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123 lines
4.0 KiB
Python
123 lines
4.0 KiB
Python
"""
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Basic building blocks for generic class based views.
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We don't bind behaviour to http method handlers yet,
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which allows mixin classes to be composed in interesting ways.
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"""
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from django.http import Http404
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from rest_framework import status
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from rest_framework.response import Response
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class CreateModelMixin(object):
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"""
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Create a model instance.
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Should be mixed in with any `BaseView`.
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"""
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def create(self, request, *args, **kwargs):
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serializer = self.get_serializer(data=request.DATA)
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if serializer.is_valid():
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self.pre_save(serializer.object)
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self.object = serializer.save()
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headers = self.get_success_headers(serializer.data)
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return Response(serializer.data, status=status.HTTP_201_CREATED, headers=headers)
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return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)
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def get_success_headers(self, data):
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if 'url' in data:
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return {'Location': data.get('url')}
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else:
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return {}
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def pre_save(self, obj):
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pass
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class ListModelMixin(object):
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"""
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List a queryset.
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Should be mixed in with `MultipleObjectAPIView`.
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"""
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empty_error = u"Empty list and '%(class_name)s.allow_empty' is False."
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def list(self, request, *args, **kwargs):
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self.object_list = self.get_filtered_queryset()
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# Default is to allow empty querysets. This can be altered by setting
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# `.allow_empty = False`, to raise 404 errors on empty querysets.
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allow_empty = self.get_allow_empty()
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if not allow_empty and len(self.object_list) == 0:
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error_args = {'class_name': self.__class__.__name__}
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raise Http404(self.empty_error % error_args)
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# Pagination size is set by the `.paginate_by` attribute,
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# which may be `None` to disable pagination.
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page_size = self.get_paginate_by(self.object_list)
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if page_size:
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packed = self.paginate_queryset(self.object_list, page_size)
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paginator, page, queryset, is_paginated = packed
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serializer = self.get_pagination_serializer(page)
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else:
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serializer = self.get_serializer(self.object_list)
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return Response(serializer.data)
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class RetrieveModelMixin(object):
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"""
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Retrieve a model instance.
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Should be mixed in with `SingleObjectBaseView`.
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"""
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def retrieve(self, request, *args, **kwargs):
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self.object = self.get_object()
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serializer = self.get_serializer(self.object)
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return Response(serializer.data)
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class UpdateModelMixin(object):
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"""
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Update a model instance.
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Should be mixed in with `SingleObjectBaseView`.
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"""
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def update(self, request, *args, **kwargs):
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try:
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self.object = self.get_object()
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success_status = status.HTTP_200_OK
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except Http404:
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self.object = None
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success_status = status.HTTP_201_CREATED
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serializer = self.get_serializer(self.object, data=request.DATA)
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if serializer.is_valid():
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self.pre_save(serializer.object)
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self.object = serializer.save()
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return Response(serializer.data, status=success_status)
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return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)
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def pre_save(self, obj):
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"""
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Set any attributes on the object that are implicit in the request.
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"""
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# pk and/or slug attributes are implicit in the URL.
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pk = self.kwargs.get(self.pk_url_kwarg, None)
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if pk:
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setattr(obj, 'pk', pk)
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slug = self.kwargs.get(self.slug_url_kwarg, None)
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if slug:
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slug_field = self.get_slug_field()
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setattr(obj, slug_field, slug)
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class DestroyModelMixin(object):
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"""
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Destroy a model instance.
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Should be mixed in with `SingleObjectBaseView`.
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"""
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def destroy(self, request, *args, **kwargs):
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self.object = self.get_object()
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self.object.delete()
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return Response(status=status.HTTP_204_NO_CONTENT)
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