skater coder » Rails

Commonly used Rails 2.3 commands

roadburn — Tue, 31 Aug 2010 05:43:58 +0000

Rails

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

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

Testing

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

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

1 2	Generate migration $ script/generate migration the_migration_name

Heroku

1 2	Push to Git $ git push heroku

Comma Separated List in Rails

roadburn — Sat, 24 Jul 2010 17:14:01 +0000

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’

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

To get ‘Tom, Dick and Harry’

1	@users.collect(&:name).to_sentence

How to: Create a Rails model that has categories and subcategories

roadburn — Fri, 23 Jul 2010 05:57:37 +0000

Another reason to love rails, it’s so easy!

Just install the acts_as_tree plugin

1	$ script/plugin install git://github.com/rails/acts_as_tree.git

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

1	acts_as_tree :order => 'name'

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

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

Railscasts – Tree Based Navigation

How to: Receive email in rails with mail fetcher

roadburn — Thu, 22 Jul 2010 16:46:26 +0000

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

Rails fetcher mail.yml IMAP setting for bluehost

roadburn — Tue, 20 Jul 2010 18:42:40 +0000

I was getting this error when trying to create a mailbox using create(mailbox) from Net::IMAP

1	/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.”

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

How to: Install Memcached on Ubuntu for Rails

roadburn — Wed, 18 Feb 2009 04:16:02 +0000

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

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

Attach images in rails

roadburn — Thu, 25 Dec 2008 08:01:16 +0000

View the railscast on using thoughtbot’s paperclip

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

attach multiple images to a model using polymorphic paperclip

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

Learning how to use Shoulda

roadburn — Mon, 15 Dec 2008 07:59:19 +0000

View the conf video to find out what Shoulda is

http://mwrc2008.confreaks.com/12saleh.html

Shoulda Walkthrough

http://technicalpickles.com/posts/a-walk-through-of-test-driven-development-with-shoulda

Read the thoughtbot tutorials

http://thoughtbot.com/projects/shoulda/tutorial

Rails export to excel spreadsheet

roadburn — Mon, 08 Dec 2008 18:13:28 +0000

1	$ sudo gem install spreadsheet

More help:

http://codeclimber.blogspot.com/2008/11/reporting-in-excel-with-rails.html

http://spreadsheet.rubyforge.org/

To send and save through browser

Taken from https://rubyforge.org/forum/forum.php?thread_id=29606&forum_id=2920

require 'stringio'
data = StringIO.new ''
book.write data
send_data data.string, :type=> "application/excel", :disposition=> 'attachment', :filename => 'MeaningfulName.xls'

Send email in rails

roadburn — Thu, 04 Dec 2008 10:30:25 +0000

http://railscasts.com/episodes/61