Neo4j/GraphQL增强架构

Question

我想了解一点Neo4j的GraphQL集成。我使用的是GrandStack starter，可以在这里找到。Grand Stack Starter。starter没有使用您在其他GrapQL应用程序中看到的大量样板，因为据我所知，Neo4j集成应该绕过双重声明模式和解析器的需要。它使用的是Apollo Server和一个"augmentedSchema“。使用启动代码，我尝试向模式中添加一些突变，在本例中，就是deleteUser突变。我一直收到一个错误，说突变id定义了不止一次，而我知道我只是把它放在代码中的一个地方。这是我的schema.js：

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

export const typeDefs = `
type User {
  id: ID!
  name: String
  friends(first: Int = 10, offset: Int = 0): [User] @relation(name: "FRIENDS", direction: "BOTH")
  reviews(first: Int = 10, offset: Int = 0): [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(first: Int = 10, offset: Int = 0): [Review] @relation(name: "REVIEWS", direction: "IN")
  categories(first: Int = 10, offset: Int =0): [Category] @relation(name: "IN_CATEGORY", direction: "OUT")
}

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

type Category {
  name: ID!
  businesses(first: Int = 10, offset: Int = 0): [Business] @relation(name: "IN_CATEGORY", direction: "IN")
}

type Query {
    users(id: ID, name: String, first: Int = 10, offset: Int = 0): [User]
    businesses(id: ID, name: String, first: Int = 10, offset: Int = 0): [Business]
    reviews(id: ID, stars: Int, first: Int = 10, offset: Int = 0): [Review]
    category(name: ID!): Category
    usersBySubstring(substring: String, first: Int = 10, offset: Int = 0): [User] @cypher(statement: "MATCH (u:User) WHERE u.name CONTAINS $substring RETURN u")
}

type Mutation {

    deleteUser(id: ID!): User
}

`;

export const resolvers = {
    Query: {
        users: neo4jgraphql,
        businesses: neo4jgraphql,
        reviews: neo4jgraphql,
        category: neo4jgraphql,
        usersBySubstring: neo4jgraphql
    },

    Mutation: {
        deleteUser: neo4jgraphql
    }
};

这是我的索引：

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";

dotenv.config();

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

// augmentSchema will add autogenerated mutations based on types in schema
const augmentedSchema = augmentSchema(schema);

const driver = neo4j.driver(
    process.env.NEO4J_URI || "bolt://localhost:7687",
    neo4j.auth.basic(
    process.env.NEO4J_USER || "neo4j",
    process.env.NEO4J_PASSWORD || "neo4j"
    )
);

if (driver){
    console.log("Database Connected")
} else{
    console.log("Database Connection Error")
}

const server = new ApolloServer({
  // using augmentedSchema (executable GraphQLSchemaObject) instead of typeDefs and resolvers
  //typeDefs,
  //resolvers,
  context: { driver },
  // remove schema and uncomment typeDefs and resolvers above to use original (unaugmented) schema
  schema: augmentedSchema
});

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

错误消息：

​

starter中的任何其他代码都没有更改。我在文档中找不到太多关于augmentedSchema的信息。如果有人能给我指出正确的方向，我将不胜感激。

Answer 1

这个问题是由augmentedSchema引起的，它会自动为每种类型创建缺省突变，即在本例中它已经创建了delete user、update user和add user。您可以在运行GraphiQL服务器时看到这一点。所以我双重声明了delete用户突变。