[英]Expressjs & MongoDB update object in collection's array
I want to update collection's array, I have problems with finding object in collection's array and pushing new values to object, I tried few thing but then It seems I cannot use collection method on array? 我想更新集合的数组,我在集合的数组中查找对象并将新值推送到对象时遇到问题,我尝试了几件事,但是看来我不能在数组上使用集合方法了吗?
router.post('/mountain_rescue_update', function(req, res) {
var collection = db.collection('rescuemodels');
var id = req.body.id;
collection.update({"type": "FeatureCollection"},function (err, doc) {
if (doc) {
doc.find({"features": []}, function (err, result) {
if (err) throw err;
res.send(result);
});
}
});
});
In FeatureCollection i have array features, i want to do find method on that array and find object by id and then make push if it is possible. 在FeatureCollection中,我具有数组功能,我想在该数组上执行find方法并通过id查找对象,然后在可能的情况下进行推送。
Actually How to find array? 其实如何找到数组? so some operations like find and update can be done on that array. 因此可以在该阵列上执行诸如查找和更新之类的某些操作。 I now that expression features: [] looks incorrectly but i don't have idea how to find it. 我现在该表达式具有以下功能:[]看起来不正确,但是我不知道如何找到它。
I tried something like this 我尝试过这样的事情
collection.find({"features":{"properties":{"date":id}}}, function(err,doc){
console.log(doc);
}
If collection has one document which have array features? 如果集合具有一个具有数组功能的文档? Shouldn't it work? 不行吗
In mongodb i found 在mongodb中,我发现
db.rescuemodels.find({"features.properties":{"title":"Wild Wolfs"}})
So it should look into collection features and give result of all objects which properties.title is Wild Wolfs? 因此,它应该研究集合特征并给出所有对象的结果,其中properties.title是Wild Wolfs?
My json 我的json
{
"_id" : ObjectId("54f50753a879d4e045b24878"),
"features" : [
{
"properties" : {
"title" : "Alona 45D",
"description" : "...",
"date" : ISODate("2015-03-03T01:00:40.842Z"),
"urgency" : "Low",
"phone" : "675 675 345",
"completion" : "NO",
"rescuer" : "Aleksander Gagarin"
},
"geometry" : {
"coordinates" : [
11.2637333,
23.1135565
],
"type" : "Point"
},
"type" : "Feature"
},...etc
],
"type" : "FeatureCollection",
"__v" : 0
}
Ok I succeeded with finding object in document's array, So now just replacing some properties left. 好的,我成功地在文档数组中找到了对象,所以现在只需替换一些属性即可。
db.rescuemodels.find({"type":"FeatureCollection"},{"features": {$elemMatch:{"properties.title":"W"}}})
Maybe somebody know how to make this statement ok 也许有人知道如何使这个陈述正确
db.rescuemodels.update({"type":"FeatureCollection"},{"features":{$elemMatch:{"properties.title":"W"}}},{$set:{"features":{"properties":{"title":"XXX"}}}})
You probably want to use findOneByIdAndUpdate. 您可能要使用findOneByIdAndUpdate。 In terms of working with Arrays in mongodb, for adding the item to an array you want to use $push and to remove an item from an array, you want to use $pull. 就在mongodb中使用数组而言,要将项添加到要使用$ push的数组中并从数组中删除项,需要使用$ pull。
http://docs.mongodb.org/manual/reference/operator/update/push/ http://docs.mongodb.org/manual/reference/operator/update/push/
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