Add a to_conditions method to ActiveRecord::Base

Add a to_conditions method to ActiveRecord::Base for converting models to finder :conditions hash. Mixes in a to_conditions method to ActiveRecord::Base.

Converts the attributes of an AR object to a ActiveRecord::Base#find :conditions hash. Useful for comparing AR objects, especially when looking for duplicates.
E.g.
 
if not Post.find(:all, :conditions => my_post.conditions).empty?
puts "Duplicate found"
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