Multiple sort conditions in arrays

In my work I found a case were I had to sort array using multiple conditions. For example:

• sort by date
• sort by time

In ruby it’s easy enough to create your own own sort rule :

@college.working_days.at_present.sorted.sort do |a,b|
  if b.date > a.date
     -1
  else
     a.started_at <=> b.started_at
  end
end

You can return 1 or -1 in order to specify it’s order.