Rails 3 path_without_format_and_extension

Just posting it here since I did not find anything on google when searching this for our rails 2 upgrade 🙂

view_context.instance_variable_get(:@_virtual_path)

Ruby/ActiveRecord fastest way to truncate test database

Tried a few strategies, but this seems to be the fastest:
DatabaseCleaner truncate_all: 0.8s
This: 0.2s

# fast truncation of all tables that need truncations (select is 10x faster then truncate)
# https://grosser.it/2012/07/03/rubyactiverecord-fastest-way-to-truncate-test-database/
def truncate_all_tables
  config = ActiveRecord::Base.configurations[::Rails.env]
  connection = ActiveRecord::Base.connection
  connection.disable_referential_integrity do
    connection.tables.each do |table_name|
      next if connection.select_value("SELECT count(*) FROM #{table_name}") == 0
      case config["adapter"]
      when "mysql", "mysql2", "postgresql"
        connection.execute("TRUNCATE #{table_name}")
      when "sqlite", "sqlite3"
        connection.execute("DELETE FROM #{table_name}")
        connection.execute("DELETE FROM sqlite_sequence where name='#{table_name}'")
      end
    end
    connection.execute("VACUUM") if config["adapter"] == "sqlite3"
  end
end

Loading rails 2.3 / 3+ in your gem tests

In case you want to test your gem / plugin on multiple rails version:

require 'rails/version'

if Rails::VERSION::MAJOR > 2
  require 'rails'
else
  module Rails
    class FakeConfig
      def after_initialize
      end
    end
    @@configuration = FakeConfig.new
  end
  require 'initializer'
end

ActiveRecord slow_delete_all

Deletes taking to long, just take a break 🙂
(so replication can catch up/things get unblocked)

Only use save sql, there is no escapeing.

  class ActiveRecord::Base
    def self.slow_delete_all(condition)
      count = 0
      loop do
        result = ActiveRecord::Base.connection.send(:delete_sql, "delete from #{table_name} where #{condition} limit 10000")
        count += result
        break if result == 0
        sleep 1
      end
      count
    end
  end

Resque scheduler on heroku without extra workers

require 'resque/tasks'
require 'resque_scheduler/tasks'
# Scheduler needs very little cpu, just start it with a worker.
desc "schedule and work, so we only need 1 dyno"
task :schedule_and_work do
  if Process.fork
    sh "rake environment resque:work"
  else
    sh "rake resque:scheduler"
    Process.wait
  end
end

Michael Grosser, the Blog

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