Hi,
I have an array of objects in ruby on rails. I want to sort this array by an attribute of the object. Is it possible?
+10
A:
Yes, using Array#sort! this is easy.
myarray.sort! { |a, b| a.attribute <=> b.attribute }
Konrad Rudolph
2009-05-19 10:56:49
Thnx buddybut it didn't work out for mei have an array of objects. In which one of the attribute of the object is created_at.I want to sort it with this field. so i did @comm_bytes.sort! {|a, b| a.created_at <=> b.created_at }but no luck for mecan u help....??
2009-05-19 11:25:51
Is there a created_at method to access the @created_at attribute? What kind of object is @created_at? Does it define `<=>`? What kind of errors are you getting? etc, etc, ad nauseum. In other words, we need more detail than "but no luck for me".
rampion
2009-05-20 13:19:16
+5
A:
Array#sort works well, as posted above:
myarray.sort! { |a, b| a.attribute <=> b.attribute }
BUT, you need to make sure that the <=> operator is implemented for that attribute. If it's a Ruby native data type, this isn't a problem. Otherwise, write you own implementation that returns -1 if a < b, 0 if they are equal, and 1 if a > b.
Curt Sampson
2009-05-19 11:35:31
+5
A:
I recommend using sort_by instead:
objects.sort_by {|obj| obj.attribute}
Especially if attribute may be calculated.
Scott
2009-05-20 13:55:45