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我从 grand-stack 获得了演示示例，并且能够启动 graphql、启动 Neo4J 沙箱并使用填充测试数据库

npm run seedDb

但是，当我尝试编写自己的数据条目以填充到 neo4j 数据库中时，我根本无法使节点之间的关系起作用。错误消息是最无用的消息（我相信它来自 apollo 客户端，并且是状态码 400 错误）。我将代码简化为最简单的情况以使其工作，但它仍然没有。这是 schema.graphql 文件：

  type Patient {
  id: ID!
  name: String
  reviews: [Review] @relation(name:"WROTE", direction:"OUT")

}

type Review {
  id: ID!
  stars: Int
  text: String
  date: Date
  user: Patient @relation(name: "WROTE", direction: "IN")
}

这是 seed-mutation.js 文件：

export default /* GraphQL */ `
  mutation {
    p1: CreatePatient(
      id: "p1", 
      name: "John Doe 1"
    ) {
      id
      name
    } 

   r1: CreateReview(id: "r1", stars: 4, text: "Great IPA selection!", date: { formatted: "2016-01-03"}) {
      id
    }

  ar1: AddUserReviews(from: { id: "p1"}, to: { id: "r1" }) { from {id}}    

  }
`;

当我执行“npm run seedDb”时，会产生错误消息：

{ Error: Network error: Response not successful: Received status code 400
    at new ApolloError (/Users/xxxx/Downloads/grand-stack-starter-master/api/node_modules/apollo-client/bundle.esm.js:60:28)
    at Object.error (/Users/xxxx/Downloads/grand-stack-starter-master/api/node_modules/apollo-client/bundle.esm.js:1032:48)
    at notifySubscription (/Users/xxxx/Downloads/grand-stack-starter-master/api/node_modules/zen-observable/lib/Observable.js:134:18)
    at onNotify (/Users/xxxx/Downloads/grand-stack-starter-master/api/node_modules/zen-observable/lib/Observable.js:165:3)
    at SubscriptionObserver.error (/Users/xxxx/Downloads/grand-stack-starter-master/api/node_modules/zen-observable/lib/Observable.js:224:7)
    at /Users/xxxx/Downloads/grand-stack-starter-master/api/node_modules/apollo-link-http/src/httpLink.ts:184:20
    at <anonymous>
    at process._tickDomainCallback (internal/process/next_tick.js:228:7)
  graphQLErrors: [],
  networkError: 
   { ServerError: Response not successful: Received status code 400
    at Object.exports.throwServerError (/Users/xxxx/Downloads/grand-stack-starter-master/api/node_modules/apollo-link-http-common/src/index.ts:114:17)
    at /Users/xxxx/Downloads/grand-stack-starter-master/api/node_modules/apollo-link-http-common/src/index.ts:145:11
    at <anonymous>
    at process._tickDomainCallback (internal/process/next_tick.js:228:7)
     name: 'ServerError',
     response: 
      Response {
        size: 0,
        timeout: 0,
        [Symbol(Body internals)]: [Object],
        [Symbol(Response internals)]: [Object] },
     statusCode: 400,
     result: { errors: [Array] } },
  message: 'Network error: Response not successful: Received status code 400',
  extraInfo: undefined }

我从多个复杂代码开始，这几乎是最精简的版本。当我在将 seed-mutation.js 文件修改为：

export default /* GraphQL */ `
  mutation {
    p1: CreatePatient(
      id: "p1", 
      name: "John Doe 1"
    ) {
      id
      name
    } 

   r1: CreateReview(id: "r1", stars: 4, text: "Great IPA selection!", date: { formatted: "2016-01-03"}) {
      id
    }
  }
`;

数据库被填充，但是两个节点没有像预期的那样相互连接（基本上，这是删除了 AddUserReviews 的代码）。如何通过使用 graphql 和 seedDb 建立节点之间的关系？我错过了什么？

4

1 回答 1

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您可以使用 GraphQL Playground 来检查 GraphQL API（在“文档”选项卡中）：

GraphQL Playground 类型定义

以确保您调用的突变具有正确的名称和参数。通过检查架构，它看起来像，而不是AddUserReviews，你想要AddPatientReviews？

于 2019-07-31T22:17:38.103 回答