Why GraphQL fits NestJS architecture - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the GraphQL module in a NestJS app.

NestJS

import { [1] } from '@nestjs/graphql';

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AHttpModule

BConfigModule

CGraphQLModule

DDatabaseModule

Attempts:

3 left

💡 Hint

Common Mistakes

Importing unrelated modules like HttpModule.

Confusing GraphQLModule with ConfigModule.

The GraphQLModule is the main module to integrate GraphQL in NestJS.

2fill in blank

medium

Complete the code to configure GraphQL in NestJS with code-first approach.

NestJS

GraphQLModule.forRoot({
  autoSchemaFile: [1],
}),

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Atrue

Bfalse

C'schema.gql'

Dnull

Attempts:

3 left

💡 Hint

Common Mistakes

Using a string filename instead of true for code-first.

Setting autoSchemaFile to false disables schema generation.

Setting autoSchemaFile to true enables code-first schema generation.

3fill in blank

hard

Fix the error in the resolver decorator to define a GraphQL query.

NestJS

@[1]()
export class SampleResolver {
  @Query(() => String)
  hello() {
    return 'Hello World';
  }
}

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AModule

BController

CInjectable

DResolver

Attempts:

3 left

💡 Hint

Common Mistakes

Using @Controller instead of @Resolver.

Forgetting to decorate the resolver class.

The @Resolver() decorator marks the class as a GraphQL resolver in NestJS.

4fill in blank

hard

Fill both blanks to define a GraphQL query method with a return type.

NestJS

import { Query, [1] } from '@nestjs/graphql';

@Resolver()
export class UserResolver {
  @Query(() => [2])
  getUser() {
    return 'User1';
  }
}

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AResolver

BMutation

CString

DInjectable

Attempts:

3 left

💡 Hint

Common Mistakes

Importing Mutation instead of Resolver.

Using Injectable instead of Resolver.

Using Mutation as return type.

The Resolver decorator is imported to mark classes, and String is used as the GraphQL return type.

5fill in blank

hard

Fill all three blanks to create a GraphQL mutation method with an argument.

NestJS

import { Mutation, Arg, [1] } from '@nestjs/graphql';

@[2]()
export class PostResolver {
  @Mutation(() => Boolean)
  createPost(@Arg('[3]') title: string) {
    return true;
  }
}

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AResolver

BQuery

Ctitle

DInjectable

Attempts:

3 left

💡 Hint

Common Mistakes

Using Query instead of Resolver for the class.

Using Injectable instead of Resolver.

Mismatching argument name in @Arg.

The Resolver decorator marks the class, and the argument name title is used in @Arg.