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86 lines
2.2 KiB
ReStructuredText
86 lines
2.2 KiB
ReStructuredText
Fields
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======
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Graphene-Django provides some useful fields to help integrate Django with your GraphQL
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Schema.
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DjangoListField
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---------------
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``DjangoListField`` allows you to define a list of :ref:`DjangoObjectType<queries-objecttypes>`'s. By default it will resolve the default queryset of the Django model.
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.. code:: python
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from graphene import ObjectType, Schema
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from graphene_django import DjangoListField
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class RecipeType(DjangoObjectType):
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class Meta:
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model = Recipe
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fields = ("title", "instructions")
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class Query(ObjectType):
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recipes = DjangoListField(RecipeType)
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schema = Schema(query=Query)
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The above code results in the following schema definition:
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.. code::
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schema {
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query: Query
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}
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type Query {
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recipes: [RecipeType!]
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}
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type RecipeType {
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title: String!
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instructions: String!
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}
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Custom resolvers
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****************
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If your ``DjangoObjectType`` has defined a custom
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:ref:`get_queryset<django-objecttype-get-queryset>` method, when resolving a
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``DjangoListField`` it will be called with either the return of the field
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resolver (if one is defined) or the default queryset from the Django model.
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For example the following schema will only resolve recipes which have been
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published and have a title:
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.. code:: python
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from graphene import ObjectType, Schema
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from graphene_django import DjangoListField
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class RecipeType(DjangoObjectType):
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class Meta:
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model = Recipe
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fields = ("title", "instructions")
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@classmethod
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def get_queryset(cls, queryset, info):
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# Filter out recipes that have no title
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return queryset.exclude(title__exact="")
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class Query(ObjectType):
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recipes = DjangoListField(RecipeType)
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def resolve_recipes(parent, info):
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# Only get recipes that have been published
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return Recipe.objects.filter(published=True)
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schema = Schema(query=Query)
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DjangoConnectionField
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---------------------
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``DjangoConnectionField`` acts similarly to ``DjangoListField`` but returns a
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paginated connection following the `relay spec <https://relay.dev/graphql/connections.htm>`__
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The field supports the following arguments: `first`, `last`, `offset`, `after` & `before`.
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