Add an attribute to attachments

1 comment

1. This can be done with two filters, attachment_fields_to_edit and attachment_fields_to_save, which do exactly what their names suggest. Let’s say you wan to add a source field. First, generate the field and fill it with its current value if that exists:

   function wpse133608_add_attachment_location_field( $form_fields, $post ) {
       $field_value = get_post_meta( $post->ID, 'source', true );
       $form_fields['source'] = array(
           'value' => $field_value ? $field_value : '',
           'label' => __( 'Source' ),
           'helps' => __( 'Set a source for this attachment' )
       );
       return $form_fields;
   }
   add_filter( 'attachment_fields_to_edit', 'wpse133608_add_attachment_location_field', 10, 2 );
   

   Then make sure the field is saved if it has content:

   function wpse133608add_image_attachment_fields_to_save( $post, $attachment ) {
       if ( isset( $attachment['source'] ) )
           update_post_meta( $post['ID'], '_source', esc_attr($attachment['source']) );
   
       return $post;
   }
   add_filter("attachment_fields_to_save", "wpse133608_add_image_attachment_fields_to_save", null , 2);
   

   Read more in this extensive tutorial.

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