Add a form to the list output of a view Assume that I've created a view that outputs a list of cars. For each car, I display the name and the age of the car. This is all done with the Drupal UI. Now I'd like to add a simple button (Set as favorite) at the end of each line that when clicked saves the ID of the chosen car in a user's session variable. So my view table should look like the following:

Name Age Button
car1 23  'set as favorite'
car2 10  'set as favorite'


I am not asking about the session-variable part, but only how I can alter the view output to add a simple button to each row of the list output (I bet it'll be a form in each row).

I've done a lot of reading and I bet this could be done with hook_views_data_alter or some other hook_views_* but I'm not proceeding. I've already tried drop-buttons as suggested on Drupal 8 Add custom action buttons to a view, but that does not solve the things I need. I need the car's ID I want to save in a session variable, so basically I need a form functionality.
You probably can do this with just a Global custom text field and some hidden view fields.

E.g.:


Add car id to the view but exclude from view. 
Move this to the top of the list. 
Add a global custom text field for your Favorite button using the replacement values.  Could be something like:

&lt;a class="btn btn-success" href="/add/favorite/{{ carId }}?destination=/view/cars"&gt;Add as Favorite&lt;/a&gt;


Notes: 

Classes are bootstrap specific.

Href is the code to set the favorite.

Destination string is Drupal way to circle back to view.