Hi, I am quite new to ROR.I am trying to create a rails simple application that has informations about Books and Subjects.Srangely, I finished creating a basic application, and it worked fine. But then , I just tried to add some more values in the database, and faced problem with migration, that just made me crazy. SO I deleted the database and did the database and migration thing all over again without touching rest of the codes.Now the application runs, but when I click on the subject name, it show error, although it was working well before.Can someone help me please in this regards ????
The ERROR is : NoMethodError in Book#show_subjects Showing book/show_subjects.rhtml where line #1 raised: You have a nil object when you didn't expect it! The error occurred while evaluating nil.name Extracted source (around line #1): 1: <h1><%= @subject.name -%></h1> 2: <ul> 3: <% @subject.books.each do |c| %> 4: <li><%= link_to c.title, :action => "show", :id => c.id -%></li> I have two tables in my database : books and subjects The Controller is class BookController < ApplicationController layout 'standard' def list @books = Book.find(:all) end def show @book = Book.find(params[:id]) end def new @book = Book.new @subjects = Subject.find(:all) end def create @book = Book.new(params[:book]) if @book.save redirect_to :action => 'list' else @subjects = Subject.find(:all, :order => "name") render :action => 'new' end end def edit @book = Book.find(params[:id]) @subjects = Subject.find(:all) end def update @book = Book.find(params[:id]) if @book.update_attributes(params[:book]) redirect_to :action => 'show', :id => @book else @subjects = Subject.find(:all) render :action => 'edit' end end def delete Book.find(params[:id]).destroy redirect_to :action => 'list' end def show_subjects @subjects = Subject.find(params[:id]) end end The show_subjects.rhtml file is : <h1><%= @subject.name -%></h1> <ul> <% @subject.books.each do |c| %> <li><%= link_to c.title, :action => "show", :id => c.id -%></li> <% end %> </ul> -- Posted via http://www.ruby-forum.com/. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk@googlegroups.com To unsubscribe from this group, send email to rubyonrails-talk+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---