I'm pretty new to the REST API so please excuse any stupid questions. I'm currently trying to develop a plugin and therefore I need to register a custom post type including a custom field. This is all done and seems to work. The problem is that the callback functions aren't working. I'm not sure about the get_post_meta_cb but the update callback simply does nothing! I've tried pretty much everyting I could find but nothing worked.
Here's the code:
// Define the CPT labels
private function define_cpt_labels()
{
$labels = [
'name' => _x( 'Variable Offers', 'post type general name', $this->cptTextDomain ),
'singular_name' => _x( 'Varaible Offer', 'post type singular name', $this->cptTextDomain ),
'menu_name' => _x( 'Variable Offers', 'admin menu', $this->cptTextDomain ),
'name_admin_bar' => _x( 'Variable Offer', 'add new on admin bar', $this->cptTextDomain ),
'add_new' => _x( 'Add New', 'book', $this->cptTextDomain ),
'add_new_item' => __( 'Add New Variale Offer', $this->cptTextDomain ),
'new_item' => __( 'New Variable Offer', $this->cptTextDomain ),
'edit_item' => __( 'Edit Variable Offer', $this->cptTextDomain ),
'view_item' => __( 'View Variable Offer', $this->cptTextDomain ),
'all_items' => __( 'All Variable Offers', $this->cptTextDomain ),
'search_items' => __( 'Search Variable Offers', $this->cptTextDomain ),
'parent_item_colon' => __( 'Parent Variable Offers:', $this->cptTextDomain ),
'not_found' => __( 'No Variable Offers found.', $this->cptTextDomain ),
'not_found_in_trash' => __( 'No Variable Offers found in Trash.', $this->cptTextDomain )
];
return $labels;
}
// Define CPT arguments
private function define_cpt_agruments()
{
$args = [
'labels' => $this->define_cpt_labels(),
'description' => __( 'Description.', $this->cptTextDomain ),
'public' => true,
'publicly_queryable' => true,
'show_ui' => true,
'show_in_menu' => true,
'query_var' => true,
'rewrite' => ['slug' => self::CPT_SLUG],
'capability_type' => 'post',
'has_archive' => true,
'hierarchical' => false,
'menu_position' => null,
'show_in_rest' => true,
'rest_base' => self::CPT_SLUG,
'rest_controller_class' => 'WP_REST_Posts_Controller'
];
return $args;
}
public function registerCpt()
{
add_action( 'init', [$this, 'register_cpt'] );
add_action( 'rest_api_init', [$this, 'register_cpt_fields'] );
}
public function register_cpt()
{
register_post_type( self::CPT_SLUG, $this->define_cpt_agruments());
}
public function register_cpt_fields() {
register_rest_field( self::CPT_SLUG, 'cpt_meta_fields', array(
'get_callback' => [$this, 'get_post_meta_cb'],
'update_callback' => [$this, 'update_post_meta_cb'],
'schema' => null
));
}
public function get_post_meta_cb( $object, $field_name, $request ) {
return get_post_meta( $object->ID, $field_name );
}
public function update_post_meta_cb( $value, $object, $field_name ) {
return update_post_meta( $object->ID, $field_name, $value );
}
All that is defined in a class. The constant is defined as CPT_SLUG = 'variable_offer'. I use Postman to test the requests. When I do
/wp-json/wp/v2/variable_offeror/wp-json/wp/v2/variable_offer/5
I get the CPT with ID 5 in both cases. When I put any other number I get the corresponding post (guess that is how it is supposed to be). Here's a Postman output:
As you can see the custom field is there. Whenever I try someting like /wp-json/wp/v2/variable_offer/5/cpt_meta_fields (which I assumed to be the request in order to get the meta field only) it says there is no such route registered.
When I try to update the field nothing happens! The POST request is /wp-json/wp/v2/variable_offer/7?cpt_meta_fields=9.
Can anyone tell me what I'm doing wrong?
Thanks!