rubyonrailsin

I have built a simple forum but am having difficult getting the topics
to display in the order of their latest reply.

The associations are as follows:

class Forum < ActiveRecord::Base
has_many :topics, :order => "sticky DESC, created_at DESC"
has_many :replies, :through => :topics

class Topic < ActiveRecord::Base
belongs_to :forum
has_many :replies, :order => "created_at", :dependent => :destroy

class Reply < ActiveRecord::Base
belongs_to :topic

And in my controller I am calling @topics = @forum.topics

What I would like to do is sort the topics by the created_at of their
most recent posts.

Any advice appreciated.

Thanks,

Dan

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