如何登录一个集合中的每个模型的某些领域 [英] How to log a certain field of every model in a collection

问题描述

喜IM从我的收藏试图输出每一个纬度字段。但是什么我做返回结果的正确数量，但他们都表示不确定，数据肯定是存在的，名字是绝对正确的。我用勇气和_.each用得到函数内试图和它曾经说，所有是不确定的。

Hi im trying to output every "lat" field from my collection. However anything i do returns the right number of results but they all say undefined, the data is definitely there and the names are definitely right. I've tried using pluck and _.each with a get inside the function and all it ever says is undefined.

这是当前的方法我尝试

var ccLocal = window.router.carsCollection;
_.each(ccLocal.models, function(model) {
    console.log(model.lat);
})

登录 ccLocal 返回它的所有数据，所以它肯定是有整个集合。我究竟做错了什么？

logging ccLocal returns the entire collection with all its data so its definitely there. What am i doing wrong?

使用 model.get（纬度）也失败了。

使用的console.log（ccLocal.at（0）.attributes）; 返回此

Object {unitID: "03_Cow_30", positionHistory: Array[1]}
positionHistory: Array[1]
0: Object
estimatedSpeed: "39"
isToday: false
lastSoundFileName: "F11"
lastSoundRange: "11"
lastSoundTime: "2008-10-29 20:38:25"
lat: "51.466227"
long: "-0.491647"
minutesAgo: 1016726
status: "1"
time: "2011-07-13 16:03:37"
__proto__: Object
length: 1
__proto__: Array[0]
unitID: "03_Cow_30"
__proto__: Object

推荐答案

啊，所以你的模型属性数据结构是不是大家想象。根据您的属性结构，你需要这样的事情。这是一个有点脆弱，由于假设positionHistory是至少有一个元素的数组，而这也正是您的数据。

Ah, so your model attributes data structure is not what everyone thought. Based on your attributes structure, you need something like this. It's a bit fragile due to assuming positionHistory is an array with at least one element, but that's where your data is.

var ccLocal = window.router.carsCollection;
_.each(ccLocal.models, function(model) {
   console.log(model.get('positionHistory')[0].lat);
})

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