Rails4从gem访问参数和会话

Question

I am building a gem that needs to access GET params and current session.

Module MyGem
    class MyClass
        def write_to_session
            session[:user_id] = nil if params[:logout]
        end
    end
end

The code above just doesn't work because sessions and params are accessible only in the controller. In another similar question someone suggested to pass params to the class

Module MyGem
    class MyClass
        def initialize(params)
            @params = params
        end

        def write_to_session
            if @params[:param]
                #Do stuff...
            end
        end
    end

But I wonder if it's possible to just have those variables without passing them end

Answer 1

Manipulating a session in a class is fine - it's just another storage location. Better to abstract it and not clutter up the controller code.

Just initialize the class with a session

def initialize(session, params)

Then do everything you need