title: How do form validation in Cakephp?
body: <p>I have been trying to do form validation in cakephp. I have a dropdown menu and I want to set it to required to allow the selection of the item in the dropdown menu first before moving to the next page. However, I am unable to do so.</p>
  
  <p>I would like to know how to do form validation. I read that cakephp 2.4 and above have problem on form validation and mine is cakephp 2.8. </p>
  
  <p>Please explain if should do it in the controller or model? </p>
  
  <p>I have read the cookbook but wasn't help. Still new with the framework, appreciate if someone can help out.</p>