': 'https://www.djangoproject.com/'
|
||||
},
|
||||
'tag': 'django'
|
||||
},
|
||||
{
|
||||
'tagged_item': '/bookmark/1/',
|
||||
'tagged_item': {
|
||||
'url': 'https://www.djangoproject.com/'
|
||||
},
|
||||
'tag': 'python'
|
||||
},
|
||||
{
|
||||
'tagged_item': {
|
||||
'id': 1,
|
||||
'text': 'Remember the milk',
|
||||
},
|
||||
'tagged_item': '/note/1/',
|
||||
'tag': 'reminder'
|
||||
},
|
||||
{
|
||||
'tagged_item': '/contact/lukas-buenger/',
|
||||
'tag': 'developer'
|
||||
}
|
||||
]
|
||||
self.assertEqual(serializer.data, expected)
|
||||
|
||||
def test_custom_serializer(self):
|
||||
contact = Contact.objects.create(name='Lukas Buenger', slug='lukas-buenger')
|
||||
Tag.objects.create(tagged_item=contact, tag='developer')
|
||||
|
||||
contact_related_field = serializers.HyperlinkedRelatedField(view_name='contact-detail',
|
||||
slug_url_kwarg='my_own_slug')
|
||||
|
||||
class ContactSerializer(serializers.ModelSerializer):
|
||||
class Meta:
|
||||
model = Contact
|
||||
exclude = ('id', 'slug', )
|
||||
|
||||
|
||||
def test_invalid_model(self):
|
||||
# Leaving out the Note model should result in a ValidationError
|
||||
class TagSerializer(serializers.ModelSerializer):
|
||||
tagged_item = GenericRelatedField([
|
||||
GenericRelationOption(Bookmark, 'bookmark-detail'),
|
||||
GenericRelationOption(Note, 'note-detail', as_hyperlink=False),
|
||||
GenericRelationOption(Contact, 'contact-detail', as_hyperlink=False, related_field=contact_related_field,
|
||||
serializer=ContactSerializer()),
|
||||
], source='tagged_item')
|
||||
tagged_item = GenericRelatedField({
|
||||
Bookmark: BookmarkSerializer(),
|
||||
}, source='tagged_item', read_only=True)
|
||||
|
||||
class Meta:
|
||||
model = Tag
|
||||
exclude = ('id', 'content_type', 'object_id', )
|
||||
|
||||
serializer = TagSerializer(Tag.objects.all(), many=True)
|
||||
expected = [
|
||||
{
|
||||
'tagged_item': '/bookmark/1/',
|
||||
'tag': 'django'
|
||||
},
|
||||
{
|
||||
'tagged_item': '/bookmark/1/',
|
||||
'tag': 'python'
|
||||
},
|
||||
{
|
||||
'tagged_item': {
|
||||
'id': 1,
|
||||
'text': 'Remember the milk',
|
||||
},
|
||||
'tag': 'reminder'
|
||||
},
|
||||
{
|
||||
'tagged_item': {
|
||||
'name': 'Lukas Buenger'
|
||||
},
|
||||
'tag': 'developer'
|
||||
}
|
||||
]
|
||||
self.assertEqual(serializer.data, expected)
|
||||
|
||||
def call_data():
|
||||
return serializer.data
|
||||
self.assertRaises(ValidationError, call_data)
|
||||
|
||||
|
||||
class TestGenericRelatedFieldFromNative(TestCase):
|
||||
class TestGenericRelatedFieldSerialization(TestCase):
|
||||
|
||||
urls = 'rest_framework.tests.relations_generic'
|
||||
|
||||
|
|
@ -302,13 +206,12 @@ class TestGenericRelatedFieldFromNative(TestCase):
|
|||
Tag.objects.create(tagged_item=self.bookmark, tag='python')
|
||||
self.note = Note.objects.create(text='Remember the milk')
|
||||
|
||||
def test_default(self):
|
||||
|
||||
def test_hyperlink_serialization(self):
|
||||
class TagSerializer(serializers.ModelSerializer):
|
||||
tagged_item = GenericRelatedField([
|
||||
GenericRelationOption(Bookmark, 'bookmark-detail'),
|
||||
GenericRelationOption(Note, 'note-detail'),
|
||||
], source='tagged_item')
|
||||
tagged_item = GenericRelatedField({
|
||||
