title: Django - Create new object in Form, update select box and save it
body: <p>I think what I'm trying to achieve is not hard, but I have no clue how to do it hehehehe !</p>
  
  <p>Basically what I need is the feature that we have in Django Admin, when you are creating a new object, if you have a Foreign Key, you can add new data (opening a pop-up), save it and then the select box updates automatically.</p>
  
  <p>What I have is this form:</p>
  
  <p><a href="https://i.stack.imgur.com/J8Sxq.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/J8Sxq.jpg" alt="enter image description here"></a></p>
  
  <p>I know that would be easy to do it with some Javascript, but my point is, Django has some rules, and as far I know, I can't add new data to a form already created, right? Otherwise Django won't validate this form. How could I achieve this? </p>
  
  <p>PS: "Local" is the select box where I want to add new data. The user should be able to create a new Local on this page, instead of going to another page to do it. Thanks :)</p>