javascript - 如何从 sails.js 上的不同操作中获取返回的对象？

Question

我对 sails.js 还很陌生，目前正在尝试从不同的操作中获取返回的对象。

目前我知道的是，如果我在“UserController”内使用“getUserTransaction”操作，那么我只能使用局部变量(_.each)将其返回到“getUserTransaction.ejs” View 。 (CMIIW)示例:

//UserController
getUserTransaction: function (req, res, next){
   UserTransaction.find({user:req.param('userid')}).exec(function foundTransactions(err, transactions){
      if(err) return next(err);

      if(!transactions) return next();

      res.view({
         transactions: transactions
      });
   });
}

//getUserTransaction.ejs 
...
<% _.each(transactions, function(transaction){ %>
   <tr>
       <td><%= transaction.data %></td>
       <td><a href="<%= transaction.path %>">Link</a></td>
   </tr>
<% }); %>
...

但是，如果我想将对象从“UserController”内的“getUserHobby”操作返回到“getUserTransaction.ejs” View 怎么办？这是我的代码，我无法正确执行

//UserController
getUserHobby: function (req, res, next){
   UserHobby.find({user:req.param('userid')}).exec(function foundHobbies(err, hobbies){
      if(err) return next(err);

      if(!hobbies) return next();

      res.view('user/getUserTransaction', {
         hobbies: hobbies
      });
   });
}

//getUserTransaction.ejs
...
<% _.each(hobbies, function(hobby){ %>
   <tr>
       <td><%= hobby.type %></td>
       <td><%= hobby.name %></td>
   </tr>
<% }); %>
...

我尝试这样做并返回“爱好未定义”。那么我应该如何做正确的事情。

问候

Answer 1

首先，在 Sails controller 中操作，您不应使用第三个参数(next)。

Unlike Express middleware methods, Sails controller actions should always be the last stop in the request chain--that is, they should always result in either a response or an error. While it is possible to use next in an action method, you are strongly encouraged to use policies instead wherever possible.

您应该使用内置的 response方法即使您想抛出错误。

这是我编写 Controller 操作的方式:

// Inside api/controllers/UserController.js
getUserTransactions: function (req, res) {
  if(!req.param('userid'))
    return res.badRequest(); // Send a 400 response back down to the client indicating that the request is invalid

  UserTransaction
    .find({ user: req.param('userid') })
    .exec(function foundTransactions(err, transactions){
      if(err)
        return res.negotiate(err); // Send an appropriate error response back down to the client

      // If there is no transactions, you can display a message in your view
      return res.ok({ transactions: transactions }); // Send a 200 ("OK") response back down to the client with the provided data
  });
}

以下是编写相应 View 的方法:

// Inside views/user/getUserTransaction.ejs
<% if(data.transactions.length) { %>
    <!-- display each transactions... -->
    ...
<% } else { %>
    <p>This user has no transaction yet.</p>
<% } %>

<小时/>

对于您的其他操作，您可以使用 res.ok带有 pathToView 参数

res.ok({ hobbies: hobbies }, 'user/getUserTransactions');

您的 View 必须位于 views/user/getUserTransactions.ejs 文件中才能正确运行。

<小时/>

现在我们已经审核了您的代码，可以回答您的问题了。

所以你想在另一个 Controller 中调用 Controller 的操作。这是possible但不推荐。

这是你应该做的:

// api/controllers/UserController.js
// In your getUserTransactions method (you should change its name)
// Get the user transactions
UserTransaction
  .find({ user: req.param('userid') })
  .exec(function foundTransactions(err, transactions) {
    if(err) return res.negotiate(err);

    // Get the user hobbies
    UserHobby
      .find({ user: req.param('userid') })
      .exec(function foundHobbies(err, hobbies) {
        if(err) return res.negotiate(err);

        return res.ok({
          transactions: transactions,
          hobbies: hobbies
        });
   });
});

您还可以使用services简化您的 Controller 。

// api/services/UserService.js
module.exports.getUserTransactions = function (userId, cb) {
  UserTransaction
    .find({ user: userId })
    .exec(cb);
};

module.exports.getUserHobbies = function (userId, cb) {
  UserHobby
    .find({ user: userId })
    .exec(cb);
};

// Inside api/controllers/UserController.js
UserService
  .getUserTransactions(req.param('userid'), function (err, transactions) {
    if(err) return res.negotiate(err);

    UserService
      .getUserHobbies(req.param('userid'), function (err, hobbies) {
        if(err) return res.negotiate(err);

        return res.ok({
          transactions: transactions,
          hobbies: hobbies
        });
    });
});