Every link_to on my rails 4 application is being called twice - ruby-on-rails

Question

I'm experiencing some unusual behaviour with my Rails 4 Application. Every single-time I click on a link_to inside my views, my controllers actions are being called twice. For example:
In my root_url I have this standard call for users_profile:
<%= link_to('User Profile', users_profile_path, :class => "logout-button") %>
When I click this link, my console shows the following output:
Started GET "/users/profile" for 127.0.0.1 at 2013-11-25 20:45:53 -0200
Processing by Users::SessionsController#profile as HTML
User Load (0.7ms) SELECT "users".* FROM "users" WHERE "users"."id" = 45 ORDER BY "users"."id" ASC LIMIT 1
InvestorProfile Load (0.5ms) SELECT "investor_profiles".* FROM "investor_profiles" WHERE "investor_profiles"."user_id" = $1 ORDER BY "investor_profiles"."id" ASC LIMIT 1 [["user_id", 45]]
EmployeeProfile Load (0.5ms) SELECT "employee_profiles".* FROM "employee_profiles" WHERE "employee_profiles"."user_id" = $1 ORDER BY "employee_profiles"."id" ASC LIMIT 1 [["user_id", 45]]
Rendered users/sessions/_investor_setup.html.erb (3.9ms)
Rendered users/sessions/profile.html.erb within layouts/application (5.2ms)
Completed 200 OK in 19ms (Views: 11.2ms | ActiveRecord: 2.5ms)
Started GET "/users/profile" for 127.0.0.1 at 2013-11-25 20:45:53 -0200
Processing by Users::SessionsController#profile as HTML
User Load (0.3ms) SELECT "users".* FROM "users" WHERE "users"."id" = 45 ORDER BY "users"."id" ASC LIMIT 1
InvestorProfile Load (0.3ms) SELECT "investor_profiles".* FROM "investor_profiles" WHERE "investor_profiles"."user_id" = $1 ORDER BY "investor_profiles"."id" ASC LIMIT 1 [["user_id", 45]]
EmployeeProfile Load (0.2ms) SELECT "employee_profiles".* FROM "employee_profiles" WHERE "employee_profiles"."user_id" = $1 ORDER BY "employee_profiles"."id" ASC LIMIT 1 [["user_id", 45]]
Rendered users/sessions/_investor_setup.html.erb (3.3ms)
Rendered users/sessions/profile.html.erb within layouts/application (4.1ms)
Completed 200 OK in 12ms (Views: 7.5ms | ActiveRecord: 1.2ms)
People often have this behaviour when there's a remote (JS for example) calling the method, but this is not my case. the weirdest part is that, if I put the direct URL to the users_profile_path on my browser. I only get one request on my rails console:
Started GET "/users/profile" for 127.0.0.1 at 2013-11-25 20:48:17 -0200
Processing by Users::SessionsController#profile as HTML
User Load (0.3ms) SELECT "users".* FROM "users" WHERE "users"."id" = 45 ORDER BY "users"."id" ASC LIMIT 1
InvestorProfile Load (0.3ms) SELECT "investor_profiles".* FROM "investor_profiles" WHERE "investor_profiles"."user_id" = $1 ORDER BY "investor_profiles"."id" ASC LIMIT 1 [["user_id", 45]]
EmployeeProfile Load (0.2ms) SELECT "employee_profiles".* FROM "employee_profiles" WHERE "employee_profiles"."user_id" = $1 ORDER BY "employee_profiles"."id" ASC LIMIT 1 [["user_id", 45]]
Rendered users/sessions/_investor_setup.html.erb (3.4ms)
Rendered users/sessions/profile.html.erb within layouts/application (4.2ms)
Completed 200 OK in 12ms (Views: 7.7ms | ActiveRecord: 1.1ms)
I'm getting this same result for every link inside my application, not only this one.

Answer 1

Rails 5/6
When I was clicking on a link, the whole controller was being called twice. I tried the accepted answer, but it does not work for me, so I just set turbolinks: false as below:
<%= link_to("Demo", #user, data: { turbolinks: false } ) %>

Answer 2

If you would like your app to still make use of Turbolinks then "Opting out of Turbolinks" on the code that is giving you problems is the way to go; just add data-no-turbolink.
I was having problems with using Bootstrap 3 and adding that fixed it. For example;
<li class="list-group-item" data-no-turbolink>
<%= link_to download_path(item) do %>
<button type="button" class="btn btn-success">Download</button>
<% end %>
</li>

Answer 3

I actually managed to solve this on my own.
There's a default gem that is installed with rails 4.0, it is called Turbolinks*.
For some reason, the javascript used in this gem* was causing the doubled requests on my server. That's why only GET requests were behaving like this, and POST requests were normal.
I still don't fully understand why gem* causes that, but after I removed the following line from my application.js file, the doubled requests stopped.
=// require turbolinks

Answer 4

Another solution is to add data-no-turbolink to the tag.
More info here: http://blog.flightswithfriends.com/post/53943440505/how-to-disable-turbolinks-in-rails-4