模式指令

Strawberry 支持模式指令，这些指令不会改变 GraphQL 模式的行为，而是提供了向其添加额外元数据的方法。

例如，Apollo Federation 集成是基于模式指令的。

模式中使用：

# directives.py
import strawberry
from strawberry.schema_directive import Location


@strawberry.schema_directive(locations=[Location.OBJECT])
class Keys:
    fields: str

from .directives import Keys


@strawberry.type(directives=[Keys(fields="id")])
class User:
    id: strawberry.ID
    name: str

这将产生以下模式：

type User @keys(fields: "id") {
  id: ID!
  name: String!
}

重载字段名称

可以使用 strawberry.directive_field 重载字段名称：

@strawberry.schema_directive(locations=[Location.OBJECT])
class Keys:
    fields: str = strawberry.directive_field(name="as")

站点

模式指令可以应用于模式的许多不同部分。以下是所有允许的站点列表：

Name		Description
SCHEMA	strawberry.Schema	The definition of a schema
SCALAR	strawberry.scalar	The definition of a scalar
OBJECT	strawberry.type	The definition of an object type
FIELD_DEFINITION	strawberry.field	The definition of a field on an object type or interface
ARGUMENT_DEFINITION	strawberry.argument	The definition of an argument
INTERFACE	strawberry.interface	The definition of an interface
UNION	strawberry.union	The definition of an union
ENUM	strawberry.enum	The definition of a enum
ENUM_VALUE	strawberry.enum_value	The definition of a enum value
INPUT_OBJECT	strawberry.input	The definition of an input object type
INPUT_FIELD_DEFINITION	strawberry.field	The definition of a field on an input type