How to resolve WP Post Object by custom mutation ?

[jiwon-mun]

add_action( 'graphql_register_types', function() { 

	register_graphql_mutation( 'viewPopularPost', [

		'inputFields'         => [
			'postId' => [
				'type' => 'Int',
				'description' => __( 'input field' ),
			]
		],
	
		'outputFields'        => [
			'post' => [
				'type' => 'Post',
				'description' => __( 'output field' ),
				'resolve' => function( $payload, $args, $context, $info ) {
								graphql_debug($payload['post']);// I can check I got Post here!
							   return isset( $payload['post'] ) ? $payload['post'] : null;
				}
			]
		],
	

		'mutateAndGetPayload' => function( $input, $context, $info ) {
			$post = get_post($input['postId']);
			return [
				'post' => $post,
			];
		}
	] );

});

I wrote like this, but empty return resolve.

i checked by graphql_debug, and I could know the $payload has correct post object.

but why did i get a something like empty object, and how to resolve WP Post Object.

Please help me 😭

[justlevine]

Hey @jiwon-mun ,

That's because you need to return a WPGraphQL Post model and not the WP_Post object.

Changing your return statement in $config['outputFields']['post']['resolve'] to the following should fix your issue:

- return isset( $payload['post'] ) ? $payload['post'] : null;
+ return isset( $payload['post'] ) ? new \WPGraphQL\Model\Post( $payload['post'] ) : null;

[jiwon-mun]

It works! Thank you :) 🤩