relay - Graphite 烯中的自定义 ConnectionField

Question

我不明白如何在 Graphite 烯的 ConnectionField 中使用自定义字段。我有类似的东西:

class ShipConnection(Connection):
    extra = String()

    class Meta:
        node = Ship

SHIPS = ['Tug boat', 'Row boat', 'Canoe']

class Query(AbstractType):
    ships = relay.ConnectionField(ShipConnection)

    def resolve_ships(self, args, context, info):
        return ShipConnection(
            extra='Some extra text',
            edges=???
        )

通常，你会说:

    def resolve_ships(self, args, context, info):
        return SHIPS

但是如何返回额外的东西和返回一个列表？

Answer 1

答案原来是使用 Graphite 烯的 ConnectionField 类的一个未记录的类方法，称为 resolve_connection。以下作品:

def resolve_ships(self, args, context, info):
    field = relay.ConnectionField.resolve_connection(
        ShipConnection,
        args,
        SHIPS
    )

    field.extra = 'Whatever'
    return field