skater coder » Rails http://www.skatercoder.com angela chng - Ruby on Rails / PHP web developer & skater girl in Singapore Wed, 18 May 2011 06:35:18 +0000 en hourly 1 http://wordpress.org/?v=3.1.2 Debugging script/runner http://www.skatercoder.com/2011/03/21/debugging-scriptrunner/ http://www.skatercoder.com/2011/03/21/debugging-scriptrunner/#comments Mon, 21 Mar 2011 12:12:58 +0000 roadburn http://www.skatercoder.com/?p=494 If you need to debug script/runner

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$ sudo gem install ruby-debug
$ rdebug script/runner script.rb

References
http://cheat.errtheblog.com/s/rdebug/

]]> http://www.skatercoder.com/2011/03/21/debugging-scriptrunner/feed/ 0 Testing Spree with cucumber + spork + autotest + pickle + factory girl http://www.skatercoder.com/2010/09/04/testing-spree-with-cucumber-spork-autotest-pickle/ http://www.skatercoder.com/2010/09/04/testing-spree-with-cucumber-spork-autotest-pickle/#comments Sat, 04 Sep 2010 13:10:22 +0000 roadburn http://www.skatercoder.com/?p=439 Copy this from the spree root folder into your app

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spree-0.11.0/features
to 
yourapp/features

Edit features/support/env.rb

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ENV["RAILS_ENV"] ||= "cucumber"
 
require 'rubygems'
require 'spork'
 
Spork.prefork do
  require File.expand_path(File.dirname(__FILE__) + '/../../config/environment')
 
  require 'cucumber/formatter/unicode' # Remove this line if you don't want Cucumber Unicode support
  require 'cucumber/rails/world'
  require 'cucumber/rails/active_record'
  require 'cucumber/web/tableish'
 
 
  require 'capybara/rails'
  require 'capybara/cucumber'
  require 'capybara/session'
  require 'cucumber/rails/capybara_javascript_emulation' # Lets you click links with onclick javascript handlers without using @culerity or @javascript
  # Capybara defaults to XPath selectors rather than Webrat's default of CSS3. In
  # order to ease the transition to Capybara we set the default here. If you'd
  # prefer to use XPath just remove this line and adjust any selectors in your
  # steps to use the XPath syntax.
  Capybara.default_selector = :css
 
 
  Dir.glob(SPREE_ROOT + '/db/default/*.{yml,csv,rb}').each do |file|
    Fixtures.create_fixtures(SPREE_ROOT + '/db/default', File.basename(file, '.*'))
  end
  Dir.glob(SPREE_ROOT + '/test/fixtures/*.{yml,csv,rb}').each do |file|
    Fixtures.create_fixtures(SPREE_ROOT + '/test/fixtures', File.basename(file, '.*'))
  end
 
  require 'faker'
  require 'factory_girl'
 
  [ File.join(SPREE_ROOT, 'test', 'factories', '*.rb'),
    File.join(RAILS_ROOT, 'vendor', 'extensions', '*',
      '{test,spec}', 'factories', '*.rb')
  ].each do |path|
    Dir.glob(path).each { |factory| require factory }
  end
 
  require 'factory_girl/step_definitions'
 
  Zone.class_eval do
    def self.global
      find_by_name("GlobalZone") || Factory(:global_zone)
    end
  end
 
  Product.class_eval do
    def taxon=(taxon_name)
      taxonomy = Taxonomy.find_or_create_by_name("Category")
      taxon = Taxon.find_or_create_by_name_and_taxonomy_id(taxon_name, taxonomy)
      self.taxons << taxon
    end
  end
 
  ShippingMethod.create(:name => "UPS Ground", :zone => Zone.global, :calculator => Calculator::FlatRate.new)
 
  coupon = Coupon.create(:code => "SPREE", :description => "$5 off any order", :combine => false, :calculator => Calculator::FlatRate.new)
  coupon.calculator.update_attribute(:preferred_amount, 5)
 
end
 
Spork.each_run do
  # If you set this to false, any error raised from within your app will bubble
  # up to your step definition and out to cucumber unless you catch it somewhere
  # on the way. You can make Rails rescue errors and render error pages on a
  # per-scenario basis by tagging a scenario or feature with the @allow-rescue tag.
  #
  # If you set this to true, Rails will rescue all errors and render error
  # pages, more or less in the same way your application would behave in the
  # default production environment. It's not recommended to do this for all
  # of your scenarios, as this makes it hard to discover errors in your application.
  ActionController::Base.allow_rescue = false
 
