[英]MongoDB: Updating A specific array element in a sub document
I'm a novice with mongodb so please excuse me if the question is a little basic. 我是mongodb的新手,所以如果问题有点基本,请原谅。 I have a mongo collection with a relatively complex document structure.
我有一个具有相对复杂的文档结构的mongo集合。 The documents contain sub documents and arrays.
这些文档包含子文档和数组。 I need to add additional data to some of the documents in this collection.
我需要向此集合中的某些文档中添加其他数据。 A cut down version of the document is:
该文档的简化版本为:
"date" : ISODate("2018-08-07T08:00:00.000+0000"),
.
. <<-- Other fields
.
"basket" :
[
{
"assetId" : NumberInt(639),
"securityId" : NumberInt(12470),
.
. <<-- Other fields
.
"exGroup" : [
. << -- Fields......
.
. << -- New Data will go here
]
}
.
. << More elements
]
The following (abridged) aggregation query finds the documents that need modifying: 以下(摘要)聚合查询查找需要修改的文档:
{
"$match" : {
"date" : {
"$gte" : ISODate("2018-08-07T00:00:00.000+0000"),
"$lt" : ISODate("2018-08-08T00:00:00.000+0000")
}
}
},
{
"$unwind" : {
"path" : "$basket"
}
},
{
"$unwind" : {
"path" : "$basket.exGroup"
}
},
{
"$project" : {
"_id" : 1.0,
"date" : 1.0,
"assetId" : "$basket.assetId",
"securityId" : "$basket.securityId",
"exGroup" : "$basket.exGroup"
}
},
{
"$unwind" : {
"path" : "$exGroup"
}
},
{
"$match" : {
"exGroup.order" : {
"$exists" : true
}
}
}
For each document returned by the mongo query I need to (in python) retrieve a set of additional data from a SQL database and then append this data to the original mongo document as shown above. 对于mongo查询返回的每个文档,我需要(在python中)从SQL数据库中检索一组附加数据,然后将此数据附加到原始mongo文档中,如上所示。 The set of new fields will be the same, the data will be different.
新字段的集合将相同,数据将不同。 What is not clear to me is how, once I have the data I go about updating the array values.
对我来说还不清楚的是,一旦获得数据,我将如何更新数组值。
Could somebody give me a pointer? 有人可以给我指点吗?
Try this, it works for me! 试试这个,对我有用!
mySchema.aggregate([
//your aggregation code
],function(err, docList){
//for each doc in docList
async.each(docList, function(doc, callback){
query = {$and:[{idField:doc.idField},{"myArray.ArrayId":doc.myArray.ArrayId}]}
//Update or create field in array
update = {$set:"myArray.$.FieldNameToCreateOrUpdate":value}}
projection = {field1:1, field2:1, field3:1}
mySchema.findOneAndUpdate(query, update, projection, function(err, done){
if(err){callback(err,null)}
callback(null,'done')
})
,function(err){
//code if error
//code if no error
}
})
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