Bookmark: serializers.HyperlinkedRelatedField(view_name='bookmark-detail'),
|
||||
Note: serializers.HyperlinkedRelatedField(view_name='note-detail'),
|
||||
}, source='tagged_item', read_only=False)
|
||||
|
||||
class Meta:
|
||||
model = Tag
|
||||
|
|
@ -318,10 +221,82 @@ class TestGenericRelatedFieldFromNative(TestCase):
|
|||
'tag': 'reminder',
|
||||
'tagged_item': reverse('note-detail', kwargs={'pk': self.note.pk})
|
||||
})
|
||||
|
||||
serializer.is_valid()
|
||||
expected = {
|
||||
'tagged_item': '/note/1/',
|
||||
'tag': 'reminder'
|
||||
}
|
||||
self.assertEqual(serializer.data, expected)
|
||||
|
||||
def test_configuration_error(self):
|
||||
class TagSerializer(serializers.ModelSerializer):
|
||||
tagged_item = GenericRelatedField({
|
||||
Bookmark: BookmarkSerializer(),
|
||||
Note: serializers.HyperlinkedRelatedField(view_name='note-detail'),
|
||||
}, source='tagged_item', read_only=False)
|
||||
|
||||
class Meta:
|
||||
model = Tag
|
||||
exclude = ('id', 'content_type', 'object_id', )
|
||||
|
||||
serializer = TagSerializer(data={
|
||||
'tag': 'reminder',
|
||||
'tagged_item': reverse('note-detail', kwargs={'pk': self.note.pk})
|
||||
})
|
||||
self.assertRaises(ConfigurationError, serializer.is_valid)
|
||||
|
||||
def test_not_registered_view_name(self):
|
||||
class TagSerializer(serializers.ModelSerializer):
|
||||
tagged_item = GenericRelatedField({
|
||||
Bookmark: serializers.HyperlinkedRelatedField(view_name='bookmark-detail'),
|
||||
}, source='tagged_item', read_only=False)
|
||||
|
||||
class Meta:
|
||||
model = Tag
|
||||
exclude = ('id', 'content_type', 'object_id', )
|
||||
|
||||
serializer = TagSerializer(data={
|
||||
'tag': 'reminder',
|
||||
'tagged_item': reverse('note-detail', kwargs={'pk': self.note.pk})
|
||||
})
|
||||
self.assertFalse(serializer.is_valid())
|
||||
|
||||
def test_invalid_url(self):
|
||||
class TagSerializer(serializers.ModelSerializer):
|
||||
tagged_item = GenericRelatedField({
|
||||
Bookmark: serializers.HyperlinkedRelatedField(view_name='bookmark-detail'),
|
||||
}, source='tagged_item', read_only=False)
|
||||
|
||||
class Meta:
|
||||
model = Tag
|
||||
exclude = ('id', 'content_type', 'object_id', )
|
||||
|
||||
serializer = TagSerializer(data={
|
||||
'tag': 'reminder',
|
||||
'tagged_item': 'foo-bar'
|
||||
})
|
||||
self.assertFalse(serializer.is_valid())
|
||||
|
||||
def test_serializer_save(self):
|
||||
class TagSerializer(serializers.ModelSerializer):
|
||||
tagged_item = GenericRelatedField({
|
||||
Bookmark: serializers.HyperlinkedRelatedField(view_name='bookmark-detail'),
|
||||
Note: serializers.HyperlinkedRelatedField(view_name='note-detail'),
|
||||
}, source='tagged_item', read_only=False)
|
||||
|
||||
class Meta:
|
||||
model = Tag
|
||||
exclude = ('id', 'content_type', 'object_id', )
|
||||
|
||||
serializer = TagSerializer(data={
|
||||
'tag': 'reminder',
|
||||
'tagged_item': reverse('note-detail', kwargs={'pk': self.note.pk})
|
||||
})
|
||||
serializer.is_valid()
|
||||
expected = {
|
||||
'tagged_item': '/note/1/',
|
||||
'tag': 'reminder'
|
||||
}
|
||||
serializer.save()
|
||||
tag = Tag.objects.get(pk=3)
|
||||
self.assertEqual(tag.tagged_item, self.note)
|
||||
Loading…
Reference in New Issue
Block a user