Question

以下是尝试将用户添加到架构的代码：

var roomSchema = new Schema({
    name: { type: String, required: true},
    connections: { type: [ { userId: String } ] },
    content: { type: String, default: ""},
    isFull: { type: Boolean, default: false}
});

roomSchema.methods.addUser = function(username, callback) {
this.updateAsync( { $push: { connections: { userId: username }  } } )
.then(function(status) {
    return this.saveAsync();
})
.catch(function(afterPushErr) {
    console.log('After push error');
    throw afterPushErr;
})
.catch(function(saveErr) {
    console.log('save Error');
    throw saveErr;
});

Promise.all(this.connections)
.then(function() {
    if(this.connections.length >= 5) {
        this.updateAsync( { isFull: true })
        .then(function(status) {
            return;
        })
        .catch(function(updateErr) {
            console.log('update Error!');
            throw updateErr;
        });
    }
});

}

然后调用它的代码（正确导入上面的函数）：（注意：这只是一个快速测试功能，以确保每个房间最多只有5个用户）

var populateRooms = function() {
    var names = [
        'asas',
        'asas2',
        'asas3',
        'asas4',
        'asas5',
        'asas6'];

    var emails = [
        'asas@as.ca',
        'asas2@as.ca',
        'asas3@as.ca',
        'asas4@as.ca',
        'asas5@as.ca',
        'asas6@as.ca'];

    for(var i=0; i<6; ++i) {
    Room.findOneAsync( { isFull: false })
        .then(function(freeRoom) {
            var newUser = new User({
                username : names[i],
                email : emails[i],
                password : 'Asasas1',
                isPlaced: true,
                roomName: freeRoom.name
            });
            freeRoom.addUser(newUser.username);
            return newUser;
        })
        .then(function(newUser) {
            newUser.saveAsync();
        })
        .catch(function(err) {
            throw err;
        });
    }
    return true;
}

我通常会在控制台中看到的只是推送的最后一个用户而不是整个列表，因此我无法看到列表的长度是否为＆gt; =。

在mongo控制台上，我看到了房间架构：

{ "_id" : ObjectId("5882c3eefab3081700444972"), "name" : "1484964846968_0", "isFull" : false, "content" : "", "connections" : [ { "userId" : "asas5", "_id" : ObjectId("5882c3effab308170044497f") }, { "userId" : "asas6", "_id" : ObjectId("5882c3effab308170044497d") }, { "userId" : "asas4", "_id" : ObjectId("5882c3effab3081700444981") }, { "userId" : "asas6", "_id" : ObjectId("5882c3effab308170044497d") }, { "userId" : "asas5", "_id" : ObjectId("5882c3effab308170044497f") }, { "userId" : "asas4", "_id" : ObjectId("5882c3effab3081700444981") }, { "userId" : "asas3", "_id" : ObjectId("5882c3effab3081700444983") }, { "userId" : "asas", "_id" : ObjectId("5882c3effab3081700444987") }, { "userId" : "asas2", "_id" : ObjectId("5882c3effab3081700444985") }, { "userId" : "asas3", "_id" : ObjectId("5882c3effab3081700444983") }, { "userId" : "asas2", "_id" : ObjectId("5882c3effab3081700444985") }, { "userId" : "asas", "_id" : ObjectId("5882c3effab3081700444987") } ], "__v" : 12 } { "_id" : ObjectId("5882c3eefab3081700444973"), "name" : "1484964846978_1", "isFull" : false, "content" : "", "connections" : [ ], "__v" : 0 } { "_id" : ObjectId("5882c3eefab3081700444974"), "name" : "1484964846980_2", "isFull" : false, "content" : "", "connections" : [ ], "__v" : 0 } { "_id" : ObjectId("5882c3eefab3081700444975"), "name" : "1484964846980_3", "isFull" : false, "content" : "", "connections" : [ ], "__v" : 0 } { "_id" : ObjectId("5882c3eefab3081700444976"), "name" : "1484964846981_4", "isFull" : false, "content" : "", "connections" : [ ], "__v" : 0 } { "_id" : ObjectId("5882c3eefab3081700444977"), "name" : "1484964846981_5", "isFull" : false, "content" : "", "connections" : [ ], "__v" : 0 } { "_id" : ObjectId("5882c3eefab3081700444978"), "name" : "1484964846982_6", "isFull" : false, "content" : "", "connections" : [ ], "__v" : 0 } { "_id" : ObjectId("5882c3eefab3081700444979"), "name" : "1484964846984_7", "isFull" : false, "content" : "", "connections" : [ ], "__v" : 0 } { "_id" : ObjectId("5882c3eefab308170044497a"), "name" : "1484964846984_8", "isFull" : false, "content" : "", "connections" : [ ], "__v" : 0 } { "_id" : ObjectId("5882c3eefab308170044497b"), "name" : "1484964846984_9", "isFull" : false, "content" : "", "connections" : [ ], "__v" : 0 }

修改这是addUser的承诺代码的新错误

（node：4648）UnhandledPromiseRejectionWarning：未处理的承诺 rejection（拒绝id：1）：TypeError：无法读取属性未定义的'连接'（节点：4648） UnhandledPromiseRejectionWarning：未处理的承诺拒绝（rejection id：2）：TypeError：无法读取属性'connections' undefined推送错误推送错误后保存错误保存错误未处理的拒绝TypeError：无法读取属性'saveAsync' 未定义在C：\ someApp \ app \ models \ room-model.js：19：14 在tryCatcher（C：\ someApp \ node_modules \ bluebird \ js \ release \ util.js：16：23）

Answer 1

在测试函数中，您将异步调用（x）放在for循环中。因此，每个循环都得到相同的Room.findOne。（这不是你想要的）

请检查此问题：Asynchronous Process inside a javascript for loop

freeZoom函数中的另一个建议this.update也是异步的，在某些情况下可能不会像你想要的那样。

使用.push（）时，数组类型的mongodb字段不会更新长度

1 个答案: