【发布时间】：2015-06-19 02:20:48
【问题描述】：
更改了架构，一切都变得疯狂（请参阅下面的更改）。现在从 .find() 和 cursor.forEach() 访问属性在后端返回“未定义”：
编辑：找到了
.find().lean().exec(callback)
允许访问回调中的属性，但很难对它们做任何事情，并且通过这样做来访问属性
doc._doc.property
在回调中工作：
.find(function(err,doc){for (i in docs){doc=docs[i]; console.log(doc._doc.property)}}
and .forEach(function(doc){console.log(doc._doc.property)}:
我的架构曾经是这样的
用于收集人
{
name: String,
v: Types.ObjectId, ref: V //shorthand
r: {
e: [{}],
u: [{}]
}
}
现在是这个样子
var people = new mongoose.Schema (
{
name: String,
v: {type: mongoose.Schema.Types.ObjectId, ref: V}
r: {
e: [{type: mongoose.Schema.Types.ObjectId, ref: R}],
u: [{type: mongoose.Schema.Types.ObjectId, ref: R}]
}
}
)
mongoose.model('people',people);
用于收集r
var collR = new mongoose.Schema({}, {strict:false})
mongoose.model('R',collR)
nodejs 控制器 1：
module.exports.getProducts = function (req, res) {
people.find(req.query)
.populate('v r.e r.u')
.exec(function (err, data) {
if (err) {sendJsonResponse(res,400,err)}
else {
data.forEach(function(single){
single.r.e.forEach(function(sing){
console.log(sing) //defined, and i saw rating, and its defined
console.log(sing.rating); //undefined
// do something with sing.rating but it's undefined here
})
})
sendJsonResponse(res,200,data); //not undefined on frontend success callback
}
});
};
节点控制器 2：
module.exports.getProducts = function (req, res) {
people.find(req.query)
.populate('v r.e r.u')
.exec(function (err, data) {
if (err) {sendJsonResponse(res,400,err)}
else {
data.forEach(function(single){
R.find({person: single.name}, function (err, dat) {
dat.forEach(function(sing){
console.log(sing) //defined and rating defined
console.log(sing.rating); //undefined ugh.
//do something with rating but cant bc undefined here
})
})
})
//if i send data back here, in success callback, data[i].r.e[j].rating is defined for all i and j, whaaa!?!
}
});
};
从 cursor.forEach 循环中记录的歌曲之一---
{_id: 1254357653, name: peep, rating: 6, type: some type}
编辑：
是这样的：
collection.find(query).exec(function(err,docs) {
docs.forEach(function(singleDoc) {
console.log(singleDoc._doc.property); //DEFINED, bad boyz 4 lyfe *_*
})
})
所以我最终决定 console.log 从 cursor.forEach 返回的文档的该死键
这也返回定义：
collection.find(query).lean().exec(function(err,docs) {
console.log(docs[i].property); //for all i, THEY'RE DEFINED!!!!! wooo
})
现在当我尝试在查找中进行更新时会弹出另一个问题
collection.find(query).exec(function(err,docs) {
if (err) {return errorHandler(err)};
var doc = docs[0];
var captainKeyes = Object.keys(req.body);
for (k = 0 ; k < captainKeyes.length ; k++) {
//update the doc key/value pairs with what is sent in req.body
doc._doc[captainKeyes[k]] = req.body[captainKeyes[k]];
//from above, learned to access properties captainKeyes[k], you have to first access
//the hidden property _doc to get to actual doc
}
doc.save()
//old doc is still in db, damn. and all this used to work before
//we added that R collection :(
})
【问题讨论】：
-
你能分享
console.log(sing)的示例输出吗？ -
sing 是来自 r.e 路径或来自 R 集合的新模式中的文档，当集合被创建时：{_id: 1254357653, name: peep, rating: 6, type: some type} （记录 dat 数组的长度）。当没有创建 R 集合时，就像在我的第一个模式设计中一样，sing 是相同的，除了没有 _id 字段。