Rails - May 2011 - NoMethodError (undefined method `serializable_record' for #<ActiveModel

Hi ,
Am using rails 3 .I have added code in my controller
-----------------------------------------------------------------------
la.map{|c| ActiveRecord::Base::Serializer.new(c).serializable_record
-----------------------------------------------------------------------

But am getting below error

------------------------------------------------------------
NoMethodError (undefined method `serializable_record'' for
#<ActiveModel::Serializers::Xml::Serializer:0xa3e2a10>):
------------------------------------------------------------

Can anybody help me

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