title: How to change dynamically value field of "Generate rows step" in Pentaho data integration, to be used to get data from A rest API
body: <p>I want to access data from a rest API using pentaho data integration and save the result into a table.</p>
  
  <p>I am using the following steps:</p>
  
  <ol>
  <li>Generate rows step</li>
  <li>Rest Client</li>
  <li>JSON input</li>
  <li>select values</li>
  <li>Table output</li>
  </ol>
  
  <p>The API I want to access take a date as an argument.</p>
  
  <p>My Question is here:</p>
  
  <blockquote>
    <p>How can I automatically change date in the url (generate row step) so
    that I can get data of many dates at a time. With one date the
    transformation works fine.</p>
  </blockquote>
  
  <p><a href="https://i.stack.imgur.com/WVfJl.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/WVfJl.png" alt="enter image description here"></a></p>
  
  <p><a href="https://i.stack.imgur.com/JhinP.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/JhinP.png" alt="enter image description here"></a></p>
  
  <p>Note that the first part of the url was intentionally changed.
  Now I want to dynamically change that dates.</p>