title: Prepopulate form fields
body: <p>I have a user creation form (on top of Symfony Form component), it's used on some different pages and is loaded via AJAX. </p>
  
  <p>An initial request contains information we already know about a user-to-be, e.g. if form is loaded from a manager creation page for the "X" company, we already know that a user has a role = "manager" and company = "X". And the corresponding form fields must be removed/hidden from the form and underlying user object must be provided with these parameters (a role field must be set to "manager", a company field must be set to "X").</p>
  
  <p>How can it be achieved?</p>