How to sort collection of object?

Sort collection of object in rails?

• I know I can use something like User.sort {|a, b| a.attribute <=> b.attribute} or User.find and order, but is it a way like comparable interface in Java, so every time I called sort on User object it will do sort on the predefined attributes. Thanks,

• Answer:

  You can do that by defining the <=> method for your objects. That way, you should be able to just say: collection.sort for non-destructive sort, or collection.sort! for in-place sorting: So, example here: class A def <=>(other) # put sorting logic here end end And a more complete one: class A attr_accessor :val def initialize @val = 0 end def <=>(other) return @val <=> other.val end end a = A.new b = A.new a.val = 5 b.val = 1 ar = [a,b] ar.sort! ar.each do |x| puts x.val end This will output 1 and 5.