Id of the current user from the controller (devise)?

Question

Ruby on Rails

I create a gain entry, I want gain.user_id to be equal to the current user. Provided that Devise installed
how to do it? "current_user" helper in controller doesn't work(
@gain = @task.gains.create(params[:gain])

Answer 1

params_gains = params[:gain].merge(:user => current_user)
@gain = @task.gains.create(params_gains)