I made a GraphQL API to retrieve and manipulate data in a mongo database. This data represents an author that contains a list of books as shown in Author.ts.
Author.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);
I'm using query resolvers and mutation resolvers to read and manipulate these objects. I just migrated to graphql-compose-mongoose to generate the resolvers instead of programming them myself. I succeeded in migrating every query and mutation till I encountered my resolver "AssignBooktoAuthor". This basicly is a resolver that adds a book object to the authors books list. I simply do not know how to get it working with graphql-compose-mongoose.
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 (server file):
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:xxxxxxx@clusterxxxxx.mongodb.net/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}`)
);
})();
Since the support on graphql-compose-mongoose is not that big I hope there is someone who can help me with this problem!
I found the solution myself!
Graphql supports the use of adding relations by object id. So in the model you have to assign a type called something like authorid and then add a "ref" with the objectid type. see book.ts for example. See composer.ts for the addrelation example.
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 },
});
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