238 lines
12 KiB
Python
238 lines
12 KiB
Python
import inspect
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import logging
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from collections import OrderedDict
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from rest_framework import serializers, status
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from rest_framework.mixins import DestroyModelMixin, RetrieveModelMixin, UpdateModelMixin
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logger = logging.getLogger(__name__)
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#: used to forcibly remove the body of a request via :func:`.swagger_auto_schema`
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no_body = object()
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def swagger_auto_schema(method=None, methods=None, auto_schema=None, request_body=None, query_serializer=None,
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manual_parameters=None, operation_id=None, operation_description=None, responses=None,
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field_inspectors=None, filter_inspectors=None, paginator_inspectors=None,
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**extra_overrides):
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"""Decorate a view method to customize the :class:`.Operation` object generated from it.
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`method` and `methods` are mutually exclusive and must only be present when decorating a view method that accepts
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more than one HTTP request method.
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The `auto_schema` and `operation_description` arguments take precendence over view- or method-level values.
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.. versionchanged:: 1.1
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Added the ``extra_overrides`` and ``operatiod_id`` parameters.
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.. versionchanged:: 1.1
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Added the ``field_inspectors``, ``filter_inspectors`` and ``paginator_inspectors`` parameters.
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:param str method: for multi-method views, the http method the options should apply to
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:param list[str] methods: for multi-method views, the http methods the options should apply to
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:param .inspectors.SwaggerAutoSchema auto_schema: custom class to use for generating the Operation object;
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this overrides both the class-level ``swagger_schema`` attribute and the ``DEFAULT_AUTO_SCHEMA_CLASS``
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setting
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:param .Schema,.SchemaRef,.Serializer request_body: custom request body, or :data:`.no_body`. The value given here
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will be used as the ``schema`` property of a :class:`.Parameter` with ``in: 'body'``.
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A Schema or SchemaRef is not valid if this request consumes form-data, because ``form`` and ``body`` parameters
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are mutually exclusive in an :class:`.Operation`. If you need to set custom ``form`` parameters, you can use
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the `manual_parameters` argument.
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If a ``Serializer`` class or instance is given, it will be automatically converted into a :class:`.Schema`
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used as a ``body`` :class:`.Parameter`, or into a list of ``form`` :class:`.Parameter`\ s, as appropriate.
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:param .Serializer query_serializer: if you use a ``Serializer`` to parse query parameters, you can pass it here
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and have :class:`.Parameter` objects be generated automatically from it.
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If any ``Field`` on the serializer cannot be represented as a ``query`` :class:`.Parameter`
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(e.g. nested Serializers, file fields, ...), the schema generation will fail with an error.
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Schema generation will also fail if the name of any Field on the `query_serializer` conflicts with parameters
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generated by ``filter_backends`` or ``paginator``.
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:param list[.Parameter] manual_parameters: a list of manual parameters to override the automatically generated ones
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:class:`.Parameter`\ s are identified by their (``name``, ``in``) combination, and any parameters given
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here will fully override automatically generated parameters if they collide.
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It is an error to supply ``form`` parameters when the request does not consume form-data.
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:param str operation_id: operation ID override; the operation ID must be unique accross the whole API
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:param str operation_description: operation description override
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:param dict[str,(.Schema,.SchemaRef,.Response,str,Serializer)] responses: a dict of documented manual responses
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keyed on response status code. If no success (``2xx``) response is given, one will automatically be
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generated from the request body and http method. If any ``2xx`` response is given the automatic response is
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suppressed.
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* if a plain string is given as value, a :class:`.Response` with no body and that string as its description
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will be generated
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* if a :class:`.Schema`, :class:`.SchemaRef` is given, a :class:`.Response` with the schema as its body and
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an empty description will be generated
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* a ``Serializer`` class or instance will be converted into a :class:`.Schema` and treated as above
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* a :class:`.Response` object will be used as-is; however if its ``schema`` attribute is a ``Serializer``,
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it will automatically be converted into a :class:`.Schema`
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:param list[.FieldInspector] field_inspectors: extra serializer and field inspectors; these will be tried
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before :attr:`.ViewInspector.field_inspectors` on the :class:`.inspectors.SwaggerAutoSchema` instance
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:param list[.FilterInspector] filter_inspectors: extra filter inspectors; these will be tried before
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:attr:`.ViewInspector.filter_inspectors` on the :class:`.inspectors.SwaggerAutoSchema` instance
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:param list[.PaginatorInspector] paginator_inspectors: extra paginator inspectors; these will be tried before
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:attr:`.ViewInspector.paginator_inspectors` on the :class:`.inspectors.SwaggerAutoSchema` instance
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:param extra_overrides: extra values that will be saved into the ``overrides`` dict; these values will be available
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in the handling :class:`.inspectors.SwaggerAutoSchema` instance via ``self.overrides``
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"""
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def decorator(view_method):
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data = {
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'auto_schema': auto_schema,
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'request_body': request_body,
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'query_serializer': query_serializer,
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'manual_parameters': manual_parameters,
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'operation_id': operation_id,
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'operation_description': operation_description,
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'responses': responses,
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'filter_inspectors': list(filter_inspectors) if filter_inspectors else None,
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'paginator_inspectors': list(paginator_inspectors) if paginator_inspectors else None,
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'field_inspectors': list(field_inspectors) if field_inspectors else None,
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}
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data = {k: v for k, v in data.items() if v is not None}
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data.update(extra_overrides)
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# if the method is a detail_route or list_route, it will have a bind_to_methods attribute
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bind_to_methods = getattr(view_method, 'bind_to_methods', [])
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# if the method is actually a function based view (@api_view), it will have a 'cls' attribute
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view_cls = getattr(view_method, 'cls', None)
