how to pass session variable to model in RoR?

Question

I used a global variable in my app for passing information before. But I got a problem and thanks everyone here suggested me to store those data in session with database.

Answer 1

Do you need the session variable as part of your model, or just as a flag to determine what to execute?

If the former, you don't need to know where did the parameters originate, just pass the variable as an argument for some call in your method. For example:

@user = User.new(params[:user].merge(:some_attribute => session[:some_key])

and just add the validation as usual in the model.

If you need that to control some flow of the execution, as you mention that should be different for different users, you may need an instance variable in your controller. Something like

class SomeController
  before_filter :set_some_session_variable

  def set_some_session_variable
    @some_variable = session[:some_key]
  end
end

You could use session[:some_key] directly in your view, but is better to set it in an instance variable instead.