Tag Archives: Rails

Resque test helpers, e.g. process all jobs

When testing resque jobs, the simples solution is to set Resque.inline = true, which just executes the jobs imediatly, but if you want to make sure that they e.g. have been scheduled for the right time or simulate non-parallel execution, you might find these useful.

ResqueScheduler
module ResqueScheduler
  def all_scheduled_jobs_count
    total_jobs = Hash.new(0)
    Array(redis.zrange(:delayed_queue_schedule, 0, -1)).each do |timestamp|
      total_jobs[timestamp.to_i] += redis.llen("delayed:#{timestamp}").to_i
    end
    total_jobs
  end
end

Resque
module Resque
  def self.perform_enqueue_and_scheduled(queue)
    while timestamp = Resque.next_delayed_timestamp
      Resque::Scheduler.enqueue_delayed_items_for_timestamp(timestamp)
    end
    Resque.perform_all(queue)
  end

  def self.perform_all(queue_name)
    until size(queue_name) == 0
      reserve(queue_name).perform
    end
  end
end

Moving config mess from environment files to config.yml

If your environments/*.rb look like a repetitive mess, its time to get a config.yml!

  • overview of your configuration
  • dry code
  • (optional) not check in all the passwords/keys of your app (only check in config.example.yml), great for open-source apps
  • Can be loaded without loading the environment (e.g. small rake tasks)
# lib/cfg.rb
CFG = YAML.load(ERB.new(
  File.read("config/config.yml")
).result)[Rails.env].with_indifferent_access

# config/application.rb
require "cfg"

# config/config.yml
common: &common
  api:
    airbrake_key: xxx
    google_analytics_key: yyy
  admin_email: admin@example.com

test:
  <<: *common
  host: 'localhost'

development:
  <<: *common
  host: 'localhost'

production:
  <<: *common
  host: 'fuu.bar'

# config/application.rb
config.action_mailer.default_url_options = {:host => CFG[:host]}

Do not show I18n missing translation tooltips in production

Problem:
Lots of stuff does not need any translation, so we simply leave it untranslated (e.g. firstname shows as Firstname). But this leaves ugly “missing translation” spans in out html.
Instead of entering senseless translations for everything thats missing, we simply deactivate the tooltips in production, while also avoiding raising/rescuing theses MissingTranslation errors to improve performance(rescue/raise is not cheap).

Code:

# https://grosser.it/2012/02/04/do-not-show-i18n-missing-translation-tooltips-in-production/
# config/initializers/disable_i18n_tooltips.rb
# missing translations
# - Do not show tooltips in production/test
# - Do not raise ( speedup) for every missing translations
I18n::Backend::Base.class_eval do
  def translate_with_default(locale, key, options = {})
    if options[:rescue_format] == :html && ['test','production'].include?(Rails.env)
      default = key.to_s.gsub('_', ' ').gsub(/\b('?[a-z])/) { $1.capitalize }
      options.reverse_merge!(default: default)
    end
    translate_without_default(locale, key, options)
  end

  alias_method_chain :translate, :default
end

parallel_split_test — Split slow tests into multiple chunks and run them in parallel

If you want to run 1 big/slow test file, use Parallel-Split-Test, it splits it into multiple chunks and then runs them in parallel.

PS: If you have lots of tests you should take a look at Parallel-Tests, which runs multiple files in parallel.

This became necessary because in our current project: spec runtime=3h (without integration) / slowest file=5 minutes. Now this time is only 1/3rd.