allow_only_integer?

# File activemodel/lib/active_model/validations/numericality.rb, line 112
      def allow_only_integer?(record)
        case options[:only_integer]
        when Symbol
          record.send(options[:only_integer])
        when Proc
          options[:only_integer].call(record)
        else
          options[:only_integer]
        end
      end