  # If you set this to true, each scenario will run in a database transaction.
  # You can still turn off transactions on a per-scenario basis, simply tagging
  # a feature or scenario with the @no-txn tag. If you are using Capybara,
  # tagging with @culerity or @javascript will also turn transactions off.
  #
  # If you set this to false, transactions will be off for all scenarios,
  # regardless of whether you use @no-txn or not.
  #
  # Beware that turning transactions off will leave data in your database
  # after each scenario, which can lead to hard-to-debug failures in
  # subsequent scenarios. If you do this, we recommend you create a Before
  # block that will explicitly put your database in a known state.
  Cucumber::Rails::World.use_transactional_fixtures = true
 
  # How to clean your database when transactions are turned off. See
  # http://github.com/bmabey/database_cleaner for more info.
  require 'database_cleaner'
  DatabaseCleaner.strategy = :truncation
end

config/cucumber.yml

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<%
rerun = File.file?('rerun.txt') ? IO.read('rerun.txt') : ""
rerun_opts = rerun.to_s.strip.empty? ? "--format progress features" : "--format #{ENV['CUCUMBER_FORMAT'] || 'pretty'} #{rerun}"
std_opts = "#{rerun_opts} --format rerun --out rerun.txt --strict --tags ~@wip"
%>
default: --drb <%= std_opts %>
wip: --drb --tags @wip:3 --wip features
autotest: --drb features --guess --format 'pretty' --color
autotest-all: --drb features --guess --format 'progress' --color

config/environments/cucumber.rb

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ENV['AUTOFEATURE'] = "true"
ENV['RSPEC'] = "true"

config/database.yml

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cucumber:
  <<: *test

Run your tests!

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$ spork cuc
$ autotest

Resources

http://groups.google.com/group/spree-user/browse_thread/thread/81b006af48d3166d

]]> http://www.skatercoder.com/2010/09/04/testing-spree-with-cucumber-spork-autotest-pickle/feed/ 1 Commonly used Rails 2.3 commands http://www.skatercoder.com/2010/08/31/commonly-used-rails-2-3-command-line/ http://www.skatercoder.com/2010/08/31/commonly-used-rails-2-3-command-line/#comments Tue, 31 Aug 2010 05:43:58 +0000 roadburn http://www.skatercoder.com/?p=419 Rails 
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Setup rails app with mysql
$ rails appname -d mysql
 
Start server with debugging enabled
$ script/server --debugger
 
Start server with debugging enabled - specify environment
$ script/server --debugger RAILS_ENV=production
 
Install required gems
$ sudo rake gems:install
 
Run gem server for rdocs
$ gem server
 
View routes 
$ rake routes
 
Update Rails
$ rake rails:update
 
Enter the console with specified environment
$ script/console
$ script/console development
$ script/console test
$ script/console production
 
Clear logfiles
$ rake log:clear

Database

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Create database
$ rake db:create
 
Run database migrations
$ rake db:migrate
 
Drop database
$ rake db:drop
 
Rollback database migration
$ rake db:rollback

Testing

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

Gems

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

Generators

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Generate migration
$ script/generate migration the_migration_name

Heroku

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Push to Git
$ git push heroku
]]> http://www.skatercoder.com/2010/08/31/commonly-used-rails-2-3-command-line/feed/ 0 How to upload multiple files on rails (uploadify + paperclip + jquery) http://www.skatercoder.com/2010/08/31/how-to-upload-multiple-files-on-rails-uploadify-paperclip-jquery/ http://www.skatercoder.com/2010/08/31/how-to-upload-multiple-files-on-rails-uploadify-paperclip-jquery/#comments Tue, 31 Aug 2010 04:27:50 +0000 roadburn http://www.skatercoder.com/?p=397 Setting Up

Download Uploadify from
http://www.uploadify.com/

copy the uploadify files into the following directories

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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

Create this file
app/middleware/flash_session_cookie_middleware.rb

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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

Add this line to
config/initializers/session_store.rb

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

Make sure your environment.rb file has this

config/environment.rb

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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

Models

Let’s assume you want to create a photo album with many photos.

