Question

166

Nest JS GraphQL “Cannot return null for non-nullable”

rated 0 times [ 169] [ 3] / answers: 1 / hits: 12793 / 5 Years ago, fri, september 27, 2019, 12:00:00

I tried to resolve one error in my study code, but failed. Then I just try to launch this code...

https://github.com/nestjs/nest/tree/master/sample/23-type-graphql

and the same situation...

Error looks like

{

  errors: [

    {

      message: Cannot return null for non-nullable field Recipe.id.,

      locations: [

        {

          line: 3,

          column: 5

        }

      ],

      path: [

        recipe,

        id

      ],

      extensions: {

        code: INTERNAL_SERVER_ERROR,

        exception: {

          stacktrace: [

            Error: Cannot return null for non-nullable field Recipe.id.,

                at completeValue (/home/innistry/Downloads/nest-master/sample/23-type-graphql/node_modules/graphql/execution/execute.js:560:13),

                at /home/innistry/Downloads/nest-master/sample/23-type-graphql/node_modules/graphql/execution/execute.js:492:16,

                at process._tickCallback (internal/process/next_tick.js:68:7)

          ]

        }

      }

    }

  ],

  data: null

}

Has someone ideas?

Answers

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alexandreah

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answered 5 Years ago emilianoc · Accepted Answer

This is the fastest fix, just to launch.

import { Field, ID, ObjectType } from 'type-graphql';



@ObjectType()

export class Recipe {

  @Field(type => ID, { nullable: true })

  id?: string;



  @Field({ nullable: true })

  title?: string;



  @Field({ nullable: true })

  description?: string;



  @Field({ nullable: true })

  creationDate?: Date;



  @Field(type => [String], { nullable: true })

  ingredients?: string[];

}