lass, this returns the suitable family name as String.</p>


  </div>
</div>
<div class="tags">
  <p class="tag_title">Parameters:</p>
<ul class="param">
  
    <li>
      
        <span class='name'>model_or_family_name_or_cst</span>
      
      
        <span class='type'>(<tt>String</tt>, <tt>Symbol</tt>, <tt>ApplicationRecord</tt>)</span>
      
      
      
        &mdash;
        <div class='inline'>
<p>Either the family that contains the requested component, or an instance implementing <code>model_