Redmine

INFINITY = 1.0/0

#selection sort

def sort_issues(issues)

  for i in 0...issues.length do

    list = issues[i...issues.length]

    issue = list.min_by{|issue| issue.start_date ? issue.start_date.to_time.to_i : INFINITY }

    if issue.start_date != nil and issue != issues[i]

      destiny = issue.left_sibling

      issue.move_to_left_of issues[i]

      if destiny != issues[i]

        issues[i].move_to_right_of destiny

      end

      min_index = issues.index(issue)

      issues[i], issues[min_index] = issues[min_index], issues[i]

    end

    sort_issues issue.children

  end

end

def sort_all_issues

  Project.all.each do |project|

    project.issues.each do |issue|

      if issue.root?

        sort_issues(issue.children)

      end

    end

  end

  nil

end

sort_all_issues