apply_common_behavior_for

# File actionpack/lib/action_dispatch/routing/mapper.rb, line 1590
          def apply_common_behavior_for(method, resources, options, &block) #:nodoc:
            if resources.length > 1
              resources.each { |r| send(method, r, options, &block) }
              return true
            end

            if options.delete(:shallow)
              shallow do
                send(method, resources.pop, options, &block)
              end
              return true
            end

            if resource_scope?
              nested { send(method, resources.pop, options, &block) }
              return true
            end

            options.keys.each do |k|
              (options[:constraints] ||= {})[k] = options.delete(k) if options[k].is_a?(Regexp)
            end

            scope_options = options.slice!(*RESOURCE_OPTIONS)
            unless scope_options.empty?
              scope(scope_options) do
                send(method, resources.pop, options, &block)
              end
              return true
            end

            unless action_options?(options)
              options.merge!(scope_action_options) if scope_action_options?
            end

            false
          end