'GraphQLError: Query root type must be provided

I'm using NestJS, TypeORM and GraphQL for my backend API. I'm getting the following error:

GraphQLError [Object]: Query root type must be provided.
      at SchemaValidationContext.reportError (/home/wise-introvert/Container/Projects/the-notebook/app/server/node_modules/graphql/type/validate.js:88:19)
      at validateRootTypes (/home/wise-introvert/Container/Projects/the-notebook/app/server/node_modules/graphql/type/validate.js:107:13)
      at validateSchema (/home/wise-introvert/Container/Projects/the-notebook/app/server/node_modules/graphql/type/validate.js:52:3)
      at graphqlImpl (/home/wise-introvert/Container/Projects/the-notebook/app/server/node_modules/graphql/graphql.js:79:62)
      at /home/wise-introvert/Container/Projects/the-notebook/app/server/node_modules/graphql/graphql.js:28:59
      at new Promise (<anonymous>)
      at Object.graphql (/home/wise-introvert/Container/Projects/the-notebook/app/server/node_modules/graphql/graphql.js:26:10)
      at GraphQLSchemaFactory.<anonymous> (/home/wise-introvert/Container/Projects/the-notebook/app/server/node_modules/@nestjs/graphql/dist/schema-builder/graphql-schema.factory.js:49:52)
      at Generator.next (<anonymous>)
      at /home/wise-introvert/Container/Projects/the-notebook/app/server/node_modules/tslib/tslib.js:114:75

This is what my file structure and code looks like: enter image description here

Can someone please help me. My repo: https://github.com/wise-introvert/nestjs-graphql-api.git

postgresqlgraphqlnestjstypeorm


Solution 1:[1]

All servers running with GraphQL must have at least one @Query() to be considered a valid GraphQL server. Without it, the apollo-server package will throw an exception and the server will fail to start. This can be as simple as

@Resolver()
export class FooResolver {

  @Query(() => String)
  sayHello(): string {
    return 'Hello World!';
  }
}

Solution 2:[2]

Also ensure the Resolver is added in the module providers

@Module({
  imports: [
    GraphQLModule.forRoot({
      installSubscriptionHandlers: true,
      autoSchemaFile: true,
    }),
  ],
  controllers: [],
  providers: [FooResolver], //< This
})
export class FooModule {}

Solution 3:[3]

This answer is not a direct answer to the question.

But if you are facing the described problem and the answers don't help, recheck if you are using the correct imports:

// Correct
import { Resolver, Query } from '@nestjs/graphql';

// Incorrect in NestJS
import { Resolver, Query } from 'type-graphql';

Solution 4:[4]

In my case I had nfts.module.ts which is registered in app.module.ts but it was not configured properly. I had to pass providers

@Module({ providers: [NftsResolver, NftsService] })
export class NftsModule {}

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 Jay McDoniel
Solution 2
Solution 3 ouflak
Solution 4 Yilmaz

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