belongs_to_options

# File activerecord/lib/active_record/associations/builder/has_and_belongs_to_many.rb, line 113
    def belongs_to_options(options)
      rhs_options = {}

      if options.key? :class_name
        rhs_options[:foreign_key] = options[:class_name].to_s.foreign_key
        rhs_options[:class_name] = options[:class_name]
      end

      if options.key? :association_foreign_key
        rhs_options[:foreign_key] = options[:association_foreign_key]
      end

      rhs_options
    end