gistfile1.txt

  def self.on_time
    select {|s| s.generally_available_on.blank? ? (Date.today <= s.qa_original_completed_on) : (s.generally_available_on <=  s.qa_original_completed_on)}
  end

returns error:

 sw = SoftwareRelease.by_month(date).on_time
ArgumentError: wrong number of arguments (0 for 1)

but used in the console, it works:

sw = SoftwareRelease.by_month(date).select {|s| s.generally_available_on.blank? ? (Date.today <= s.qa_original_completed_on) : (s.generally_available_on <= s.qa_original_completed_on)}
=> [#<SoftwareRelease id: ...>]