Question

所以，我正在使用快递。我想使用next（）将控制器链接在一起。

我有三个。他们做不同的事情，我想把它们混合在一起。 checkEmailVerification如果不好则转到失败页面，如果好则转到next（）。另外两个就是下一个（）。 completeE（）会将它全部包装起来。

app.core.users.checkEmailVerification,
app.core.users.processVerification,
app.mean.subscribeMarketingEmails,
app.core.users.completeEmailVerification

我的第一个想法是将其表达为：

// Confirm users email
app.route('/auth/confirm/:confirmationCode').get(
    function(req, res, next) {
        app.core.stack(req, res, next, [
            app.core.users.checkEmailVerification,
            app.core.users.processVerification,
            app.mean.subscribeMarketingEmails
        ]);
    }
);

所以，我将下面的函数编写为我自己的编程挑战。

它不起作用。 C'est la vi。所以我的两个问题是：

最好的方法是什么？可能已经为此做了一些事情。 编辑：也许就是这样。 //确认用户电子邮件。app.route（ '/认证/确认/：confirmationCode'）得到（app.core.users.checkEmailVerification）; 。app.route（ '/认证/确认/：confirmationCode'）得到（app.core.users.processVerification）; 。app.route（ '/ AUTH /确认/：confirmationCode'）得到（app.mean.subscribeMarketingEmails）;
你能看到我在代码中遗漏了什么吗？递归不是更新'当前'。输出如下：

谢谢！

  // FIXME: this needs work
  /**
   *  Stack req controllers through the use of next()
   *
   *  E.g.  app.core.stack(req, res, [ 
              first, 
              second, 
              third
            ])
   *
   *  == more or less ==>
   *
   *  first(req, res, second(req, res, third(req, res)))
   */
  core.stack = function(req, res, next, controllers, current) {

    // current defaults to 0;
    current = current || 0;

    console.log('--> Current in stack:'+current);

    // Check if something went wrong.
    if (current < 0 || current >= controllers.length)
      throw "core.stack() parameter current is invalid";

    // If this is the last controller.  Complete.
    if (current == controllers.length-1) 
      return controllers[current](req, res, next);

    // We're in the middle somewhere.  Wrap in core.stack().
    current++;
    function wrap() {
      console.log('--> Current in wrapper:'+current);
      return core.stack(req, res, controllers, current)
    }
    return controllers[current](req, res, wrap);
  }

输出：

--> Current in stack:0
TypeError: Property '1' of object function (req, res, next) {
    if (true) {
      console.log("checking.  Success!");
      // process the next action in the route
      next();
    } else {
      // on failure, flash a message.  
      console.log('Huh.  That didn\'t work.  Login and click the resend verification email link');
    }
  },, is not a function
    at Object.core.stack (/home/michael/scm/mean-core/core.js:47:32)
    at Object.handle (/home/michael/scm/writermustwrite.com/app/routes/users.server.routes.js:24:13)
    at next_layer (/home/michael/scm/writermustwrite.com/node_modules/express/lib/router/route.js:103:13)
    at Route.dispatch (/home/michael/scm/writermustwrite.com/node_modules/express/lib/router/route.js:107:5)
    at c (/home/michael/scm/writermustwrite.com/node_modules/express/lib/router/index.js:195:24)
    at param (/home/michael/scm/writermustwrite.com/node_modules/express/lib/router/index.js:270:14)
    at param (/home/michael/scm/writermustwrite.com/node_modules/express/lib/router/index.js:282:16)
    at Function.proto.process_params (/home/michael/scm/writermustwrite.com/node_modules/express/lib/router/index.js:298:3)
    at next (/home/michael/scm/writermustwrite.com/node_modules/express/lib/router/index.js:189:19)
    at next (/home/michael/scm/writermustwrite.com/node_modules/express/lib/router/index.js:166:38)
GET /auth/confirm/adsfasdfasdf 500 61ms
--> Current in stack:0
TypeError: Property '1' of object function (req, res, next) {
    if (true) {
      console.log("checking.  Success!");
      // process the next action in the route
      next();
    } else {
      // on failure, flash a message.  
      console.log('Huh.  That didn\'t work.  Login and click the resend verification email link');
    }
  },, is not a function
    at Object.core.stack (/home/michael/scm/mean-core/core.js:47:32)
    at Object.handle (/home/michael/scm/writermustwrite.com/app/routes/users.server.routes.js:24:13)
    at next_layer (/home/michael/scm/writermustwrite.com/node_modules/express/lib/router/route.js:103:13)
    at Route.dispatch (/home/michael/scm/writermustwrite.com/node_modules/express/lib/router/route.js:107:5)
    at c (/home/michael/scm/writermustwrite.com/node_modules/express/lib/router/index.js:195:24)
    at param (/home/michael/scm/writermustwrite.com/node_modules/express/lib/router/index.js:270:14)
    at param (/home/michael/scm/writermustwrite.com/node_modules/express/lib/router/index.js:282:16)
    at Function.proto.process_params (/home/michael/scm/writermustwrite.com/node_modules/express/lib/router/index.js:298:3)
    at next (/home/michael/scm/writermustwrite.com/node_modules/express/lib/router/index.js:189:19)
    at next (/home/michael/scm/writermustwrite.com/node_modules/express/lib/router/index.js:166:38)
--> Current in stack:0
TypeError: Property '1' of object function (req, res, next) {
    if (true) {
      console.log("checking.  Success!");
      // process the next action in the route
      next();
    } else {
      // on failure, flash a message.  
      console.log('Huh.  That didn\'t work.  Login and click the resend verification email link');
    }
  },, is not a function
    at Object.core.stack (/home/michael/scm/mean-core/core.js:47:32)
    at Object.handle (/home/michael/scm/writermustwrite.com/app/routes/users.server.routes.js:24:13)
    at next_layer (/home/michael/scm/writermustwrite.com/node_modules/express/lib/router/route.js:103:13)
    at Route.dispatch (/home/michael/scm/writermustwrite.com/node_modules/express/lib/router/route.js:107:5)
    at c (/home/michael/scm/writermustwrite.com/node_modules/express/lib/router/index.js:195:24)
    at param (/home/michael/scm/writermustwrite.com/node_modules/express/lib/router/index.js:270:14)
    at param (/home/michael/scm/writermustwrite.com/node_modules/express/lib/router/index.js:282:16)
    at Function.proto.process_params (/home/michael/scm/writermustwrite.com/node_modules/express/lib/router/index.js:298:3)
    at next (/home/michael/scm/writermustwrite.com/node_modules/express/lib/router/index.js:189:19)
    at next (/home/michael/scm/writermustwrite.com/node_modules/express/lib/router/index.js:166:38)

Answer 1

对于错误，您可以调试（https://github.com/node-inspector/node-inspector）并查看控制器功能内部发生的情况。

对于逻辑，我认为你缺少第一个控制器调用，因为当前++在控制器[current]之前，所以你永远不会调用第一个控制器。

对于解决方案，您可以为同一路径添加多个路由处理程序。 next变量指向同一路由的下一个处理程序。所以，你会用简化的代码实现同样的目标。

app.route('/auth/confirm/:confirmationCode')
         .get(app.core.users.checkEmailVerification)
         .get(app.core.users.processVerification)
         .get(app.mean.subscribeMarketingEmails);

甚至是

app.route('/auth/confirm/:confirmationCode').get(
                  app.core.users.checkEmailVerification,
                  app.core.users.processVerification,
                  app.mean.subscribeMarketingEmails);

控制器功能将通过req，res和next对象。

如何在Express 4.x中将路由控制器链接在一起？

1 个答案: