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https://github.com/graphql-python/graphene-django.git
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0b5f8e8507
Combine create and update into a single mutation. This can be disabled by returning None from `load_existing`.
93 lines
3.0 KiB
Python
93 lines
3.0 KiB
Python
from collections import OrderedDict
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import graphene
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from graphene.relay.mutation import ClientIDMutation
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from graphene.types import Field, InputField
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from graphene.types.mutation import MutationOptions
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from graphene.types.objecttype import yank_fields_from_attrs
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from .serializer_converter import convert_serializer_field
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from .types import ErrorType
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class SerializerMutationOptions(MutationOptions):
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serializer_class = None
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def fields_for_serializer(serializer, only_fields, exclude_fields, is_input=False):
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fields = OrderedDict()
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for name, field in serializer.fields.items():
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is_not_in_only = only_fields and name not in only_fields
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is_excluded = (
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name in exclude_fields # or
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# name in already_created_fields
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)
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if is_not_in_only or is_excluded:
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continue
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fields[name] = convert_serializer_field(field, is_input=is_input)
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return fields
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class SerializerMutation(ClientIDMutation):
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class Meta:
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abstract = True
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errors = graphene.List(
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ErrorType,
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description='May contain more than one error for same field.'
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)
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@classmethod
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def __init_subclass_with_meta__(cls, serializer_class=None,
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only_fields=(), exclude_fields=(), **options):
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if not serializer_class:
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raise Exception('serializer_class is required for the SerializerMutation')
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serializer = serializer_class()
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input_fields = fields_for_serializer(serializer, only_fields, exclude_fields, is_input=True)
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output_fields = fields_for_serializer(serializer, only_fields, exclude_fields, is_input=False)
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_meta = SerializerMutationOptions(cls)
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_meta.serializer_class = serializer_class
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_meta.fields = yank_fields_from_attrs(
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output_fields,
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_as=Field,
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)
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input_fields = yank_fields_from_attrs(
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input_fields,
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_as=InputField,
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)
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super(SerializerMutation, cls).__init_subclass_with_meta__(_meta=_meta, input_fields=input_fields, **options)
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@classmethod
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def mutate_and_get_payload(cls, root, info, **input):
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existing = cls.load_existing(cls._meta.serializer_class, input)
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serializer = cls._meta.serializer_class(existing, data=input)
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if serializer.is_valid():
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return cls.perform_mutate(serializer, info)
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else:
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errors = [
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ErrorType(field=key, messages=value)
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for key, value in serializer.errors.items()
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]
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return cls(errors=errors)
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@classmethod
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def load_existing(cls, serializer_class, data):
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id = data.get('id')
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if id is not None:
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model_class = serializer_class.Meta.model
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return model_class.objects.get(id=data['id'])
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return None
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@classmethod
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def perform_mutate(cls, serializer, info):
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serializer.save()
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return cls(errors=None, **serializer.data)
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