A moderately hacky way of generating a PG connection string from AR::Base.configurations to use with QueueClassic

queue_classic.rb

ENV['DATABASE_URL'] ||= lambda {
  def config
    ActiveRecord::Base.configurations[Rails.env.to_s]
  end

  def credentials
    if (creds = [config['user'], config['password']]).any?
      creds.join(':')
    else
      nil
    end
  end

  def host
    if (h = config['host']).present?
      h
    else
      'localhost'
    end
  end

  [].tap { |a|
    a << 'postgres://'
    a << credentials + '@' if credentials
    a << host
    a << ':' + config['port'] if config['port']
    a << '/' + config['database']
  }.join
}.()

EmailQueue       = QC::Queue.new('qc_email_jobs')
ImageQueue       = QC::Queue.new('qc_image_jobs')
TranscodingQueue = QC::Queue.new('qc_transcoding_jobs')