Start server with debugging enabled
$ script/server --debugger
 
Start server with debugging enabled - specify environment
$ script/server --debugger RAILS_ENV=production
 
 
Create database
$ rake db:create
 
Run database migrations
$ rake db:migrate
 
Drop database
$ rake db:drop
 
Rollback database migration
$ rake db:rollback
 
Install required gems
$ sudo rake gem:install
 
View routes 
$ rake routes
 
Enter the console with specified environment
$ script/console
$ script/console development
$ script/console test
$ script/console production

Clone database for testing
$ rake db:test:clone
 
Bootstrap Rspec
$ script/generate rspec
 
Bootstrap Cucumber
$ script/generate cucumber --rspec --capybara
 
Generate Rspec model
$ script/generate rspec_model singularmodelname
 
Generate Rspec controller
$ script/generate rspec_controller pluralmodelname
 
Run autotest
$ autotest

Install gems
$ sudo gem install gemname
 
Uninstall gems
$ sudo gem uninstall gemname
 
Reinstall gems
$ sudo gem pristine --all
 
Remove old gems
$ sudo gem clean

Generate migration
$ script/generate migration the_migration_name

public/javascripts/uploadify/jquery.uploadify-2.1.0.min.js
public/javascripts/uploadify/uploadify.swf
public/javascripts/uploadify/swfobject.js
 
public/images/cancel.png
 
public/stylesheets/uploadify.css

require 'rack/utils' 
class FlashSessionCookieMiddleware 
  def initialize(app, session_key = '_session_id') 
    @app = app 
    @session_key = session_key 
  end 
 
  def call(env) 
    if env['HTTP_USER_AGENT'] =~ /^(Adobe|Shockwave) Flash/ 
      req = Rack::Request.new(env) 
      env['HTTP_COOKIE'] = "#{@session_key}=#{req.params[@session_key]}".freeze unless req.params[@session_key].nil? 
    end 
    @app.call(env) 
  end 
end

ActionController::Dispatcher.middleware.insert_before(ActionController::Base.session_store, FlashSessionCookieMiddleware, ActionController::Base.session_options[:key])

Rails::Initializer.run do |config|
 
  config.gem 'mime-types', :lib => 'mime/types'
  config.gem 'paperclip' 
 
  %w(middleware).each do |dir| 
    config.load_paths << "#{RAILS_ROOT}/app/#{dir}" 
  end
end

class CreateImages < ActiveRecord::Migration
  def self.up
    create_table :images do |t|
      t.integer :attachable_id
      t.string :description  
      t.string :data_file_name  
      t.string :data_content_type  
      t.integer :data_file_size  
      t.datetime :data_updated_at
      t.string :parent  
    end
  end
 
  def self.down
    drop_table :images
  end
end

has_many :photos, :dependent => :destroy, :foreign_key => :attachable_id

belongs_to :album, :foreign_key => :attachable_id
 
has_attached_file :data, 
      :url => "/assets/images/:id/:style/:basename.:extension",
      :path => ":rails_root/public/assets/images/:id/:style/:basename.:extension",
      :styles => { 
      :large => "800x800>", 
      :medium => "300x300>", 
      :thumb => "100x100#"}
 
validates_attachment_presence :data
validates_attachment_size :data, :less_than => 2.megabytes  
validates_attachment_content_type :data, :content_type => ['image/jpeg', 'image/jpg', 'image/png', 'image/gif']

class PhotosController < ApplicationController 
  def create
 
    newparams = coerce(params) 
    @photo = Photo.new(newparams[:upload]) 
 
