Rails - Mar 2007 - Advanced Plugin Development Question

I have the following code for a plugin that I am developing:

module ClassMethods
        def my_method(child_table)

          child = child_table.to_s;
          c = child.pluralize

          has_and_belongs_to_many c.to_sym,
                                  :class_name => self.name,
                                  :join_table => c.to_s +
''_'' +
self.name.pluralize,
                                  :association_foreign_key => child +
"_id",
                                  :foreign_key => self.name +
"_id",
                                  :after_add
=> :create_bidirectional_link,
                                  :after_remove
=> :remove_bidirectional_link

          class_eval do

            define_method("create_bidirectional_link(child)") do
              child.c << self unless child.c.include?(self)
            end

            define_method("remove_bidirectional_link(child)") do
              child.c.delete(self) rescue nil
            end
          end

        end

When I run the code I get the following error message when I use
my_method in the Person model class:

NoMethodError: undefined method `create_bidirectional_link'' for
#<Person:0x31dd71c>

How do I inject the create and remove methods to the ActiveRecord
class? TIA.


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