graphQLErrors 未定义，如何从 apollo 响应中提取错误答案

【问题标题】：graphQLErrors is undefined, how extract errors from apollo responsegraphQLErrors 未定义，如何从 apollo 响应中提取错误
【发布时间】：2019-12-10 18:12:34
【问题描述】：

我在服务器上实现class-validator 以获取注册表单。我的目标是捕获错误并通过错误将错误消息写入特定字段。

我在docs 中读到应该从graphQLErrors 得到错误，但在我的情况下它是未定义的。

我的突变：

        const { data, errors } = await apolloClient.mutate<RegistrationWithEmail, RegistrationWithEmailVariables>({
          mutation: registrationWithEmailMutation,
          variables: {
            payload: {
             ....
            },
          },
        })

错误对象：

"[
  {
    "message": "Argument Validation Error",
    "locations": [
      {
        "line": 2,
        "column": 3
      }
    ],
    "path": [
      "registrationWithEmail"
    ],
    "extensions": {
      "code": "INTERNAL_SERVER_ERROR",
      "exception": {
        "validationErrors": [
          {
            "target": {
              "role": "creator",
              "email": "myemail@email.com",
              "password": "myweakpassword",
              "firstName": "Edgaras",
              "lastName": "Karka"
            },
            "value": "myweakpassword",
            "property": "password",
            "children": [],
            "constraints": {
              "matches": "WEAK_PASSWORD"
            }
          }
        ],
        "stacktrace": [
          "Error: Argument Validation Error",
          "    at Object.<anonymous> (/node_modules/type-graphql/dist/resolvers/validate-arg.js:21:19)",
          "    at Generator.throw (<anonymous>)",
          "    at rejected (/node_modules/tslib/tslib.js:105:69)",
          "    at processTicksAndRejections (internal/process/task_queues.js:86:5)"
        ]
      }
    }
  }
]"

【问题讨论】：

标签： graphql apollo react-apollo

【解决方案1】：

如果这可能对某人有所帮助，您可以通过

访问错误属性

yourMutation().catch(err =&gt; console.log(err.graphQLErrors[0].extensions.code))

【讨论】：

graphQLErrors 对象是否总是只包含一项？还是可以包含更多？