# File lib/scrubyt/core/scraping/filters/base_filter.rb, line 69
    def method_missing(method_name, *args, &block)
      case method_name.to_s
      when /^ensure.+/
        constraints << Constraint.send("add_#{method_name.to_s}".to_sym, self, *args)
      else
        throw_method_missing(method_name, *args, &block)
      end
    end