使用 graphql-compose-mongoose 将对象添加到 mongodb 模型中的对象数组

Posted 2023-03-11

【中文标题】使用 graphql-compose-mongoose 将对象添加到 mongodb 模型中的对象数组

【英文标题】：Add object to object array within mongodb model with graphql-compose-mongoose

【发布时间】：2021-07-04 11:05:21

【问题描述】：

我制作了一个 GraphQL API 来检索和操作 mongo 数据库中的数据。此数据代表一个作者，其中包含 Author.ts 中所示的书籍列表。

作者.ts：

import  Document, Model, model, Schema  from "mongoose";
import  Ibook  from "./book";

export interface Iauthor extends Document 
    name: String;
    books: Array<Ibook>;
  
  
const AuthorSchema: Schema = new Schema(
    name:  type: String, required: true ,
    books:  type: Array, required: true 
  );
  
export const Author: Model<Iauthor> = model('author', AuthorSchema);

Book.ts：

import Document, Model, model, Schema from "mongoose";

export interface Ibook extends Document 
    title: String;
    pages: Number;
  
  
const BookSchema: Schema = new Schema(
    title:  type: String, required: true ,
    pages:  type: Number, required: true 
  );
  
export const Book: Model<Ibook> = model('book', BookSchema);

我正在使用查询解析器和突变解析器来读取和操作这些对象。我只是迁移到 graphql-compose-mongoose 来生成解析器，而不是自己编程。在遇到解析器“AssignBooktoAuthor”之前，我成功迁移了每个查询和突变。这基本上是一个将书籍对象添加到作者书籍列表的解析器。我只是不知道如何让它与 graphql-compose-mongoose 一起工作。

composer.ts：

import  composeMongoose  from "graphql-compose-mongoose";
import  schemaComposer  from "graphql-compose";
import  Book  from "./models/book";
import  Author  from "./models/author";

const customizationOptions = ;
const BookTC = composeMongoose(Book, customizationOptions);
const AuthorTC = composeMongoose(Author, customizationOptions);

//in aparte file zetten prob
schemaComposer.Query.addFields(
  getAllBooks: BookTC.mongooseResolvers.findMany(),
  getBookById: BookTC.mongooseResolvers.findById(),
  getAllAuthors: AuthorTC.mongooseResolvers.findMany(),
  getAuthorById: AuthorTC.mongooseResolvers.findById(),
);

schemaComposer.Mutation.addFields(
  CreateBook: BookTC.mongooseResolvers.createOne(),
  UpdateBook: BookTC.mongooseResolvers.updateById(),
  DeleteBook: BookTC.mongooseResolvers.removeById(),
  CreateAuthor: AuthorTC.mongooseResolvers.createOne(),
  UpdateAuthor: AuthorTC.mongooseResolvers.updateById(),
  DeleteAuthor: AuthorTC.mongooseResolvers.removeById(),
  /**AssignBooktoAuthor: AuthorTC.mongooseResolvers.///What function does this??///**/
);

const graphqlSchema = schemaComposer.buildSchema();
export default graphqlSchema;

gql.ts（服务器文件）：

import  ApolloServer, gql  from "apollo-server-express";
import * as mongoose from "mongoose";
import * as express from "Express";
import * as dotenv from "dotenv";
import * as jwt from "jsonwebtoken";
import graphqlSchema from "./composer";

const app = express();
 
dotenv.config();

(async () => 
  mongoose.connect("mongodb+srv://xxxxxxx:[e-mail]/myFirstDatabase?retryWrites=true&w=majority",  useUnifiedTopology: true , useNewUrlParser: true);

  const server = new ApolloServer( 
    schema: graphqlSchema,
  );

  await server.start();

  //verifying token 
  app.use((req, res, next) => 
    const Token = req.header('auth-token');
    try
      (Token && jwt.verify(Token, process.env.TOKEN_SECRET)) ? next() : console.log("mw: Unauthorized");
    catch(err)
      console.log("mw:Unauthorized");
    
  );

  server.applyMiddleware( app );
  
  app.listen( port: 4000 , () =>
  console.log(`???? Server ready at http://localhost:4000$server.graphqlPath`)
  );

)();

由于对 graphql-compose-mongoose 的支持不是很大，我希望有人可以帮助我解决这个问题！

【参考方案1】：

我自己找到了解决方案！

Graphql 支持通过对象 id 添加关系。因此，在模型中，您必须分配一个名为 authorid 的类型，然后添加一个带有 objectid 类型的“ref”。例如，参见 book.ts。有关 addrelation 示例，请参见 composer.ts。

Book.ts：

export interface Ibook extends Document 
  title: String;
  pages: Number;
  author: Schema.Types.ObjectId; 

  
const BookSchema: Schema = new Schema(
  title:  type: String, required: true ,
  pages:  type: Number, required: true ,
  author:  type: Schema.Types.ObjectId, ref:"author", required: true
);

Composer.ts：

BookTC.addRelation('author', 
  resolver: () => AuthorTC.mongooseResolvers.findById(),
  prepareArgs:
    _id: source => source.author,
    skip: null,
    sort: null,    
  ,
  projection: author: true,
)

AuthorTC.addRelation('books', 
  resolver: () => BookTC.mongooseResolvers.findMany(),
  prepareArgs: 
    filter: source => ( author: source._id ),
  ,
  projection:  id: true ,
);