Error: Cannot determine a GraphQL input type ("TypeService") for the "servicesType". Make sure your class is decorated with an appropriate decorator

Question

import { ObjectType, Field, Int, ID } from '@nestjs/graphql';
import { TypeService } from 'src/type-services/entities/type-service.entity';

@ObjectType()
export class Schedule {
  @Field(() => ID)
  id?: string;

  @Field(() => Date)
  date: string | Date;

  @Field(() => String)
  userID: string;

  @Field(() => [TypeService])
  servicesType?: TypeService[];
}


import { InputType, Int, Field, ID } from '@nestjs/graphql';
import { TypeService } from 'src/type-services/entities/type-service.entity';

@InputType()
export class CreateScheduleInput {
  @Field(() => String)
  userID: string | null;

  @Field()
  date: Date;

  @Field(() => [TypeService])
  servicesType?: TypeService[];
}

Error: Cannot determine a GraphQL input type ("TypeService") for the "servicesType". Make sure your class is decorated with an appropriate decorator.

Answer 1

I am assuming that TypeService is either annotated with @ObjectType() or not annotated at all as it is the most likely reason for the error.

The issue is that you are using a non-InputType (TypeService) as a property of an InputType (CreateScheduleInput), and nested fields of an InputType must be InputTypes as well.

The solution would be to define an InputType for the TypeService (such as CreateTypeServiceInput) which would be annotated with @InputType().