Thanks for you help pardeep_d.

I get some results using  "form_tag" and a "submit_tag" like:

<%= form_tag({controller: "myController", action: "myAction"}, method: 
"post") %>

       [Check-box code]

<%= submit_tag %>
<% end %>

Unfortunately, there are still issues:

- First, if I use "submit_tag", as user's information are displayed from 
a loop, I will have many buttons.

If I click on one of them, I get only ONE result, linked to the specific 
user.

- If I use button_to instead of submit_tag, then I get no results ("nil" 
for both lists).

Any ideas please?

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