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http_method_names = getattr(view_cls, 'http_method_names', [])
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if bind_to_methods or http_method_names:
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# detail_route, list_route or api_view
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assert bool(http_method_names) != bool(bind_to_methods), "this should never happen"
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available_methods = http_method_names + bind_to_methods
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existing_data = getattr(view_method, '_swagger_auto_schema', {})
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if http_method_names:
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_route = "api_view"
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else:
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_route = "detail_route" if view_method.detail else "list_route"
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_methods = methods
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if len(available_methods) > 1:
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assert methods or method, \
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"on multi-method %s, you must specify swagger_auto_schema on a per-method basis " \
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"using one of the `method` or `methods` arguments" % _route
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assert bool(methods) != bool(method), "specify either method or methods"
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assert not isinstance(methods, str), "`methods` expects to receive a list of methods;" \
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" use `method` for a single argument"
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if method:
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_methods = [method.lower()]
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else:
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_methods = [mth.lower() for mth in methods]
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assert not any(mth in existing_data for mth in _methods), "method defined multiple times"
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assert all(mth in available_methods for mth in _methods), "method not bound to %s" % _route
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existing_data.update((mth.lower(), data) for mth in _methods)
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else:
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existing_data[available_methods[0]] = data
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view_method._swagger_auto_schema = existing_data
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else:
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assert method is None and methods is None, \
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"the methods argument should only be specified when decorating a detail_route or list_route; you " \
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"should also ensure that you put the swagger_auto_schema decorator AFTER (above) the _route decorator"
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view_method._swagger_auto_schema = data
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return view_method
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return decorator
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def is_list_view(path, method, view):
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"""Check if the given path/method appears to represent a list view (as opposed to a detail/instance view).
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:param str path: view path
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:param str method: http method
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:param APIView view: target view
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:rtype: bool
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"""
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# for ViewSets, it could be the default 'list' action, or a list_route
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action = getattr(view, 'action', '')
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method = getattr(view, action, None)
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detail = getattr(method, 'detail', None)
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suffix = getattr(view, 'suffix', None)
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if action in ('list', 'create') or detail is False or suffix == 'List':
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return True
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if action in ('retrieve', 'update', 'partial_update', 'destroy') or detail is True or suffix == 'Instance':
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# a detail_route is surely not a list route
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return False
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# for GenericAPIView, if it's a detail view it can't also be a list view
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if isinstance(view, (RetrieveModelMixin, UpdateModelMixin, DestroyModelMixin)):
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return False
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# if the last component in the path is parameterized it's probably not a list view
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path_components = path.strip('/').split('/')
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if path_components and '{' in path_components[-1]:
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return False
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# otherwise assume it's a list view
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return True
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def guess_response_status(method):
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if method == 'post':
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return status.HTTP_201_CREATED
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elif method == 'delete':
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return status.HTTP_204_NO_CONTENT
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else:
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return status.HTTP_200_OK
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def param_list_to_odict(parameters):
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"""Transform a list of :class:`.Parameter` objects into an ``OrderedDict`` keyed on the ``(name, in_)`` tuple of
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each parameter.
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Raises an ``AssertionError`` if `parameters` contains duplicate parameters (by their name + in combination).
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:param list[.Parameter] parameters: the list of parameters
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:return: `parameters` keyed by ``(name, in_)``
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:rtype: dict[tuple(str,str),.Parameter]
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"""
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result = OrderedDict(((param.name, param.in_), param) for param in parameters)
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assert len(result) == len(parameters), "duplicate Parameters found"
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return result
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def filter_none(obj):
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"""Remove ``None`` values from tuples, lists or dictionaries. Return other objects as-is.
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:param obj:
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:return: collection with ``None`` values removed
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"""
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if obj is None:
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return None
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new_obj = None
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if isinstance(obj, dict):
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new_obj = type(obj)((k, v) for k, v in obj.items() if k is not None and v is not None)
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if isinstance(obj, (list, tuple)):
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new_obj = type(obj)(v for v in obj if v is not None)
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if new_obj is not None and len(new_obj) != len(obj):
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return new_obj # pragma: no cover
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return obj
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def force_serializer_instance(serializer):
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"""Force `serializer` into a ``Serializer`` instance. If it is not a ``Serializer`` class or instance, raises
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an assertion error.
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:param serializer: serializer class or instance
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:return: serializer instance
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"""
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if inspect.isclass(serializer):
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assert issubclass(serializer, serializers.BaseSerializer), "Serializer required, not %s" % serializer.__name__
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return serializer()
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assert isinstance(serializer, serializers.BaseSerializer), \
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"Serializer class or instance required, not %s" % type(serializer).__name__
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return serializer
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