openproject/app/models/work_package/status_transitions.rb

module WorkPackage::StatusTransitions

  include do

  end

# Return true if the issue is being reopened
  def reopened?
    if !new_record? && status_id_changed?
      status_was = IssueStatus.find_by_id(status_id_was)
      status_new = IssueStatus.find_by_id(status_id)
      if status_was && status_new && status_was.is_closed? && !status_new.is_closed?
        return true
      end
    end
    false
  end

  # Return true if the issue is being closed
  def closing?
    if !new_record? && status_id_changed?
      status_was = IssueStatus.find_by_id(status_id_was)
      status_new = IssueStatus.find_by_id(status_id)
      if status_was && status_new && !status_was.is_closed? && status_new.is_closed?
        return true
      end
    end
    false
  end
end
Adding the more complex validations (re-/scheduling, versions etc.) Also pulled up lots of methods from issue, that are now grouped in various concerns under models/work_package: This is just a test to see how much travis/ci likes this, for now it is only an organizational means to work on the transition without interrupting the work-package-core too much. 11 years ago			`module WorkPackage::StatusTransitions`

			`include do`

			`end`

			`# Return true if the issue is being reopened`
			`def reopened?`
			`if !new_record? && status_id_changed?`
			`status_was = IssueStatus.find_by_id(status_id_was)`
			`status_new = IssueStatus.find_by_id(status_id)`
			`if status_was && status_new && status_was.is_closed? && !status_new.is_closed?`
			`return true`
			`end`
			`end`
			`false`
			`end`

			`# Return true if the issue is being closed`
			`def closing?`
			`if !new_record? && status_id_changed?`
			`status_was = IssueStatus.find_by_id(status_id_was)`
			`status_new = IssueStatus.find_by_id(status_id)`
			`if status_was && status_new && !status_was.is_closed? && status_new.is_closed?`
			`return true`
			`end`
			`end`
			`false`
			`end`
			`end`