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DRF ViewSets supporting different settings for actions

Project description

DRF ViewSets supporting different settings for actions

Requirements

Django REST Framework 3.0+

Installation

Install using pip:

pip install drf-multiple-settings

Usage

drf-multiple-settings provides you with class GenericMultipleSettingsViewSet which is a subclass of DRF’s GenericViewSet with added support of different settings for actions.

This ViewSet does not contain any actions, so before you using it you should inherit this class adding mixins with desired actions (e.g. mixins.RetrieveModelMixin, mixins.ListModelMixin to add retrieve and list actions)

Instead of parametrize entire viewset with serializer_class, filterset_class, ordering_fields and ordering, you should give this parameters to each action. To do so, declare next dictionaries with keys equal action names.

Serializer settings

You must provide serializer_classes dictionary to configure serializers in views, using GenericMultipleSettingsViewSet. This dictionary is equivalent of GenericAPIView serializer_class field and it’s value should contain values of same type.

If serializer_classes is not provided or does not contain value for processed action ViewConfigurationError exception will be raised

Filters settings

If you wish to use different filtersets for different actions as well (which seems logical), your ViewSet should use filter backend from drf_multiple_settings.filter_backends package. As of now it contains only FilterBackend which overrides django_filters.rest_framework.DjangoFilterBackend and gives you access to filterset_classes dictionary. This dictionary is equivalent filterset_class field and it’s value should contain values of same type. For more information on filterset_class and django-filter visit django-filter documentation.

If you are using filtering backend which does not have implementation in drf_multiple_settings.filter_backends look at implementation for django-filter and write your own it’s pretty straightforward. Feel free to contact me at github so I can include your implementation of other FilterBackend in package.

Ordering settings

If you wish to use different ordering setting for different actions as well (which also seems logical), your ViewSet should use MultipleSettingsOrderingFilter which gives you access to this dictionaries:

  • Ordering fields dictionary: ordering_fields_set
  • Default ordering dictionary: ordering_set

Each dictionary value should have type of corresponding normal GenericAPIView parameters. See Django REST Framework documentation if you unsure what it is.

get_response method

GenericMultipleSettingsViewSet also provides get_response method for rendering response from action using whatever data you wish using current action’s settings.

def get_response(self, data, many):

This method gets QuerySet from data parameter paginate it if needed, then serialize it using serializer, set to this action and return serialized data as Response. Parameter many tells serializer if it should serialize more then one element. Example of using this method can be found in Example section.

Method designed to be used inside an action-decorated methods. Usage outside actions was not tested.

ModelViewSet and ReadonlyModelViewSet

DRF provides two default ViewSets:

  • ModelViewSet for CRUD operations with model
  • ReadOnlyModelViewSet for read operations with model (list and retrieve actions)

To ease it’s usage drf-multiple-settings provides GenericMultipleSettingsViewSet subclasses with same functionality:

  • ModelMultipleSettingsViewSet
  • ReadOnlyModelMultipleSettingsViewSet

Example

For this example we assume that we have following:

  • Two models Title and Issue
  • Three serializers
    • TitleListSerializer - serializer with main info about title
    • TitleDetailDerializer - serializer with detail info about title
    • IssueListSerializer
  • Two FilterSet classes
    • TitleFilter - title filters
    • IssueFilter - issue filters

And we wish create readonly API with following url structure

  • /title/ - list of all titles
  • /title/{id} - detail info of title with id={id}
  • /title/{id}/issues - list of all issues of title with id={id}

Additionally we want to allow sorting titles by name and issues by name, number and publish_date with default ordering on name ascending and publish_date descending accordingly and allow user to filter results using corresponding FilterSet classes.

We can use drf-multiple-settings to implement this API as follows (views.py):

from django.shortcuts import get_object_or_404
from drf_multiple_settings.filter_backends.django_filters import FilterBackend
from drf_multiple_settings.viewsets import ReadOnlyModelMultipleSettingsViewSet, MultipleSettingsOrderingFilter
from rest_framework.decorators import action

# ... Models and serializers imports...

class TitleViewSet(ComicsDBBaseViewSet):
    queryset = models.Title.objects.all()
    filter_backends = (MultipleSettingsOrderingFilter, FilterBackend,)

    # Serializers
    serializer_classes = {
        'list': TitleListSerializer,
        'retrieve': TitleDetailSerializer,
        'issues': IssueListSerializer
    }

    # FilterSets
    filterset_classes = {
        'list': TitleFilter,
        'issues': IssueFilter
    }

    # Ordering Parameters
    ordering_fields_set = {
        'list': ("name",),
        'issues': ("name", "number", "publish_date")
    }
    ordering_set = {
        'list': ("name", ),
        'issues': ("-publish_date", ),
    }

    @action(detail=True) # detail = True needed so DRF router include {id} in url
    def issues(self, request, pk):
        title = get_object_or_404(models.Title, pk=pk)
        titles = title.issues.all()
        titles = self.filter_queryset(titles)
        return self.get_response(titles, True)

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