title: Laravel validation for two column with same value exist on table
body: <p>The actual scenario is  i have to check if two same column value exist on table or not 
  For example first I input  <code>user_id = 1</code> and <code>rv_id = 2</code></p>
  
  <p>I should not store same sequence value again <code>(user_id = 1 and rv_id = 2)</code> 
  but I can store  <code>user_id = 1 and rv_id = 3</code> or <code>user_id =1 and rv_id =1</code> </p>
  
  <pre><code>$request-&gt;validate([
  
              'rv_id'     =&gt; 'required|unique:favorite_unites,rv_id,user_id|exists:rvs,id', 
              'user_id'   =&gt; 'required|unique:favorite_unites,user_id,rv_id|exists:users,id',
  
          ]);
  </code></pre>