rmw

module SingleTableInheritance

  def self.included(klass)
    klass.extend ClassMethods
  end

  def class_type=(value)
    self[:type] = value
  end

rmw

class Address < ActiveRecord::Base
  belongs_to :addressable, :polymorphic => true

  #use these instead of validates_presence_of :addressable
  validates_presence_of :addressable_type
  validates_presence_of :addressable_id, :unless => Proc.new { |a|
    #if it's a new record and addressable is nil and addressable_type is set
    #   then try to find the addressable object in the ObjectSpace
    #       if the addressable object exists, then we're valid;
    #       if not, let validates_presence_of do it's thing

rmw

beforeEach(function() {
  var self = this; 
  //contacts
  this.contacts = new App.Collections.Contacts();
  _.each(this.fixtures.Contacts.valid, function(c) {
    self.contacts.add(new Contact(c));
  });
  this.contactsCollectionStub = 
      sinon.stub(App.Collections, 'Contacts')
         .returns(this.contacts);

rmw

// Java  
public boolean isEmpty(String s) {  
  return s.length() == 0;  
}  

# ruby  
def empty?(s)  
  return s.size == 0  
end  

rmw

App.Collections.Notes = Backbone.Collection.extend({
  model: Note,
  url: '/notes.json',
  comparator : function(note) {
    //ordering by status (alphabetically asc) and id (numeric desc)
    var stat = note.get('status');
    var note_id = note.get('id');
    var sort_order = (stat.charCodeAt(0) * 100000) - note_id;
    return sort_order;
  }

rmw

my_hash.sort { |h| h["name"].upcase }

rmw

class Hash
    # options:
  #   :exclude => [keys] - keys need to be symbols 
  def to_ostruct_recursive(options = {})
    convert_to_ostruct_recursive(self, options) 
  end

  private
    def convert_to_ostruct_recursive(obj, options)
      result = obj

rmw

class Hash
  def with_sym_keys
    self.inject({}) { |memo, (k,v)| memo[k.to_sym] = v; memo }
  end
end

rmw

 def cache_should_receive_fetch(return_val = nil)
    Rails.cache.should_receive(:fetch).
      with(cache_key, { :race_condition_ttl => 10}).
      tap { |o| o.and_return(return_val) unless return_val.nil? }
  end

rmw

var img = $('img');
var default_url = "http://example.org/images/img.jpg";
var img_url = "http://example.org/images/" + some_variable + ".jpg";
img.error(function() {
  $(this).attr('src', default_url) 
});
img.attr('src', img_url);