foreign_key_options

# File activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb, line 1021
      def foreign_key_options(from_table, to_table, options) # :nodoc:
        options = options.dup
        options[:column] ||= foreign_key_column_for(to_table)
        options[:name]   ||= foreign_key_name(from_table, options)
        options
      end