如何使Django Graphene ModelForm Mutation生效

Question

我试图使这个mutation在数据库中创建一个新记录。它返回代码200，但对数据库没有任何更改，同时返回null。关于这个问题文档不是很清楚。(ModelForm vs mutate function)

Graphql响应：

{
  "data": {
    "addSubjectMark": {
      "subjectMark": null,
      "errors": []
    }
  }
}

根据django-graphene文档，我正在使用DjangoModelForm来处理对数据库的输入。

我的schema.py:

class SubjectMarkType(DjangoObjectType):
    id = graphene.ID(required=True)
    class Meta:
        model = SubjectMark

class AddSubjectMarkMutation(DjangoModelFormMutation):
    subject_mark = graphene.Field(SubjectMarkType)
    class Meta:
        form_class = ReportForm

class Mutation(graphene.ObjectType):
    add_subject_mark = AddSubjectMarkMutation.Field()

1. 我需要在表单中添加保存方法吗？
2. 我需要使用mutate函数吗？（文档不清楚）

谢谢！

- Alan Karanja

Answer 1

ReportForm 应该默认与 Django 一起工作，无需进行修改。 缺失的部分是解决 AddSubjectMarkMutation 类中的 subject_mark 属性。

class SubjectMarkType(DjangoObjectType):
    id = graphene.ID(required=True)

    class Meta:
        model = SubjectMark


class AddSubjectMarkMutation(DjangoModelFormMutation):
    subject_mark = graphene.Field(SubjectMarkType)

    class Meta:
        form_class = ReportForm  # NB. make sure ReportForm is able to save in Django

    # you need to resolve subject_mark to return the new object
    def resolve_subject_mark(self, info, **kwargs):
        return self.subjectMark


class Mutation(graphene.ObjectType):
    add_subject_mark = AddSubjectMarkMutation.Field()

- William Osilaja Boampong