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<?php
/**
* The post field which allows users to select existing posts.
*
* @package Meta Box
*/
/**
* Post field class.
*/
class RWMB_Post_Field extends RWMB_Object_Choice_Field {
/**
* Normalize parameters for field.
*
* @param array $field Field parameters.
* @return array
*/
public static function normalize( $field ) {
// Set default field args.
$field = parent::normalize( $field );
$field = wp_parse_args( $field, array(
'post_type' => 'post',
'parent' => false,
) );
if ( ! isset( $field['query_args']['post_type'] ) ) {
$field['query_args']['post_type'] = $field['post_type'];
}
/**
* Set default placeholder.
* - If multiple post types: show 'Select a post'.
* - If single post type: show 'Select a %post_type_name%'.
*/
if ( empty( $field['placeholder'] ) ) {
$field['placeholder'] = __( 'Select a post', 'meta-box' );
if ( is_string( $field['query_args']['post_type'] ) && post_type_exists( $field['query_args']['post_type'] ) ) {
$post_type_object = get_post_type_object( $field['query_args']['post_type'] );
// Translators: %s is the post type singular label.
$field['placeholder'] = sprintf( __( 'Select a %s', 'meta-box' ), $post_type_object->labels->singular_name );
}
}
// Set parent option, which will change field name to `parent_id` to save as post parent.
if ( $field['parent'] ) {
$field['multiple'] = false;
$field['field_name'] = 'parent_id';
}
// Set default query args.
$field['query_args'] = wp_parse_args( $field['query_args'], array(
'post_status' => 'publish',
'posts_per_page' => - 1,
) );
return $field;
}
/**
* Get field names of object to be used by walker.
*
* @return array
*/
public static function get_db_fields() {
return array(
'parent' => 'post_parent',
'id' => 'ID',
'label' => 'post_title',
);
}
/**
* Get meta value.
* If field is cloneable, value is saved as a single entry in DB.
* Otherwise value is saved as multiple entries (for backward compatibility).
*
* @see "save" method for better understanding
*
* @param int $post_id Post ID.
* @param bool $saved Is the meta box saved.
* @param array $field Field parameters.
*
* @return mixed
*/
public static function meta( $post_id, $saved, $field ) {
if ( isset( $field['parent'] ) && $field['parent'] ) {
$post = get_post( $post_id );
return $post->post_parent;
}
return parent::meta( $post_id, $saved, $field );
}
/**
* Get options for walker.
*
* @param array $field Field parameters.
* @return array
*/
public static function get_options( $field ) {
$query = new WP_Query( $field['query_args'] );
return $query->have_posts() ? $query->posts : array();
}
/**
* Get option label.
*
* @param array $field Field parameters.
* @param string $value Option value.
*
* @return string
*/
public static function get_option_label( $field, $value ) {
return sprintf(
'<a href="%s" title="%s">%s</a>',
esc_url( get_permalink( $value ) ),
the_title_attribute( array(
'post' => $value,
'echo' => false,
) ),
get_the_title( $value )
);
}
}
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