在NETCONF中使用远程过程调用(use of remote procedure call in NETCONF)

 教师发现功能将被异步调用，所以JavaScript代码将继续之前，你有该猫鼬查询的结果。 
 
 您需要在回调中添加课程的保存。 可能看起来像这样： 
 
 
 
 
 
  
if (!req.body) return console.log("No data sent");

dbs.collection('instructors').find({
  name: req.body.iname
}).toArray((err, instructors) => {
  if (!err) {
    if (!instructors) {
      var newcourse = new clist({
        // new data also from instructors
      });

      newcourse.save(function(err) {
        if (err) {
          res.status(400);
          res.send(err);
        }
        else {
          res.status(200);
          res.redirect('/course');
        }
      });
    }
    else {
      res.status(400);
      res.send("Could not find instructor");
    }
  }
  else {
    res.status(400);
    res.send(err);
  }
});
 
 
 
 
 
 但请注意，通过这种方式，您可以获得具有给定名称的所有教师，并且您必须从该阵列中选择一个。 如果您想要将更多课程保存到教师中，则必须更改模式：例如 
 
 
 
 
 
  
var courseSchema = mongoose.Schema({
  // Schema variables
  ...

});

var courseModel = mongoose.model("Course", courseSchema);

var instructorlist = mongoose.Schema({
  name: {
    type: String,
    required: true
  },

  ...

  courses: [{
    type: ObjectId,
    ref: "Course"
  }]
});
 
 
 
 

The instructors find function will be called asynchronously so the javascript code will go on before you have the results of that mongoose query.
 
You need to add the saving of the course inside the callback. Could look like this:
 
 
 
 
 
  
if (!req.body) return console.log("No data sent");

dbs.collection('instructors').find({
  name: req.body.iname
}).toArray((err, instructors) => {
  if (!err) {
    if (!instructors) {
      var newcourse = new clist({
        // new data also from instructors
      });

      newcourse.save(function(err) {
        if (err) {
          res.status(400);
          res.send(err);
        }
        else {
          res.status(200);
          res.redirect('/course');
        }
      });
    }
    else {
      res.status(400);
      res.send("Could not find instructor");
    }
  }
  else {
    res.status(400);
    res.send(err);
  }
});
 
 
 
 
 
But be aware that with this you get all instructors with the given name and you have to select one from that array. If you want to save more courses to a instructor you have to change the schema: e.g.
 
 
 
 
 
  
var courseSchema = mongoose.Schema({
  // Schema variables
  ...

});

var courseModel = mongoose.model("Course", courseSchema);

var instructorlist = mongoose.Schema({
  name: {
    type: String,
    required: true
  },

  ...

  courses: [{
    type: ObjectId,
    ref: "Course"
  }]
});