I have a model defined as follows:
class a< ActiveRecord::Base
has_many :bs, :through => :a_b_mappings, :uniq => true
has_many :cs, :through => :a_c_mappings, :uniq=> true
has_many :ds, :through => :a_d_mappings, :uniq => true
I'm trying to find a class method that will enumerate all the classes
(:bs,:cs,:ds,...) being associated from class a.
I'm at a loss as to what hooks ActiveRecord provides that would enable
me to do that.