Question

我正在尝试一个带有形式的graphene-django示例。但我收到下一个错误：

`graphql.error.base.GraphQLError：无法为不可为空的字段[MyMutationPayload.name]返回null。

我尝试在perform_mutate函数中的返回表达式中设置值。如果请求未执行所有变体，则无法使用。

class MyForm(forms.Form):
  name = forms.CharField(min_length=10)
  age = forms.IntegerField(min_value=0)
  birth_date = forms.DateField()

class MyMutation(DjangoFormMutation):
  class Meta:
    form_class = MyForm

  @classmethod
  def perform_mutate(cls, form, info):
    print('ok')
    return cls(errors=[], name=form.cleaned_data.get('name'), age=form.cleaned_data.get('age'), birth_date=form.cleaned_data.get('birth_date'))

class Mutations():
  my_mutation = MyMutation.Field()

class Mutation(Mutations, ObjectType):
  pass

ROOT_SCHEMA = Schema(mutation=Mutation)

查询

mutation customMutation($data: MyMutationInput!){
  myMutation(input: $data){
    name
    age
    birthDate
    errors{
      field
      messages
    }
    clientMutationId
  }
}

变量

{
  "data": {
    "name": "Cristhiam",
    "age": "-29",
    "birthDate": "1990-04-06"
  }
}

响应

{
  "errors": [
    {
      "message": "Cannot return null for non-nullable field MyMutationPayload.name.",
      "locations": [
        {
          "line": 3,
          "column": 5
        }
      ],
      "path": [
        "myMutation",
        "name"
      ]
    }
  ],
  "data": {
    "myMutation": null
  }
}

突变结果应显示所有错误或所有表单值。

Answer 1

按以下步骤更改代码

class MyForm(forms.Form):
    name = forms.CharField(min_length=10)
    age = forms.IntegerField(min_value=0)
    birth_date = forms.DateField()


class MyMutation(DjangoFormMutation):
    class Meta:
        form_class = MyForm

    @classmethod
    def mutate_and_get_payload(cls, root, info, **input):
        print('ok')
        return cls(errors=[], name=input.get('name'), age=input.get('age'), birth_date=input.get('birth_date'))

class Mutations(ObjectType):
  my_mutation = MyMutation.Field()

class Mutation(Mutations, ObjectType):
  pass

ROOT_SCHEMA = Schema(mutation=Mutation)

输入是根据其文档传递给突变的参数。

Answer 2

有效：

    @classmethod
    def perform_mutate(cls, form, info):
        super().perform_mutate(form, info)
        return cls(errors=[], **form.cleaned_data)

对于具有石墨烯形式突变的不可为空的字段错误，无法返回null

2 个答案: