Rails: Order with nulls last

Question

In my Rails app I\'ve run into an issue a couple times that I\'d like to know how other people solve:

I have certain records where a value is optional, so some recor

Answer 1

Adding arrays together will preserve order:

@nonull = Photo.where("collection_id is not null").order("collection_id desc")
@yesnull = Photo.where("collection_id is null")
@wanted = @nonull+@yesnull

http://www.ruby-doc.org/core/classes/Array.html#M000271