sorting a ruby array of objects by an attribute that could be nil

Question

I have an array of objects that I need to sort by a position attribute that could be an integer or nil, and I need the objects that have the nil position to be at the end of

Answer 1

To be fair, I'm not very familiar with Ruby, so take this as more of an algorithm idea rather than a code one... and rewrite the ?: operator as whatever Ruby has that's cleaner.

Can't you just check for nil in the comparison:

class Parent
  def sorted_children
     children.sort{|a,b|( a and b ) ? a <=> b : ( a ? -1 : 1 ) }
  end
end

Edited to use Glenra's code, which implements the same thing as mine but in a smaller (and probably easier to read) amount of code.