title: How to populate many to many relationship
body: <p>I have a MANY-to-MANY relation between two models. But I cannot figure out how to create a form or table to add records to a many to many relation. I am using Google Drive Tables. </p>
  
  <p>I tried to see if the relation is well set, I exported the data and manually populated the keys in the sheet created for the many to many relation. I checked  using dropdowns to filter data and it works well. </p>
  
  <p>This is probably basic but I just can't find out how to do it. Please help.</p>
  
  <p>Mauricio</p>