Create your photo model with the following:

db/migrate/create_photos.rb

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class CreatePhotos < ActiveRecord::Migration
  def self.up
    create_table :photos 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

In your album model:

app/model/album.rb

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

In your photo model:
app/model/photo.rb

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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']

Controllers

app/controllers/photos_controller.rb

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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

Views

app/views/albums/show.html.erb

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<%= 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 %>

Resources

Many thanks to the following articles that helped me figure out how to get this working
Please follow the links for more detailed explanations

http://fencore.posterous.com/uploadify-with-paperclip-on-rails-tutorial
http://timmyc.posterous.com/uploadify-on-rails-with-paperclip
http://www.practicalecommerce.com/blogs/post/432-Multiple-Attachments-in-Rails
http://www.utoronto.ca/web/htmldocs/book/book-3ed/appb/mimetype.html
http://en.wikipedia.org/wiki/Internet_media_type

]]> http://www.skatercoder.com/2010/08/31/how-to-upload-multiple-files-on-rails-uploadify-paperclip-jquery/feed/ 2 Comma Separated List in Rails http://www.skatercoder.com/2010/07/25/comma-separated-list-in-rails/ http://www.skatercoder.com/2010/07/25/comma-separated-list-in-rails/#comments Sat, 24 Jul 2010 17:14:01 +0000 roadburn http://www.skatercoder.com/?p=391 Here’s a useful tip I found from http://ariejan.net/2007/03/27/rails-tip-snippet-create-a-comma-seperate-list/

To get ‘Tom, Dick, Harry’

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

To get ‘Tom, Dick and Harry’

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@users.collect(&:name).to_sentence
]]> http://www.skatercoder.com/2010/07/25/comma-separated-list-in-rails/feed/ 0 How to: Create a Rails model that has categories and subcategories http://www.skatercoder.com/2010/07/23/how-to-create-a-rails-model-that-has-categories-and-subcategories/ http://www.skatercoder.com/2010/07/23/how-to-create-a-rails-model-that-has-categories-and-subcategories/#comments Fri, 23 Jul 2010 05:57:37 +0000 roadburn http://www.skatercoder.com/?p=384 Another reason to love rails, it’s so easy!

Just install the acts_as_tree plugin

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

and in your model, eg. app/models/category.rb, just add

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acts_as_tree :order => 'name'

And here’s the plugin’s readme on how to use it

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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

Resources

]]> http://www.skatercoder.com/2010/07/23/how-to-create-a-rails-model-that-has-categories-and-subcategories/feed/ 0 How to: Receive email in rails with mail fetcher http://www.skatercoder.com/2010/07/23/how-to-receive-email-in-rails-with-mail-fetcher/ http://www.skatercoder.com/2010/07/23/how-to-receive-email-in-rails-with-mail-fetcher/#comments Thu, 22 Jul 2010 16:46:26 +0000 roadburn http://roadburn.audioreload.com/?p=362 Dan Weinand and Luke Francl have written a nice plugin which simplifies the task of retrieving emails. Kudos to them!

So basically what you need to do is install the plugin, create the Action Mailer receiver, and then use cron to schedule the script to run

Here are the steps:

First install the fetcher plugin from http://github.com/look/fetcher/ and SystemTimer gem it requires

$ script/plugin install git://github.com/look/fetcher.git
$ sudo gem install SystemTimer

Create your ruby script eg. script/mail_fetcher

#!/usr/bin/env ruby
require File.dirname(__FILE__) + '/../config/environment.rb'
 
require 'system_timer'
require 'yaml'
require 'fetcher'
 
 
begin
  puts "Start checking email"
 
