murugan-r

class Order < ActiveRecord::Base
  has_many :order_items

  validates_length_of :order_items, :minimum => 1, :message => :empty
  accepts_nested_attributes_for :order_items
end

#en.yml
  activerecord:

murugan-r

<tr>
<td><%=@key.split(".").drop(1) %></td>
<td><%= @value%></td>
</tr>

murugan-r

Patched ruby 1.9.3-p194 for 30% faster rails boot

Overview

This script installs a patched version of ruby 1.9.3-p194 with boot-time performance improvements (#66 and #68), and runtime performance improvements (#83 and #84). It also includes the new backported GC from ruby-trunk.

Many thanks to funny-falcon for the performance patches.

• http://github.com/ruby/ruby/pull/66
• http://github.com/ruby/ruby/pull/68

murugan-r

This is how we test that all translation keys match up between locales.

Stuff that only goes in one locale (such as an admin section) or that can't be translated yet (if you use external translators) can simply go in files that don't match the path "config/locales/??.yml", like "config/locales/wip.fo.yml".

murugan-r

# Ways to execute a shell script in Ruby
# Example Script - Joseph Pecoraro

cmd = "echo 'hi'" # Sample string that can be used

# 1. Kernel#` - commonly called backticks - `cmd` 
# This is like many other languages, including bash, PHP, and Perl
#  Returns the result of the shell command
#  Docs: http://ruby-doc.org/core/classes/Kernel.html#M001111

murugan-r

#!/usr/bin/ruby1.9.1 -Kw
# -*- coding: utf-8 -*-

class Edge
  attr_accessor :src, :dst, :length
  
  def initialize(src, dst, length = 1)
    @src = src
    @dst = dst
    @length = length

murugan-r

Rails 4 Differences

Chapter 1

No differences.

Chapter 2

• root :to => "dashboard#index" is now root "dashboard#index"`
• Need to permit parameters within Subscribem::AccountsController

murugan-r

# put the cookbook path in solo.rb file.
echo 'cookbook_path ["/opt/aws/opsworks/current/site-cookbooks"]' > solo.rb

# create json file incase if you want use the attributes from opsworks.
opsworks-agent-cli get_json > attributes.json

#run chef-solo
/opt/aws/opsworks/current/bin/chef-solo -c solo.rb -o cookbook_name::default -j attributes.json --log_level=debug

murugan-r

curl -kL http://install.perlbrew.pl | sed "/\$PERLBREWDOWNLOAD/{N;s|$|sed -i -r '/@INC/ s/([)][}])/ vendorlib vendorarch\\\1/' \\\$LOCALINSTALLER\n|}" | bash

murugan-r

belongs_to:

1. Assigning an object to a belongs_to association does not automatically save the object. It does not save the associated object either.

has_one:

1. When you assign an object to a has_one association, that object is automatically saved (in order to update its foreign key).
2. In addition, any object being replaced is also automatically saved, because its foreign key will change too
3. If either of these saves fails due to validation errors, then the assignment statement returns false and the assignment itself is cancelled.
4. If the parent object (the one declaring the has_one association) is unsaved (that is, new_record? returns true) then the child objects are not saved. They will automatically when the parent object is saved.