mirror of
https://github.com/encode/django-rest-framework.git
synced 2024-11-11 12:17:24 +03:00
130 lines
4.3 KiB
Python
130 lines
4.3 KiB
Python
"""
|
|
Basic building blocks for generic class based views.
|
|
|
|
We don't bind behaviour to http method handlers yet,
|
|
which allows mixin classes to be composed in interesting ways.
|
|
"""
|
|
from django.http import Http404
|
|
from rest_framework import status
|
|
from rest_framework.response import Response
|
|
|
|
|
|
class CreateModelMixin(object):
|
|
"""
|
|
Create a model instance.
|
|
Should be mixed in with any `BaseView`.
|
|
"""
|
|
def create(self, request, *args, **kwargs):
|
|
serializer = self.get_serializer(data=request.DATA, files=request.FILES)
|
|
if serializer.is_valid():
|
|
self.pre_save(serializer.object)
|
|
self.object = serializer.save()
|
|
headers = self.get_success_headers(serializer.data)
|
|
return Response(serializer.data, status=status.HTTP_201_CREATED, headers=headers)
|
|
return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)
|
|
|
|
def get_success_headers(self, data):
|
|
try:
|
|
return {'Location': data['url']}
|
|
except (TypeError, KeyError):
|
|
return {}
|
|
|
|
def pre_save(self, obj):
|
|
pass
|
|
|
|
|
|
class ListModelMixin(object):
|
|
"""
|
|
List a queryset.
|
|
Should be mixed in with `MultipleObjectAPIView`.
|
|
"""
|
|
empty_error = u"Empty list and '%(class_name)s.allow_empty' is False."
|
|
|
|
def list(self, request, *args, **kwargs):
|
|
queryset = self.get_queryset()
|
|
self.object_list = self.filter_queryset(queryset)
|
|
|
|
# Default is to allow empty querysets. This can be altered by setting
|
|
# `.allow_empty = False`, to raise 404 errors on empty querysets.
|
|
allow_empty = self.get_allow_empty()
|
|
if not allow_empty and not self.object_list:
|
|
class_name = self.__class__.__name__
|
|
error_msg = self.empty_error % {'class_name': class_name}
|
|
raise Http404(error_msg)
|
|
|
|
# Pagination size is set by the `.paginate_by` attribute,
|
|
# which may be `None` to disable pagination.
|
|
page_size = self.get_paginate_by(self.object_list)
|
|
if page_size:
|
|
packed = self.paginate_queryset(self.object_list, page_size)
|
|
paginator, page, queryset, is_paginated = packed
|
|
serializer = self.get_pagination_serializer(page)
|
|
else:
|
|
serializer = self.get_serializer(self.object_list)
|
|
|
|
return Response(serializer.data)
|
|
|
|
|
|
class RetrieveModelMixin(object):
|
|
"""
|
|
Retrieve a model instance.
|
|
Should be mixed in with `SingleObjectBaseView`.
|
|
"""
|
|
def retrieve(self, request, *args, **kwargs):
|
|
self.object = self.get_object()
|
|
serializer = self.get_serializer(self.object)
|
|
return Response(serializer.data)
|
|
|
|
|
|
class UpdateModelMixin(object):
|
|
"""
|
|
Update a model instance.
|
|
Should be mixed in with `SingleObjectBaseView`.
|
|
"""
|
|
def update(self, request, *args, **kwargs):
|
|
try:
|
|
self.object = self.get_object()
|
|
created = False
|
|
except Http404:
|
|
self.object = None
|
|
created = True
|
|
|
|
serializer = self.get_serializer(self.object, data=request.DATA, files=request.FILES)
|
|
|
|
if serializer.is_valid():
|
|
self.pre_save(serializer.object)
|
|
self.object = serializer.save()
|
|
status_code = created and status.HTTP_201_CREATED or status.HTTP_200_OK
|
|
return Response(serializer.data, status=status_code)
|
|
|
|
return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)
|
|
|
|
def pre_save(self, obj):
|
|
"""
|
|
Set any attributes on the object that are implicit in the request.
|
|
"""
|
|
# pk and/or slug attributes are implicit in the URL.
|
|
pk = self.kwargs.get(self.pk_url_kwarg, None)
|
|
if pk:
|
|
setattr(obj, 'pk', pk)
|
|
|
|
slug = self.kwargs.get(self.slug_url_kwarg, None)
|
|
if slug:
|
|
slug_field = self.get_slug_field()
|
|
setattr(obj, slug_field, slug)
|
|
|
|
# Ensure we clean the attributes so that we don't eg return integer
|
|
# pk using a string representation, as provided by the url conf kwarg.
|
|
obj.full_clean()
|
|
|
|
|
|
class DestroyModelMixin(object):
|
|
"""
|
|
Destroy a model instance.
|
|
Should be mixed in with `SingleObjectBaseView`.
|
|
"""
|
|
def destroy(self, request, *args, **kwargs):
|
|
obj = self.get_object()
|
|
obj.delete()
|
|
return Response(status=status.HTTP_204_NO_CONTENT)
|