Question

hi im just wondering if why the session cant find my reservation upon refresh and used it in a other controller

this is my applicationcontroller

  helper :all # include all helpers, all the time


     private
 def current_reservation
   @reservation ||= Reservation.find(session[:reservation_id]) if session[:reservation_id]
   #last assigned value will be returned as default.
 end

 def create_reservation_session(id)
   session[:reservation_id] = id
 end

 def destroy_reservation_session
   session[:reservation_id] = nil
 end

and im trying to us it here

 def new
   @book_reservation = BookReservation.new
 end

def create
  @reservation = current_reservation
  @book_reservation=@reservation.build_book_reservation(params[:book_reservation])
  if @book_reservation.save
    #If success set session
    create_reservation_session(@reservation.id)
    #redirect_to root_url, :notice => "Successfully created book reservation."
  else
    render :action => 'new'
  end
 end

it raises undefined methodbuild_book_reservation’ for nil:NilClass` error

---

model/book_reservation.rb

 belongs_to :reservation

model/reservation.rb

has_one :book_reservation

Answer 1

Cause of the error is you never set session but you tried to access it.In your application controller use

private
 def current_reservation
   @reservation ||= Reservation.find(session[:reservation_id]) if session[:reservation_id]
   #last assigned value will be returned as default.
 end

 def create_reservation_session(id)
   session[:reservation_id] = id
 end

 def destroy_reservation_session
   session[:reservation_id] = nil
 end

In your controller

 def new
   @book_reservation = BookReservation.new
 end

def create
  @reservation = Reservation.find(params[:reservation_id])
  if @reservation
    @book_reservation=@reservation.build_book_reservation(params[:book_reservation])
    if @book_reservation.save
      #If success set session
      create_reservation_session(@reservation.id)
      #redirect_to root_url, :notice => "Successfully created book reservation."
    else
      render :action => 'new'
    end
   else
      render :action => 'new'
   end

Then whenever you need you can use current_reservation.