How to Handle Input Types in TypeGraphQL for Mutations?

[Stormer0528]

I'm working on a GraphQL API using TypeGraphQL and want to create a mutation to add a new user. I understand I need to pass arguments like name and email to the mutation. How can I properly define and use input types for mutations in TypeGraphQL?

[skyward06]

To handle input types in TypeGraphQL, you can define a separate InputType class that serves as the structure for the mutation arguments. Here's an example for creating a new user with a mutation:

import "reflect-metadata";
import { ObjectType, Field, Int, InputType, Mutation, Arg, Resolver } from "type-graphql";

@ObjectType()
class User {
  @Field(() => Int)
  id: number;

  @Field()
  name: string;

  @Field()
  email: string;
}

let mockUsers = [
  { id: 1, name: "John Doe", email: "john@example.com" },
  { id: 2, name: "Jane Smith", email: "jane@example.com" },
];

@InputType()
class UserInput {
  @Field()
  name: string;

  @Field()
  email: string;
}

@Resolver()
class UserResolver {
  @Mutation(() => User)
  addUser(@Arg("data") data: UserInput): User {
    const newUser = { id: mockUsers.length + 1, ...data };
    mockUsers.push(newUser);
    return newUser;
  }
}