peter

class Foo
  def bar
  end
end

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namespace :db do
  # NOTE: In Rails 3 there will be a db:setup task but it only works if ActiveRecord::Base.schema_format == :ruby
  # See http://afreshcup.com/2009/05/11/seed-data-in-rails-3
  # The following patch fixes db:schema:load to work with schema_format :sql:
  # https://rails.lighthouseapp.com/projects/8994-ruby-on-rails/tickets/2789-make-rake-task-dbschemaload-compatible-with-sql-schema-format
  desc 'Recreate the database, load the schema, and initialize with the seed data'
  task :super_setup => [ 'db:drop', 'db:create' ] do
    system("cat db/development_structure.sql db/development_data.sql | script/dbconsole")
    seed_file = File.join(Rails.root, 'db', 'seeds.rb')
    load(seed_file) if File.exist?(seed_file)      

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# In lib/tasks/deploy.rake
namespace :deploy do
  def write_error_page(status, locale = nil)
    dest_filename = [status.to_s, locale, "html"].compact.join(".")
    File.open(File.join(Rails.root, "public", dest_filename), "w") do |file|
      path = File.join(Rails.root, "app", "views", "errors", "#{status}.rhtml")
      file.print ERB.new(File.read(path)).result
    end   
  end

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describe "Mocking/Stubbing Associations with RSpec" do
  it "can be done with proxy_target" do
    # Suppose the Article model has an after_save callback that invokes notify_change on the author
    # if the article has been changed.
    @article.author.proxy_target.should_receive(:notify_change)
    @article.update_attributes(:body => "new body")
  end
end

peter

class Author
  def invoke_inside(method, *args)
    self.send(method, *args)
  end
end

author = Article.first.author
def author.foobar
  "foobar"
end

peter

# This patch gives us an easy way to globally disable/enable the cache
Rails.cache.class.class_eval do
  attr_accessor :enabled
  def read_with_enabled(*args, &block)
    enabled ? read_without_enabled(*args, &block) : nil
  end
  alias_method_chain :read, :enabled
end

if File.basename($0) == "rake" && ARGV.include?("db:migrate")

peter

# => SELECT "posts".* FROM "posts" ORDER BY published DESC, id DESC LIMIT 1
Post.send(:with_scope, {:find => {:order => "id DESC"}}) do
  Post.first(:order => "published DESC")
end

peter

-- Order by one indexed column (FAST)
newsdesk_production=# explain analyze select * from pressreleases order by published_at DESC limit 100;
                                                                                   QUERY PLAN                                                                                    
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=0.00..249.91 rows=100 width=1207) (actual time=26.070..716.453 rows=100 loops=1)
   ->  Index Scan Backward using pressreleases_published_at_index on pressreleases  (cost=0.00..964766.62 rows=386042 width=1207) (actual time=26.067..716.343 rows=100 loops=1)
 Total runtime: 716.709 ms
(3 rows)

- Order by two separately indexed columns (SLOW)

peter

# Notes on migrating from the RSpec builtin mocking framework to the Mocha framework

# 1. Comment in this line in spec_helper.rb:
config.mock_with :mocha

# 2. Specify your gem dependency (optional) in config/environments/test.rb:
config.gem "mocha", :version => "0.9.8"

# 3. Use query-replace to do most but not all of the DSL conversion
# should_receive -> expects

peter

# In spec_helper.rb or test_helper.rb:
Mocha::Configuration.prevent(:stubbing_non_existent_method)

module MochaExtensions
  module ObjectMethods
    def expects_message(*args, &block)
      Mocha::Configuration.allow(:stubbing_non_existent_method) { expects(*args, &block) }
    end

    def stubs_message(*args, &block)