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## Change has_many_through_association.rb to fix http://dev.rubyonrails.org/ticket/11587 def construct_joins(custom_joins = nil) polymorphic_join = nil if @reflection.through_reflection.options[:as] || @reflection.source_reflection.macro == :belongs_to reflection_primary_key = @reflection.klass.primary_key source_primary_key = @reflection.source_reflection.primary_key_name else reflection_primary_key = @reflection.source_reflection.primary_key_name # I think that it is using the wrong key # There is to way to override this broken behavior because there is no support for foreign_key as an option # Add in the check for foreign key. This makes the behavior match the :include behavior for the same association source_primary_key = @reflection.options[:foreign_key] || @reflection.klass.primary_key if @reflection.source_reflection.options[:as] polymorphic_join = "AND %s.%s = %s" % [ @reflection.table_name, "#{@reflection.source_reflection.options[:as]}_type", @owner.class.quote(@reflection.through_reflection.klass.name) ] end end "INNER JOIN %s ON %s.%s = %s.%s %s #{@reflection.options[:joins]} #{custom_joins}" % [ @reflection.through_reflection.table_name, @reflection.table_name, reflection_primary_key, @reflection.through_reflection.table_name, source_primary_key, polymorphic_join ] end

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