title: Transforming json with lift
body: <p>how easily i can transform data ? 
  I can searching data which interesting me, f. ex:</p>
  
  <pre><code>json \\ fieldName1 \\ fieldName2 \\ fieldName3
  </code></pre>
  
  <p>But how i can of this search modify value? f. ex</p>
  
  <pre><code>json transform{
    case JField(x,y) =&gt; JField(x, z)
  }
  </code></pre>