westonplatter

# example take from 
# https://github.com/schneems/wicked/blob/40443aea2aba0fe506b9c878fb677f08f2114200/lib/wicked/wizard.rb

require 'active_support/concerns'

module FooBar::Concerns::Controllers::OneController
	extend ActiveSupport::Concerns

	# controller level methods associated with a Rails-route and View
	# IE, the controller structure

westonplatter

# MyApp/app/models/blorgh/post.rb
# overrides Blorgh's original Post model

class Blorgh::Post < ActiveRecord::Base
  include Blorgh::Concerns::Models::Post

  def time_since_created
    Time.current - created_at
 end

westonplatter

lasdjflksdajfklj

westonplatter

# want to see module/classes referenced via symbols.
# put this into IRB

module M  # Main is 3 keys longer than M
  class A
    def test
      "a"    
    end
  end

westonplatter

> mongo

// saving records
db.test.save({"a": 1})     //
db.test.find()             // { "_id" : ObjectId("502437b4a1d603739ab59206"), "a" : 1 }
db.test.save({"a": 100})   //

// retreaving range of records
db.test.find( { "a": { $gt: 0, $lt: 500 } } )    // { "_id" : ObjectId("502437b4a1d603739ab59206"), "a" : 1 }
                                                 // { "_id" : ObjectId("502675b7792a4a17c3b470b6"), "a" : 100 }

westonplatter

class Tweet
  attr_accessor :status
  attr_reader :created_at

  def initialize(status)
    @status = status
    @created_at = Time.now
  end
end

westonplatter

app1
|- app/views/photo_contests
|                      |- index.html.erb  # => custom view template #1
|
\- Gemfile (gem 'common_engine')

app2
|- app/views/photo_contests
|                      |- index.html.erb  # => custom view template #2
|

westonplatter

moved to https://github.com/westonplatter/talks/tree/master/rails_engines_orug

westonplatter

# This spec fails when I run it for (JRuby + sqlite), but not (Ruby 1.9.3 + [mysql | postgres])
#
# some_model.rb
describe SomeModel
  it { should have_db_index(:name).unique(true) }
end


# Even though the schema.rb shows the db field as unquiely indexed.
#

westonplatter

command line UI.

psql -h localhost  

other helpful commands

\du list users
CREATE DATABASE db_name;

CREATE ROLE postgres;