problem with composite keys with strings

[Eduardo Puente]

I have a table with two fields for the primary key, both are string the models are empleado and email; The creation of a new record works ok, but when I try to edit the record, I got the error "undefined method `numempleado_before_type_cast' for #<Email:0xbcc32a0>" 

Im using nested attributes in the form

require 'composite_primary_keys'

class Email < ActiveRecord::Base

    self.primary_keys = [:numempleado, :email]

    belongs_to :empleado, :class_name => 'Empleado', :foreign_key => :empleado_id    

end

class Empleado < ActiveRecord::Base

    self.primary_key = :numempleado

    has_many :cuentas, :class_name => 'Cuenta'    

    has_many :emails, :class_name => 'Email'    

    has_many :horarios, :class_name => 'Horario'    

    has_many :operadorsala, :class_name => 'Operadorsala'    

    has_many :productorasignado, :class_name => 'Productorasignado'    

    has_many :productorsolicitado, :class_name => 'Productorsolicitado' 

    belongs_to :tipoempleado, :class_name => 'Tipoempleado', :foreign_key => :tipoempleado_id     

    accepts_nested_attributes_for :horarios, allow_destroy: true, reject_if: lambda {|attributes| attributes['horainicio'].blank?}

    accepts_nested_attributes_for :cuentas, allow_destroy: true 

    accepts_nested_attributes_for :emails, allow_destroy: true, reject_if: lambda {|attributes| attributes['email'].blank?}

end

[cfis]

Hi Eduardo,

Please move this over to Github.  Also, whate version of ActiveRecord and CPK?

Charlie