How do I print custom user fields?

Question

I am trying to customize the authored by information for all of my nodes that prints the User First and Last Name, which are custom fields on the User Profile.

1. I copied the node.html.twig template into my theme

2. I added the following code to load the user information in my preprocess function

   function blend_preprocess_node(&$variables) {
   
   // Load the current user.
   $user = \Drupal\user\Entity\User::load(\Drupal::currentUser()->id());
   
   // get field data from that user
   $firstname = $user->get('field_first_name')->value;
   $lastname = $user->get('field_last_name')->value;
   
   // some default getters include
   $email = $user->get('mail')->value;
   $name = $user->get('name')->value;
   $uid= $user->get('uid')->value;
   
   }
   

3. I added this code to node.html.twig

   {{ title_prefix }}   {% if not page %}
   <h2{{ title_attributes }}>
     <a href="{{ url }}" rel="bookmark">{{ label }}</a>
   </h2>   {% endif %}   {{ title_suffix }}
   
   {% if display_submitted %}
   
   <div class="posted">
   
       <div class="services-icon">
         {{ content.field_services }}
       </div> 
   
   
     {{ author_picture }}
   
     <div{{ author_attributes }}>
       {% trans %}Submitted by {{ firstname }} {{ lastname }} on {{ date|date("m/d/Y") }}{% endtrans %}
       {{ metadata }}
     </div>
   </div>   {% endif %}
   {# We hide the comments and links now so that we can render them later. #}   <div{{ content_attributes }}>
   {{ content|without('comment', 'links', 'field_tags', 'field_services') }}   </div>
   
   {% if content.field_tags|length and not is_front %}
   {{ content.field_tags }}   {% endif %}
   {{ content.links }}   {{ content.comment }} </article>
   

How do I make variables (mostly fields) from different entities available to print in different template files?

Answer 1

Assuming this information is from the user profile.

You could do the following

blend.theme

function blend_preprocess_node(&$variables){
    $node = $variables['node'];
    $variables['firstname'] = $node->getOwner()->field_first_name->value;
    $variables['lastname'] = $node->getOwner()->field_last_name->value;
}

From there you can use {{ firstname }} and {{lastname}} anywhere in your template.

Answer 2

The accepted answer didn't work for me on Drupal version 8.3.4 and more. Actually the $node = $variables['node'] didn't work so I found out the following method to make it work.

On the .theme file (in this example blend.theme), I used the following code.

function blend_preprocess_node(&$variables){
  $node = \Drupal::routeMatch()->getParameter('node');
  $variables['firstname'] = $node->getOwner()->field_first_name->value;
  $variables['lastname'] = $node->getOwner()->field_last_name->value;
}