ruby - has and belongs to more than 1 table

Question

I have an scaffold (critical_factor) with some fields like catalog_table_id and selectRight and also other scaffold (catalog_table) with the fields name table_name, model.

When I select in the critical_factor view in the field catalog_table_id the selectRight fill with all the fields of the table selected.

I have a has_and_belong_to catalog_tables_critical_factors with the fields catalog_table_id, critical_factor_id and table_relation_fields_id. In the last field I want save the id from the selectRight in the critical_factor view but I am only able to save the first two fields.

Any ideas?

Critical Factor Model

class CriticalFactor < ActiveRecord::Base
  has_and_belongs_to_many :catalog_tables
  attr_accessible: :critical_factor_id,:selectRight, :catalog_table_id
  def selectRight=(options)
    self.catalog_tables.clear
    options.each do |option|
      unless option.empty?
        line = CatalogTable.find(catalog_table_id)
        modelo = line.model
        case modelo
          when 'ActivityTypes'
            line = ActivityType.find(options,options.id)
          when 'Programs'
            line = Program.find(options)
        end

        self.catalog_tables << line
      end
    end
end

Catalog Table Model

class CatalogTable < ActiveRecord::Base
  has_and_belongs_to_many :critical_factors
  attr_accessible :name, :model, :table
end

catalog_table_critical_factor model

class CatalogTablesCriticalFactor < ActiveRecord::Base
  attr_accessible :critical_factor_id, :catalog_table_id, :table_select_field_id
end