File list (file upload) from the front end using WP REST API

Dears,

I already managed to update/create a custom post type with custom fields from the front end using the WP REST API. Now I am trying to add a multi image uploader to the form using the field type: file_list but with no success.

The important thing in WP API is to expose the custom fields to the API. I managed to do that for a simple custom field like text: Say the key is “_item_price” and the post type is “forsale”

add_action( 'rest_api_init', function() {
  register_api_field( 'forsale',
    '_item_price',
    array(
      'get_callback'	=> 'slug_get_itemprice',
      'update_callback'	=> 'slug_update_itemprice',
      'schema'		=> null
    )
  );
});

function slug_get_itemprice( $object, $field_name, $request ) {
  return get_post_meta( $object['id'], $field_name );
} // function slug_get_itemprice

function slug_update_itemprice( $value, $object, $field_name ) {
  return update_post_meta( $object->ID, $field_name, strip_tags( $value)
);
} // function slug_update_itemprice

That works fine, I can save a new item price of a product from the front end AJAX with something easy like:

formData.append('_item_price', price);

Now I would like to do the same with a file_list field say it is key is “_item_images”, but I think I am stuck with the update_post_meta since I am not sure how you save this type of data.

Your help is appreciated.

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