I have created a custom post type called Groups. I would like to provide an option to add Users to these groups in the Group edit page. Any help would be appreciated thank you. P.S: I thought of using the Post-to-Post plugin but I am not sure if that would be the right solution.


You can use the ACF plugin for https://wordpress.org/plugins/advanced-custom-fields/.

Steps need to do:

  1. Download and installed ACF plugin.
  2. Click on Custom Fields link at the left side menu
  3. Add custom field as: enter image description here
  4. Select custom as and publish it: enter image description here
  5. Now add this code in functions.php file as:
function acf_load_color_field_choices( $field ) {    
    // reset choices
    $field['choices'] = array();
  $blogusers = get_users();
  $field['choices'][0] = "Select User";
  foreach($blogusers as $user){
            // append to choices
            $field['choices'][ $user->ID ] = $user->display_name;
    // return the field
    return $field;    
add_filter('acf/load_field/name=select_user_for_post', 'acf_load_color_field_choices');
  1. Now if you create Groups post you will see users list in a dropdown as:

enter image description here

Important details:

  1. get user list

  2. Dynamically populate a select field’s choices

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