I have the below document which contains double nested array format. I have to update the "level" field to "Senior Engineer" when the "someKey":"somevalue" and "Company":"Company1" and "Name":"Nandhi".
Document
{
"_id" : "777",
"someKey" : "someValue",
"someArray" : [
{
"Company" : "Company1",
"someNestedArray" : [
{
"name" : "Nandhi",
"level" : "Junior Engineer"
},
{
"name" : "Rajan",
"level" : "Senio Engineer"
}
]
}],
{
"Company" : "Company2",
"someNestedArray" : [
{
"name" : "Nandhi",
"level" : "Junior Engineer"
},
{
"name" : "Rajan",
"level" : "Senio Engineer"
}
]
}
]
}
Update Query I tried
db.Test123.updateOne(
{"someKey" : "someValue","someArray.Company":"Company1"},
{$set:{"someArray.$[someNestedArray].level":"Senior Developer"}},
{arrayFilters:[{"someNestedArray.name":"Nandhi"}]}
);
Output Screenshot
As you can seen that, the modifiedCount returns 0. Please advice on this!
You need to define arrayFilter for every level of nesting, try:
db.Test123.update(
{ "someKey" : "someValue" },
{ "$set": { "someArray.$[someArrayDoc].someNestedArray.$[someNestedArrayDoc].level": "Senior Developer" } },
{ arrayFilters: [ {"someArrayDoc.Company": "Company1"}, { "someNestedArrayDoc.name": "Nandhi" } ] }
)
Related
I want to remove a topic by id from the following collection. Here is the hierarchy of the collection - Area.
Area ---
|
---Subjects---
|
Courses---
|
Chapters----
|
Topics
The Area example is as following.
{
"_id" : ObjectId("607f7c67f64e993a5c9b9793"),
"name" : "Automatic Engineering",
"description" : "this is the description.",
"created" : ISODate("2021-04-21T01:14:15.736Z"),
"subjects" : [
{
"description" : "dddd",
"name" : "Transfer Function",
"_id" : ObjectId("607f7c7af64e993a5c9b9794"),
"created" : ISODate("2021-04-21T01:14:34.943Z"),
"courses" : [
{
"description" : "dddd",
"name" : "conception",
"_id" : ObjectId("607f7c9af64e993a5c9b9796"),
"created" : ISODate("2021-04-21T01:15:06.696Z"),
"chapters" : [
{
"description" : "chapter 1",
"name" : "Chapter 1",
"_id" : ObjectId("607f7cb4f64e993a5c9b9798"),
"created" : ISODate("2021-04-21T01:15:32.855Z"),
"topics" : [
{
"description" : "1",
"name" : "Topic 1",
"_id" : ObjectId("607f7ccef64e993a5c9b979b"),
"created" : ISODate("2021-04-21T01:15:58.064Z")
},
{
"description" : "2",
"name" : "Topic 2",
"_id" : ObjectId("607f7cd5f64e993a5c9b979c"),
"created" : ISODate("2021-04-21T01:16:05.663Z")
},
{
"description" : "3",
"name" : "Topic 3",
"_id" : ObjectId("607f7cdcf64e993a5c9b979d"),
"created" : ISODate("2021-04-21T01:16:12.336Z")
}
]
},
{
"description" : "chapter2",
"name" : "Chapter 2",
"_id" : ObjectId("607f7cbcf64e993a5c9b9799"),
"created" : ISODate("2021-04-21T01:15:40.231Z"),
"topics" : []
},
{
"description" : "chapter 3",
"name" : "Chapter 3",
"_id" : ObjectId("607f7cc5f64e993a5c9b979a"),
"created" : ISODate("2021-04-21T01:15:49.000Z"),
"topics" : []
}
]
},
{
"description" : "dddd",
"name" : "exercise",
"_id" : ObjectId("607f7ca6f64e993a5c9b9797"),
"created" : ISODate("2021-04-21T01:15:18.465Z"),
"chapters" : []
}
]
},
{
"description" : "this is the example",
"name" : "State Space Equation",
"_id" : ObjectId("607f7c8ef64e993a5c9b9795"),
"created" : ISODate("2021-04-21T01:14:54.056Z"),
"courses" : []
}
],
"__v" : 0
}
And I need to remove topic object in chapters array. So this is what I have done.
