```ruby
class ApplicationController < ActionController::Base
  # Prevent CSRF attacks by raising an exception.
  # For APIs, you may want to use :null_session instead.
  protect_from_forgery with: :exception
  helper_method :current_user
  def current_user
    @user ||= User.find(session[:user_id]) if session[:user_id]
  end

end
```

Change setting of current user
user
```ruby
class ApplicationController < ActionController::Base
  # Prevent CSRF attacks by raising an exception.
  # For APIs, you may want to use :null_session instead.
  protect_from_forgery with: :exception
  helper_method :current_user
  def current_user
    @user = User.find(session[:user_id]) if session[:user_id]
  end

end
```
assistant