如何在graphenepython Djangobjecttyp中获取模型的当前实例

Question

我有一个graphene python djangobjecttype类，我想添加一个自定义类型，但是我不知道如何在resolver函数中获取当前模型实例。我正在跟踪this tutorial，但找不到任何参考资料。你知道吗

这是我的DjangoObjectTypeClass：

class ReservationComponentType(DjangoObjectType):
    component_str = graphene.String()

    class Meta:
        model = ReservationComponent

    def resolve_component_str(self, info):
        # How can I get the current ReservationComponent instance here?. I guess it is somewehere in 'info', 
        # but documentation says nothing about it

        current_reservation_component = info.get('reservation_component')
        component = current_reservation_component.get_component()

        return component.name

我的问题与Graphene resolver for an object that has no model不同，因为我的对象确实有一个模型。我不知道为什么它被标记为“可能复制”有如此明显的区别。我的问题确实是基于这个模型。你知道吗

Answer 1

是的，它在info的某个地方，也就是这里：

type_model = info.parent_type.graphene_type._meta.model

但如果使用DjangoObjectType，则实例将传递给self。你可以走另一条路：

class ReservationComponentType(DjangoObjectType):
    component_str = graphene.String()

    class Meta:
        model = ReservationComponent

    def resolve_component_str(self, info):
        # self is already an instance of type's model (not sure if it is in all cases):
        component_class = self.__class__

        current_reservation_component = info.get('reservation_component')
        component = current_reservation_component.get_component()

        return component.name