title: access model data in custom validation rule
body: <p>I have custom validation rule:</p>
  
  <pre><code>public function customRule($check)
  {
  
  
  }
  </code></pre>
  
  <p>Inside this rule I would like to access some model data (in database). Of course I can do it like this: </p>
  
  <pre><code>$this-&gt;id = 23; 
  $this-&gt;read();
  </code></pre>
  
  <p>But then all the data in current model will be overidden by <code>read</code> function (I mean <code>$this-&gt;data[$this-&gt;alias][...]</code> is overridden.</p>
  
  <p>How I can get this data?</p>