areaModel.findOneAndUpdate({
'_id': req.body.area_id,
'subjects._id': req.body.subject_id,
'courses._id': req.body.course_id,
'chapter._id': req.body.chapter_id
}, {
"$pull": {
"subjects.$.courses.$.chapters.$.topics": {
_id: req.body.topic_id
}
}
}, (err, result) =>{
if (err) {
return res.json({success: false, msg: err});
} else {
return res.json({success: true, msg:"successfully removed" });
}
});
By using $pull method of mongoose, I could remove the course from the area easily. But it was impossible for me to remove the more nested items like chapters and topics.
How can I solve this issue?
you can do so with the use of arrayFilters like so:
db.collection.updateOne(
{
_id: ObjectId("607f7c67f64e993a5c9b9793")
},
{
$pull: {
"subjects.$[s].courses.$[c].chapters.$[ch].topics": {
_id: ObjectId("607f7ccef64e993a5c9b979b")
}
}
},
{
arrayFilters: [
{
"s._id": { $eq: ObjectId("607f7c7af64e993a5c9b9794") }
},
{
"c._id": { $eq: ObjectId("607f7c9af64e993a5c9b9796") }
},
{
"ch._id": { $eq: ObjectId("607f7cb4f64e993a5c9b9798") }
}
]
})
https://mongoplayground.net/p/kVyV27nnkII
Try it:
areaModel.findOneAndUpdate(
{ _id: req.body.area_id },
{
$pull: {
"subjects.$[].courses.$[].chapters.$[].topics": {
_id: req.body.topic_id,
},
},
}
);
I'm taking a reference from : Spring Data Mongo - Perform Distinct, but doesn't wants to pull embedded documents in results and asking another questions.
I want to find technology list where "subdeptCd" : "1D". How can we do that ?
{
"firstName" : "Laxmi",
"lastName" : "Dekate",
.....
.......
.....
"departments" : {
"deptCd" : "Tax",
"deptName" : "Tax Handling Dept",
"status" : "A",
"subdepts" : [
{
"subdeptCd" : "1D",
"subdeptName" : "Tax Clearning",
"desc" : "",
"status" : "A"
"technology" : [
{
"technologyCd" : "4C",
"technologyName" : "Cloud Computing",
"desc" : "This is best certficate",
"status" : "A"
}
]
}
]
},
},
{
"firstName" : "Neha",
"lastName" : "Parate",
.....
.......
.....
"departments" : {
"deptCd" : "Tax Rebate",
"deptName" : "Tax Rebate Handling Dept",
"status" : "A",
"subdepts" : [
{
"subdeptCd" : "1D",
"subdeptName" : "Tax Clearning",
"desc" : "",
"status" : "A"
"technology" : [
{
"technologyCd" : "9C",
"technologyName" : "Spring Cloud",
"desc" : "This is best certficate post Google",
"status" : "A"
}
]
}
]
},
}
You can get distinct technologies (technology array elements) with this aggregation:
db.depts.aggregate( [
{
$unwind: "$departments.subdepts"
},
{
$unwind: "$departments.subdepts.technology"
},
{
$match: { "departments.subdepts.subdeptCd": "1D" }
},
{
$group: { _id: "$departments.subdepts.technology.technologyCd", tech: { $first: "$departments.subdepts.technology" } }
},
{
$replaceRoot: { newRoot: "$tech" }
}
] )
Find documents with duplicated objects inside an array.
