Question

我正在使用骨干构建应用程序，而且我无法有效地进行collection.fetch。有两个具体问题：

我需要使用fetch查询传递一些值，以便接收查询的控制器可以根据这些值构造SQL查询。
我希望能够从持久数据库中获取适当的值并将它们返回到集合中，以使集合保持最新。

这是我的代码：

//模型

class QuestionModel extends Backbone.Model{

    defaults(){
        return{
            type:true,
            question:" "
        };
    }
    idAttribute = "question";
    url = "question";
}

//收集

class SurveyCollection extends Backbone.Collection {
    constructor(options) {
        super(options);
        var self = this;
        this.on("add", function (model) {
            var self = model;
            model.save({}, {
                success: function () {
                    Log.success("Saved " +  self.get("question"));
                    app.views.indexView.render();
                },
                error: function () {
                    Log.failure("Saved " + self.get("question"));
                }
            });
        }, this);
        this.fetch();
    }

    model = QuestionModel;
    url = "survey";
}

//在视图中获取请求

this.collection.fetch({
    data:{
        values: 100,
        type: "normal"
    },
    success: function(collection, response) {
        _.each(collection.models, function(model) {
            Log.show(model.get("question"));
        })
    },
    error: function(err){
        Log.error("couldn't receive data");
    }
});

控制器：

index(req, res) {
    log.Log.show("Received index request : values = " + req.body.values + " type : " + req.body.type);
    sqlConnector.query('select * from question', function (err, rows, fields) {
        if (!err) {
            _.each(rows, function (row){
                log.Log.show("row : " + row);
            })
            res.send(rows);
        } else {
            log.Log.show("error : " + err);
            res.status(500).send(err);
        }
    });
}

目前，MySQL数据库包含4个问题值：

John
Jacob

当我加载页面时（即调用render（）和fetch（）时），

the browser console shows 2 values:
Jacob
Jacob

the server console shows

Received index request : values = undefined type : undefined
show rows; [object Object]
show rows; [object Object]

当我添加另一个值＆＃39; Jasmine＆＃39;然后再次调用fetch：

the browser console shows 2 values:
Jasmine
Jasmine
Jasmine

the server console shows

Received index request : values = undefined type : undefined
show rows; [object Object]
show rows; [object Object]
show rows; [object Object]

如果我添加其他价值＆＃39; Jeremy＆＃39;然后再次调用fetch：

the browser console shows 2 values:
Jeremy
Jeremy
Jeremy
Jeremy

the server console shows

Received index request : values = undefined type : undefined
show rows; [object Object]
show rows; [object Object]
show rows; [object Object]

我需要解决此问题，并确保在两端提取正确的值

无法在backbone + TypeScript中执行collection.fetch

0 个答案: