If we use resource_controller gem/plugin in Ruby on Rails application, then as per the default configuration, it takes the associated Model name with respective Controller name as,

in app/controllers/posts_controller.rb file,
class PostsController < ResourceController::Base
resource_controller
end

This above configuration will find for Post Model. But if you want to change it to associate it to different model as ‘Comment’ Model, then you can do it as,

class PostsController < ResourceController::Base
resource_controller

private
def model_name
'comment' # Model Name
end
end

Ref. URL – http://jamesgolick.com/resource_controller/rdoc/files/__/README_rdoc.html

Print numbers as Cardinals in Ruby On Rails (like 1st, 2nd, 3rd, 4th and so on….)

Rails has inbuilt function – ordinalize

(1).ordinalize => "1st"
(13).ordinalize => "13th"
(22).ordinalize => "22nd"
(100).ordinalize => "100th"

Also we can write the helper as following,

def number_to_ordinal(num)
num = num.to_i
if (10...20)===num
"#{num}th"
else
g = %w{ th st nd rd th th th th th th }
a = num.to_s
c=a[-1..-1].to_i
a + g[c]
end
end

number_to_ordinal(23) => "23rd"
number_to_ordinal(1) => "1st"

Backup of SVN repository,

svnadmin dump myrepos > dumpfile

Once you give this command, it will create the dumpfile (backup) of the SVN repo with all the LOGs.

Load the SVN dump file on server,

svnadmin load newrepos < dumpfile

Once you give this command, all the data from the dumpfile will be loaded/extracted with all SVN LOGs.

Reference URL – http://chestofbooks.com/computers/revision-control/subversion-svn/Migrating-Repository-Data-Elsewhere-Reposadmin-Maint-Migrate.html

Sometimes we need a lots of test data. Most of the times, we use to write test data in fixtures or we may enter the data manually.

For RubyonRails application, there is a better way to add lots of test data. Yes, we can do this with the help of following gems,

sudo gem install populator
sudo gem install faker

To insert the test (dummy) data, you can create the RAKE task or method as following,

#lib/tasks/populate.rake
namespace :db do
desc "Erase and fill database"
task :populate => :environment do
require 'populator'
require 'faker'

User.populate 10 do |user|
user.firstname = Faker::Name.name
user.lastname = Populator.words(1).titleize
user.about_me = Populator.sentences(2..10)
user.email = Faker::Internet.email
user.phone = Faker::PhoneNumber.phone_number
user.street = Faker::Address.street_address
user.city = Faker::Address.city
user.state = Faker::Address.us_state_abbr
user.zip = Faker::Address.zip_code
end
end
end

This will insert mass records into database in quick time. Also we can set up associations,
We will modify above code for User’s association with Club as,

User.populate 10 do |user|
user.firstname = Faker::Name.name
user.lastname = Populator.words(1).titleize
......
user.zip = Faker::Address.zip_code
Club.populate 5 do |club|
club.user_id = user.id
club.name = Populator.words(3..8).titleize
end
end

Once you are done with writing the method, you can run the following RAKE task,
rake db:populate

For more methods, You can refer – http://populator.rubyforge.org/ for POPULATOR gem and http://faker.rubyforge.org/rdoc/ for FAKER gem.

Reference URL – http://railscasts.com/episodes/126-populating-a-database

Thanks,

How to create rails application for specific rails version ?
If you have multiple Rails versions installed on your application and if you want to create Rails application,

rails demo

then in this case, it will create Rails application with latest version installed on our machine.

If you want to create Rails application for specific rails versions, use following command

rails _2.1.0_ demo

demo – rails application name with version 2.1.0

If you want to display the list ( of users ) with different css-class for alternate record, there is no need to check the odd-even records,

For this, Rails have awesome feature and that is – ‘cycle’

We can use this as,

say we have 2 css classes-blank and white. If want to apply ‘black’ and ‘white’ class for alternate user record, then we have to write the code as,

<% @users.each do |user| %>
<li class="<%= cycle('black', 'white') -%>">
<%= user.name %></li>
<% end %>

Cool feature

Previously I was adding most of the code in one controller…say if there is admin module, and there are different sections in it, then it’s better to add the code in separate controllers – sub-controllers.

Here is the way to create sub-controllers,

ruby script/generate controller admin/users

It will create users_controller.rb in /controllers/admin folder (sub-folder for controller)

Your user controller will look like,

class Admin::UsersController < ApplicationController
end

And to inherit the properties of the parent controller (AdminController), you can change parent controller as AdminController instead ApplicationController

class Admin::UsersController < AdminController
end


Hope this helps.

To copy a file/directory in working directory or in otherdirectory,

svn move SOURCE DESTINATION

if you want to move ‘app’ folder from working directory into /trunk,

svn move app /trunk/app

it will move ‘app’ folder in ‘/trunk/app’ folder.

Similarly to copy the files,
——————————————–
svn copy SOURCE DESTINATION

if you want to copy ‘app’ folder from working directory into /trunk,

svn copy app /trunk/app

it will copy ‘app’ folder in ‘/trunk/app’ folder.