Some answers works just with array made of "basic type elements" (i.e. array of strings). Here I want to filter on certain objects fields
In example:
{
"name": "1",
"arr": [{ "type": "fruit", "name":"pear"},{ "type": "fruit","name":"banana"}]
},
{
"name":"2",
"arr": [{"type":"fish"}]
}
Given the above two documents, I want to retrieve just document 1, because it has 2 elements in the array that have the same type. (Of course I want all documents with such property, not just one)
The following query can get us the expected output:
db.collection.find({
$expr:{
$ne:[
{
$size:"$arr"
},
{
$size:{
$setUnion:["$arr.type"]
}
}
]
}
}).pretty()
Data set:
{
"_id" : ObjectId("5d7b8546d76ccfa3cb0f133c"),
"name" : "1",
"arr" : [
{
"type" : "fruit",
"name" : "pear"
},
{
"type" : "fruit",
"name" : "banana"
}
]
}
{
"_id" : ObjectId("5d7b8546d76ccfa3cb0f133d"),
"name" : "2",
"arr" : [
{
"type" : "fish"
}
]
}
{
"_id" : ObjectId("5d7b8546d76ccfa3cb0f133e"),
"name" : "3",
"arr" : [
{
"type" : "product",
"name" : "watch"
},
{
"type" : "product",
"name" : "Pen"
}
]
}
Output:
{
"_id" : ObjectId("5d7b8546d76ccfa3cb0f133c"),
"name" : "1",
"arr" : [
{
"type" : "fruit",
"name" : "pear"
},
{
"type" : "fruit",
"name" : "banana"
}
]
}
{
"_id" : ObjectId("5d7b8546d76ccfa3cb0f133e"),
"name" : "3",
"arr" : [
{
"type" : "product",
"name" : "watch"
},
{
"type" : "product",
"name" : "Pen"
}
]
}
Query analysis: We are filtering documents in which the size of arr is not equal to the count of unique type present in the arr
I am trying to port an existing SQL schema into Mongo.
We have document tables, with sometimes several times the same document, with a different revision but the same reference. I want to get only the latest revisions of the documents.
A sample input data:
{
"Uid" : "xxx",
"status" : "ACCEPTED",
"reference" : "DOC305",
"code" : "305-D",
"title" : "Document 305",
"creationdate" : ISODate("2011-11-24T15:13:28.887Z"),
"creator" : "X"
},
{
"Uid" : "xxx",
"status" : "COMMENTED",
"reference" : "DOC306",
"code" : "306-A",
"title" : "Document 306",
"creationdate" : ISODate("2011-11-28T07:23:18.807Z"),
"creator" : "X"
},
{
"Uid" : "xxx",
"status" : "COMMENTED",
"reference" : "DOC306",
"code" : "306-B",
"title" : "Document 306",
"creationdate" : ISODate("2011-11-28T07:26:49.447Z"),
"creator" : "X"
},
{
"Uid" : "xxx",
"status" : "ACCEPTED",
"reference" : "DOC501",
"code" : "501-A",
"title" : "Document 501",
"creationdate" : ISODate("2011-11-19T06:30:35.757Z"),
"creator" : "X"
},
{
"Uid" : "xxx",
"status" : "ACCEPTED",
"reference" : "DOC501",
"code" : "501-B",
"title" : "Document 501",
"creationdate" : ISODate("2011-11-19T06:40:32.957Z"),
"creator" : "X"
}
Given this data, I want this result set (sometimes I want only the last revision, sometimes I want all revisions with an attribute telling me whether it's the latest):
{
"Uid" : "xxx",
"status" : "ACCEPTED",
"reference" : "DOC305",
"code" : "305-D",
"title" : "Document 305",
"creationdate" : ISODate("2011-11-24T15:13:28.887Z"),
"creator" : "X",
"lastrev" : true
},
{
"Uid" : "xxx",
"status" : "COMMENTED",
"reference" : "DOC306",
"code" : "306-B",
"title" : "Document 306",
"creationdate" : ISODate("2011-11-28T07:26:49.447Z"),
"creator" : "X",
"lastrev" : true
},
{
"Uid" : "xxx",
"status" : "ACCEPTED",
"reference" : "DOC501",
"code" : "501-B",
"title" : "Document 501",
"creationdate" : ISODate("2011-11-19T06:40:32.957Z"),
"creator" : "X",
"lastrev" : true
}
I already have a bunch of filters, sorting, and skip/limit (for pagination of data), so the final result set should be mindful of these constraints.
