Code

// @todo move this to after pre-save preparations
        // Verify unique fields
        if ( 1 == pods_var( 'unique', $options[ 'options' ], 0 ) && '' !== $value && null !== $value && array() !== $value && 0 !== $value && '0' !== $value ) {
            if ( empty( $pod ) )
                return false;

            if ( !in_array( $type, $tableless_field_types ) ) {
                $exclude = '';

                if ( !empty( $id ) )
                    $exclude = "AND `id` != {$id}";

                $check = false;

                $check_value = pods_sanitize( $value );

                // @todo handle meta-based fields
                // Trigger an error if not unique
                if ( 'table' == $pod[ 'storage' ] )
                    $check = pods_query( "SELECT `id` FROM `@wp_pods_" . $pod[ 'name' ] . "` WHERE `{$field}` = '{$check_value}' {$exclude} LIMIT 1", $this );

                if ( !empty( $check ) )
                    return pods_error( sprintf( __( '%s needs to be unique', 'pods' ), $label ), $this );
            }
            else {
                // @todo handle tableless check
            }