Scaffolding in Rails

create new project

rails new NewRORProject
cd NewRORProject

generate  model , view , controller for posts table

rails generate scaffold Post name:string title:string content:text

ROR – Turn off layout for one of action

in controller

  layout 'application', :except => :view

OR

in action

def view
    ...
    render :layout => false
end

disable layout in Ruby on rails

to disable one function

add this at the end of function

respond_to do |format|
format.html { render :layout => false } # your-action.html.erb
end

 

== to disable layout for all controller functions

add this to the top of controller file

layout false

Install Ruby on Rails on CentOS

Install Ruby

 yum install ruby

install Ruby dependancies.

yum install gcc g++ make automake autoconf curl-devel openssl-devel zlib-devel httpd-devel apr-devel apr-util-devel sqlite-devel
yum install ruby-rdoc ruby-devel

Install Ruby Gems

yum install rubygems

Install Rails

gem update

 gem update --system

then install rails

gem install rails

for check version try

gem install rails -V

belong to as drop down list in Rails

to view the belong to as select option in add or edit view

use this the new edit view page

<%= f.select :category_id, Category.all.collect {|p| [ p.name, p.id ] } %>

Add column to model, ruby on Rails

add category_id column to posts table

rails g migration add_category_id_to_posts category_id:integer

You ought to edit automatically generated migration and add line on the end of change method:

add_index :posts, :category_id
then run : rake db:migrate

----------------------------
if there is aproblem in saving new fields to database 

you must permit it in the controller

like this

def user_posts_params

params.require(:user_posts).permit(:user_id, :category_id)

end

and this in the model 

attr_accessible :user_id, :category_id