_mocks.isnull.php

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<?php
namespace GV\Mocks;

/**
 * Gravity Forms GF_Query does not support NULL condition clauses.
 *
 * Implement them as needed.
 */
class GF_Query_Condition_IS_NULL extends \GF_Query_Condition {
    private $override_placeholder = '{GF_Query_Condition_IS_NULL_override}';

    public function __construct( $left = null, $operator = null, $right = null ) {
        parent::__construct( $left, self::EQ, new \GF_Query_Literal( $this->override_placeholder ) );
    }

    public function sql( $query ) {
        return str_replace( "= '{$this->override_placeholder}'", 'IS NULL', parent::sql( $query ) );
    }
}