错误：未知指令“关系”。与 Neo4j 的大堆栈

Question

我正在尝试使用 neo4j 的 grand-stack-starter，并在完成所有 graphql 模式部分后使用 API 模块收到以下错误。它抱怨指令“关系”和“密码”是未知的。 我重新安装了 neo4j-graphql-js 但没有解决问题。 以下是错误信息

grand-stack-starter-api@0.0.1 start C:\Users\grand-stack-starter-master\api
nodemon --exec babel-node src/index.js

[nodemon] 1.18.9
[nodemon] to restart at any time, enter rs
[nodemon] watching: .
[nodemon] starting babel-node src/index.js
C:\Users\grand-stack-starter-master\api\node_modules\graphql\validation\validate.js:89
throw new Error(errors.map(function (error) {
^

Error: Unknown directive "relation".

Unknown directive "relation".

Unknown directive "cypher".

Unknown directive "cypher".

Unknown directive "relation".

Unknown directive "relation".

Unknown directive "relation".

Unknown directive "relation".

Unknown directive "relation".

Unknown directive "cypher".
    at assertValidSDL (C:\Users\N19683\grand-stack-starter-master\api\node_modules\graphql\validation\validate.js:89:11)
    at Object.buildASTSchema (C:\Users\N19683\grand-stack-starter-master\api\node_modules\graphql\utilities\buildASTSchema.js:67:34)
    at Object.buildSchemaFromTypeDefinitions (C:\Users\N19683\grand-stack-starter-master\api\node_modules\graphql-tools\src\generate\buildSchemaFromTypeDefinitions.ts:43:32)
    at makeExecutableSchema (C:\Users\N19683\grand-stack-starter-master\api\node_modules\graphql-tools\src\makeExecutableSchema.ts:52:16)
    at Object.<anonymous> (C:/Users/N19683/grand-stack-starter-master/api/src/index.js:18:16)
    at Module._compile (internal/modules/cjs/loader.js:778:30)
    at loader (C:\Users\N19683\grand-stack-starter-master\api\node_modules\babel-register\lib\node.js:144:5)
    at Object.require.extensions.(anonymous function) [as .js] (C:\Users\N19683\grand-stack-starter-master\api\node_modules\babel-register\lib\node.js:154:7)
    at Module.load (internal/modules/cjs/loader.js:653:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
**

下面是graphql-schema.js

import { neo4jgraphql } from "neo4j-graphql-js";

export const typeDefs = `
type User {
  id: ID!
  name: String
  friends: [User] @relation(name: "FRIENDS", direction: "BOTH")
  reviews: [Review] @relation(name: "WROTE", direction: "OUT")
  avgStars: Float
    @cypher(
      statement: "MATCH (this)-[:WROTE]->(r:Review) RETURN toFloat(avg(r.stars))"
    )
  numReviews: Int
    @cypher(statement: "MATCH (this)-[:WROTE]->(r:Review) RETURN COUNT(r)")
}

type Business {
  id: ID!
  name: String
  address: String
  city: String
  state: String
  reviews: [Review] @relation(name: "REVIEWS", direction: "IN")
  categories: [Category] @relation(name: "IN_CATEGORY", direction: "OUT")
}

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

type Category {
  name: ID!
  businesses: [Business] @relation(name: "IN_CATEGORY", direction: "IN")
}

type Query {
  usersBySubstring(substring: String): [User]
    @cypher(
      statement: "MATCH (u:User) WHERE u.name CONTAINS $substring RETURN u"
    )
}
`

export const resolvers = {
  Query: {
    Users: neo4jgraphql,
    Business: neo4jgraphql,
    Category: neo4jgraphql,
    Review: neo4jgraphql
  }
};

index.js

import { typeDefs, resolvers } from "./graphql-schema";
import { ApolloServer, gql, makeExecutableSchema  } from "apollo-server";
import { v1 as neo4j } from "neo4j-driver";
import { augmentSchema } from "neo4j-graphql-js";
import dotenv from "dotenv";

// set environment variables from ../.env
dotenv.config();



const schema = makeExecutableSchema({
  typeDefs,
  resolvers
});

const augmentedSchema = augmentSchema(schema);

const driver = neo4j.driver(
  process.env.NEO4J_URI || "bolt://localhost:7689",
  neo4j.auth.basic(
    process.env.NEO4J_USER || "neo4j",
    process.env.NEO4J_PASSWORD || "letmein"
  )
);


const server = new ApolloServer({
  context: { driver },
  schema: augmentedSchema
});

server.listen(process.env.GRAPHQL_LISTEN_PORT, "0.0.0.0").then(({ url }) => {
  console.log(`GraphQL API ready at ${url}`);
});

谁能帮忙解决这个问题！提前致谢

Answer 1

如docs中所述

注意：仅当您使用现有的 GraphQLSchema 对象时才使用 augmentSchema。在大多数情况下，您应该使用 makeAugmentedSchema，它可以根据类型定义构造 GraphQLSchema 对象。

发生错误是因为您尝试使用makeExecutableSchema 创建架构。 @relation 和 @cypher 指令由 neo4j-graphql 独占使用。由于它们实际上并未定义为架构的一部分，因此使用 makeExecutableSchema 构建架构将导致错误，就像使用任何其他未定义指令一样。

你应该改用makeAugmentedSchema：

const schema = makeAugmentedSchema({
  typeDefs,
  resolvers,
})
const driver = /* ... */
const server = new ApolloServer({
  context: { driver },
  schema,
})