title: make a One to Many Relation in django
body: <p>I am trying to make a one-to-many relation in django.</p>
  
  <p>In my model I have a class Person and a class Group and the relation I want to make is that one Group can have N people inside, and a group cann't exist without at least one person inside</p>
  
  <p>In a MER diagram it would be like(imagine these are entities and relations)</p>
  
  <p>|group|1====&lt;>-----N|person|</p>