6.Fields领域

Graphene-Django provides some useful fields to help integrate Django with your GraphQL Schema.

Graphene-Django提供了一些有用的字段来帮助将Django与GraphQL模式集成。

DjangoListField Django列表字段

DjangoListField allows you to define a list of DjangoObjectType‘s. By default it will resolve the default queryset of the Django model.

DjangoListField允许您定义DjangoObjectType的列表。默认情况下，它将解析Django模型的默认queryset。

from graphene import ObjectType, Schema
from graphene_django import DjangoListField

class RecipeType(DjangoObjectType):
   class Meta:
      model = Recipe
      fields = ("title", "instructions")

class Query(ObjectType):
   recipes = DjangoListField(RecipeType)

schema = Schema(query=Query)

The above code results in the following schema definition:

上述模式定义中的结果如下：

schema {
  query: Query
}

type Query {
  recipes: [RecipeType!]
}

type RecipeType {
  title: String!
  instructions: String!
}

Custom resolvers 自定义冲突解决程序

If your DjangoObjectType has defined a custom get_queryset method, when resolving a DjangoListField it will be called with either the return of the field resolver (if one is defined) or the default queryset from the Django model.

如果您的djangObjectType定义了一个自定义的get_queryset方法，则在解析DjangoListField时，将通过返回字段解析程序（如果已定义）或Django模型中的默认queryset来调用该方法。

For example the following schema will only resolve recipes which have been published and have a title:

例如，以下模式将仅解析已发布并具有标题的配方：

from graphene import ObjectType, Schema
from graphene_django import DjangoListField

class RecipeType(DjangoObjectType):
   class Meta:
      model = Recipe
      fields = ("title", "instructions")

   @classmethod
   def get_queryset(cls, queryset, info):
      # Filter out recipes that have no title
      # 过滤掉没有标题的食谱
      return queryset.exclude(title__exact="")

class Query(ObjectType):
   recipes = DjangoListField(RecipeType)

   def resolve_recipes(parent, info):
      # Only get recipes that have been published
      # 只获取已经出版的食谱
      return Recipe.objects.filter(published=True)

schema = Schema(query=Query)

DjangoConnectionField Django连接字段

TODO