title: Symfony automatic filling a field of my form by a value from database
body: <p>I am using the framework symfony 5 for my website and I have implemented a normal authentication system. I have 2 entities (Users and Patients) and when I enter a new patient through the form, a field of this form must be automatically filled in (and not shown) by the id of the user who has logged in and is making this addition. Who can help me?</p>
  <p>The field of my entity that I have to fill is this one:
  <a href="https://i.stack.imgur.com/TkoQz.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/TkoQz.jpg" alt="enter image description here" /></a></p>
  <p>My action in the controller is this one:<a href="https://i.stack.imgur.com/WQMYg.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/WQMYg.jpg" alt="enter image description here" /></a></p>