    // so this photo can belong to other models other than album
    @parent = @photo.parent.constantize.find(@photo.attachable_id)
 
    if @photo.save
      flash[:notice] = "Successfully uploaded photo."
      respond_to do |format| 
        format.html {redirect_to @parent} 
        format.json  { render :json => { :result => 'success', :upload => photo_path(@photo) } } 
      end 
    else
      flash[:notice] = "Only gif, jpg or png files allowed"
      respond_to do |format| 
        format.html {redirect_to @parent} 
        format.json  { render :json => { :result => 'failed'} } 
      end
    end
 
  end
 
  def show
    @photo = Photo.find(params[:id])    
  end
 
  def coerce(params) 
    if params[:upload].nil? 
      h = Hash.new 
      h[:upload] = Hash.new 
      h[:upload][:attachable_id] = params[:attachable_id] 
      h[:upload][:parent] = params[:parent] 
      h[:upload][:data] = params[:Filedata] 
      h[:upload][:data].content_type =  MIME::Types.type_for(h[:upload][:data].original_filename).to_s 
      h 
    else 
      params 
    end 
  end
end

<%= stylesheet_link_tag "uploadify"  %>
<%= javascript_include_tag "uploadify/swfobject", "uploadify/jquery.uploadify.v2.1.0.min.js" %>
 
<%- session_key_name = ActionController::Base.session_options[:key] -%>
 
<script type="text/javascript" charset="utf-8"> 
jQuery.noConflict();
 
jQuery().ready(function() { 
   jQuery('#photo_upload').click(function(event){ 
      event.preventDefault(); 
   }); 
 
  jQuery('#photo_upload').uploadify({ 
 
    'uploader'    : '/javascripts/uploadify/uploadify.swf', 
    'script'      : '/cms/photos', 
    'multi'       : true, 
    'cancelImg' : '/photos/cancel.png',
 
    onComplete : function(event, queueID, fileObj, response, data) { 
	var dat = eval('(' + response + ')'); 
	if (dat.result=='success'){
 	  jQuery.getScript(dat.upload);
        }else{
	  alert("Only .jpg, .gif, .png files under 2MB allowed. ")
	}
    }, 
 
    'scriptData' : { 'format' : 'json', 
      '<%= session_key_name %>' : encodeURIComponent('<%= u cookies[session_key_name] %>'), 
      'authenticity_token' : encodeURIComponent('<%= u form_authenticity_token if protect_against_forgery? %>'), 
      'attachable_id' 	: '<%= @album.id %>',
      'parent' 	: 'Album'} 
    }); 
    jQuery('#photo_submit').click(function(event){ 
      event.preventDefault(); 
      jQuery('#photo_upload').uploadifyUpload(); 
    }); 
  }); 
</script>
 
<% form_for Image.new(:attachable_id => @deal.id), :html => { :multipart => true } do |f| %>
	<div class="image-uploader">
		<%= f.file_field :data, :id => 'image_upload'  %>
		<%= f.submit "Upload Images", :id => 'image_submit'%>
	</div>
<% end %>

@users.collect{|u| u.name}.join(', ')

@users.collect(&:name).to_sentence

$ script/plugin install git://github.com/rails/acts_as_tree.git

acts_as_tree :order => 'name'

acts_as_tree
============
 
Specify this +acts_as+ extension if you want to model a tree structure by providing a parent association and a children
association. This requires that you have a foreign key column, which by default is called +parent_id+.
 
  class Category < ActiveRecord::Base
    acts_as_tree :order => "name"
  end
 
  Example:
  root
   \_ child1
        \_ subchild1
        \_ subchild2
 
  root      = Category.create("name" => "root")
  child1    = root.children.create("name" => "child1")
  subchild1 = child1.children.create("name" => "subchild1")
 
  root.parent   # => nil
  child1.parent # => root
  root.children # => [child1]
  root.children.first.children.first # => subchild1

/opt/local/lib/ruby/1.8/net/imap.rb:981:in `pick_up_tagged_response': Unknown namespace. (Net::IMAP::NoResponseError)

type: imap            
server: boxXXX.bluehost.com  
port: 993                
ssl: true               
username: username@domain.com 
password: xxx
use_login: true        
processed_folder: INBOX.processed
error_folder: INBOX.error

SELECT FROM A WHERE id NOT IN (SELECT id FROM B)