Adding a button on a specific page with backlinks - ruby-on-rails

Question

First post, so i'm a newbie in StackOverflow. I'm trying for several days to make appear a Return button on a page form but only on a specific one.
So, I was advised to use backlink to make it appears.
Here's my code from the form where I want the return button
<% if #backlink.present? %>
<div class="spacer30"></div>
<% if #backlink == 'infos' %>
path = membre_path(menu: 'infos')
<% end %>
<% end %>
<%= link_to "Retour", path, class: "btn-rounded btn-turquoise btn-small" %>
Here's my code controller
def edit
super do |user|
puts "TEST PARAMS BACKLINK #{params[:backlink]}"
#backlink = params[:backlink]
end
end
and my route's :
get 'change_password', to: 'users/registrations#edit'
put 'update' => 'users/registrations#update', :as => 'user_registration'
get 'edit_password', to: 'users/registrations#edit', :as => 'user_edit'
So i should have in my log my PUTS 'TEST PARAMS BACKLINK' but nothing appear, only :
Started GET "/change_password.1?backlink=infos" for ::1 at 2017-10-04 10:07:41 +0200
Processing by Users::RegistrationsController#edit as
Parameters: {"backlink"=>"infos"}
User Load (9.1ms) SELECT "users".* FROM "users" WHERE "users"."id" = $1 ORDER BY "users"."id" ASC LIMIT $2 [["id", 1], ["LIMIT", 1]]
Rendering users/registrations/edit.html.erb within layouts/application
Rendered users/registrations/edit.html.erb within layouts/application (14.4ms)
Rendered shared/_navbar.html.erb (4.0ms)
Rendered shared/_flashes.html.erb (1.1ms)
Completed 200 OK in 231ms (Views: 217.0ms | ActiveRecord: 9.1ms)
Any ideas why it doesn't work?
Many thanks.

Answer 1

I just had to delete some lines, here's what i changed from my registration controller :
def edit
#backlink = params[:backlink]
super
end
This way, it appears exactly the way I wanted to.
Many thanks :)