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namespace WPGraphQL\Type\Union;
use GraphQL\Type\Definition\UnionType;
use WPGraphQL\Types;
/**
* Class TermObjectUnionType
*
* In some situations, the type of term cannot be known until query time. The termObjectUnion allows for connections to
* be queried and resolved to a number of types.
*
* @package WPGraphQL\Type\Union
*/
class TermObjectUnionType extends UnionType {
/**
* This holds an array of the possible types that can be resolved by this union
* @var array
*/
private static $possible_types;
/**
* TermObjectUnionType constructor.
*/
public function __construct() {
$config = [
'name' => 'TermObjectUnion',
'types' => function() {
return self::getPossibleTypes();
},
'resolveType' => function( $value ) {
return ! empty( $value->taxonomy ) ? Types::term_object( $value->taxonomy ) : null;
},
];
parent::__construct( $config );
}
/**
* This defines the possible types that can be resolved by this union
*
* @return array|null An array of possible types that can be resolved by the union
*/
public function getPossibleTypes() {
if ( null === self::$possible_types ) {
self::$possible_types = [];
}
$allowed_taxonomies = \WPGraphQL::$allowed_taxonomies;
if ( ! empty( $allowed_taxonomies ) && is_array( $allowed_taxonomies ) ) {
foreach ( $allowed_taxonomies as $allowed_taxonomy ) {
if ( empty( self::$possible_types[ $allowed_taxonomy ] ) ) {
self::$possible_types[ $allowed_taxonomy ] = Types::term_object( $allowed_taxonomy );
}
}
}
/**
* Filter the possible_types as it's possible some systems might set things like "parent_id" to a different
* object than a post_type, and might want to be able to hook in and add a non postObject type to the possible
* resolveTypes.
*
* @param array $possible_types An array of possible types that can be resolved for the union
* @since 0.0.6
*/
self::$possible_types = apply_filters( 'graphql_term_object_union_possible_types', self::$possible_types );
return ! empty( self::$possible_types ) ? self::$possible_types : null;
}
}