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>
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