  Lockfile.new('cron_mail_fetcher.lock', :retries => 0) do
    config = YAML.load_file("#{RAILS_ROOT}/config/mail.yml")
    config = config[RAILS_ENV].to_options
 
    fetcher = Fetcher.create({:receiver => EnquiryMailer}.merge(config))
    fetcher.fetch
  end
rescue Lockfile::MaxTriesLockError => e
  puts "Another fetcher is already running. Exiting."
end

Create the config/mail.yml file

defaults: &defaults
  # Settings for gmail
  type: imap                # pop OR imap
  server: imap.gmail.com  # server hostname
  port: 993                 # 993 for IMAPs
  ssl: true                 # Remove if not using SSL
  username: user@gmail.com    # Username
  password: xxx                # Password
  use_login: true           # Required for GMAIL
  processed_folder: processed
  error_folder: error
 
 # settings for bluehost
  type: imap                # pop OR imap
  server: boxXXX.bluehost.com  # server hostname
  port: 993                 # 993 for IMAPs
  ssl: true                 # Remove if not using SSL
  username: user@domain.com    # Username
  password: xxx                # Password
  use_login: true
  processed_folder: INBOX.processed
  error_folder: INBOX.error
 
development:
  <<: *defaults
  # Override other values here
 
test:
  <<: *defaults
  # Override other values here
 
production:
  <<: *defaults
  # Override other values here

Create your Action Mailer

$ script/generate mailer EnquiryMailer

Add the receiver in app/models/enquiry_mailer.rb

class EnquiryMailer < ActionMailer::Base
  def receive(email)
    # do whatever you want with the email here
    # you can use:
    # email.subject, email.from, email.body
  end
end

Run the script

$ script/runner script/mail_fetcher

Then follow Ryan Bate’s screencast on how to use Cron in Ruby

Resources

]]> http://www.skatercoder.com/2010/07/23/how-to-receive-email-in-rails-with-mail-fetcher/feed/ 1 Rails fetcher mail.yml IMAP setting for bluehost http://www.skatercoder.com/2010/07/21/rails-fetcher-mail-yml-imap-setting-for-bluehost/ http://www.skatercoder.com/2010/07/21/rails-fetcher-mail-yml-imap-setting-for-bluehost/#comments Tue, 20 Jul 2010 18:42:40 +0000 roadburn http://roadburn.audioreload.com/?p=302 I was getting this error when trying to create a mailbox using create(mailbox) from Net::IMAP

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

Realised that the processed and error mailboxes names had to be appended to “INBOX.”

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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
]]> http://www.skatercoder.com/2010/07/21/rails-fetcher-mail-yml-imap-setting-for-bluehost/feed/ 0 How to: Install Memcached on Ubuntu for Rails http://www.skatercoder.com/2009/02/18/installing-memcached-on-ubuntu-for-rails/ http://www.skatercoder.com/2009/02/18/installing-memcached-on-ubuntu-for-rails/#comments Wed, 18 Feb 2009 04:16:02 +0000 roadburn http://roadburn.audioreload.com/?p=260 
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sudo aptitude install memcached
 
sudo aptitude install libmemcache-dev
 
sudo gem install RubyInline
 
sudo gem install memcache-client

in application.rb

Uncomment the protect_from_forgery

in environment.rb

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CACHE = MemCache.new 'localhost:11211', :namespace =&gt; 'your_app'
 
config.action_controller.session = {
:session_key => '_your_app_session',
:secret      => 'yoursecrectkey',
:cache       => CACHE,
:expires=> 900  }
 
config.action_controller.session_store = :mem_cache_store
]]> http://www.skatercoder.com/2009/02/18/installing-memcached-on-ubuntu-for-rails/feed/ 0 Attach images in rails http://www.skatercoder.com/2008/12/25/attach-images-in-rails/ http://www.skatercoder.com/2008/12/25/attach-images-in-rails/#comments Thu, 25 Dec 2008 08:01:16 +0000 roadburn http://roadburn.audioreload.com/?p=253 View the railscast on using thoughtbot’s paperclip

http://railscasts.com/episodes/134-paperclip

or

attach multiple images to a model using polymorphic paperclip

http://burm.net/2008/10/17/ruby-on-rails-polymorphic-paperclip-plugin-tutorial/

]]> http://www.skatercoder.com/2008/12/25/attach-images-in-rails/feed/ 0