Node.js Mongodb GraphQL - mutations and query - node.js

Question

I have problem with some parts of my code:
const BookType = new GraphQLObjectType({
name: "Book",
fields: () => ({
id: {type: GraphQLID},
title: {type: GraphQLString},
author: {type: GraphQLString},
})
})
const fQuery = new GraphQLObjectType({
name: "firstQuery",
fields: {
books: {
type: new GraphQLList(BookType),
resolve(parent, args){
return Book.find({});
}
},
book: {
type: BookType,
args: {id: {type: GraphQLID}},
resolve(parent, args){
return Book.findById(args.id);
}
},
author: {
type: BookType,
args: {author: {type: GraphQLString}},
resolve(parent, args){
return ??????????
}
},
}
})
I don't know how to find book by author.
Next thing - mutations:
const Mutation = new GraphQLObjectType({
name: "Mutation",
fields: {
add: {
type: BookType,
args: {
title: {type: GraphQLString},
author: {type: GraphQLString},
},
resolve(parent,args){
let book = new Book({
title:args.title,
author:args.author,
})
return book.save()
}
},
update: {
type: BookType,
args: {
title: {type: GraphQLString},
author: {type: GraphQLString},
},
resolve(parent, args){
return Book.findByIdAndUpdate(args.id, {
title: args.title,
author: args.author
})
}
},
del: {
type: BookType,
args: {
id: {type: GraphQLID},
},
resolve(parent,args){
return Book.findByIdAndDelete(args.id)
}
}
}
});
Update does not work. Delete removes the first item, not the selected one by ID. This is my homework assignment. I've been sitting on this for a few hours now and can't seem to get it right.
Do anyone of you know how to fix this?
thanks in advance!
UPDATE: Searching by author does not work. I was able to fix the rest.

Answer 1

You also need an author GraphQLObjectType and if you store the id of the author in your books you can add a new field in author
EDIT: Also you can try find by name (but it must be unique or you will have conflicted results)
booksByAuthor: {
type: GraphQLList(BookType),
async resolve(parent, args) {
return Books.find( { id:parent.id } )
},
}
So will be something like
const AuthorType = new GraphQLObjectType({
name: 'Author',
fields: () => ({
id: { type: GraphQLID },
name: { type: GraphQLString },
booksByAuthor: {
type: GraphQLList(BookType),
async resolve(parent, args) {
return Books.find({ id: parent.id });
},
},
}),
});
I don't see the id as argument in your mutation. You need to pass the id.
update: {
type: BookType,
args: {
id:{type: GraphQLID}
title: {type: GraphQLString},
author: {type: GraphQLString},
},
resolve(parent, args){
return Book.findByIdAndUpdate(args.id, {
title: args.title,
author: args.author
})
}
},
I'm new to this as well but I hope it helps