The current "find" query (built with the .Net driver), which filters fine but gives me all revisions of each document:
coll.find(
{ "$and" : [
{ "$or" : [
{ "deletedid" : { "$exists" : false } },
{ "deletedid" : null }
] },
{ "$or" : [
{ "taskid" : { "$exists" : false } },
{ "taskid" : null }
] },
{ "objecttypeuid" : { "$in" : ["xxxxx"] } }
] },
{ "_id" : 0, "Uid" : 1, "lastrev" : 1, "title" : 1, "code" : 1, "creator" : 1, "owner" : 1, "modificator" : 1, "status" : 1, "reference": 1, "creationdate": 1 }
).sort({ "creationdate" : 1 }).skip(0).limit(10);
Using another question, I have been able to build this aggregation, which gives me the latest revision of each document, but with not enough attributes in the result:
coll.aggregate([
{ $sort: { "creationdate": 1 } },
{
$group: {
"_id": "$reference",
result: { $last: "$creationdate" },
creationdate: { $last: "$creationdate" }
}
}
]);
I would like to integrating the aggregate with the find query.
I have found the way to mix aggregation and filtering:
coll.aggregate(
[
{ $match: {
"$and" : [
{ "$or" : [
{ "deletedid" : { "$exists" : false } },
{ "deletedid" : null }
] },
{ "$or" : [
{ "taskid" : { "$exists" : false } },
{ "taskid" : null }
] },
{ "objecttypeuid" : { "$in" : ["xxx"] } }
]
}
},
{ $sort: { "creationdate": 1 } },
{ $group: {
"_id": "$reference",
"doc": { "$last": "$$ROOT" }
}
},
{ $sort: { "doc.creationdate": 1 } },
{ $skip: skip },
{ $limit: limit }
],
{ allowDiskUse: true }
);
For each result node, this gives me a "doc" node with the document data. It has too much data still (it's missing projections), but it's a start.
Translated in .Net:
FilterDefinitionBuilder<BsonDocument> filterBuilder = Builders<BsonDocument>.Filter;
FilterDefinition<BsonDocument> filters = filterBuilder.Empty;
filters = filters & (filterBuilder.Not(filterBuilder.Exists("deletedid")) | filterBuilder.Eq("deletedid", BsonNull.Value));
filters = filters & (filterBuilder.Not(filterBuilder.Exists("taskid")) | filterBuilder.Eq("taskid", BsonNull.Value));
foreach (var f in fieldFilters) {
filters = filters & filterBuilder.In(f.Key, f.Value);
}
var sort = Builders<BsonDocument>.Sort.Ascending(orderby);
var group = new BsonDocument {
{ "_id", "$reference" },
{ "doc", new BsonDocument("$last", "$$ROOT") }
};
var aggregate = coll.Aggregate(new AggregateOptions { AllowDiskUse = true })
.Match(filters)
.Sort(sort)
.Group(group)
.Sort(sort)
.Skip(skip)
.Limit(rows);
return aggregate.ToList();
I'm pretty sure there are better ways to do this, though.
You answer is pretty close. Instead of $last, $max is better.
About $last operator:
Returns the value that results from applying an expression to the last document in a group of documents that share the same group by a field. Only meaningful when documents are in a defined order.
Get the last revision in each group, see code below in mongo shell:
db.collection.aggregate([
{
$group: {
_id: '$reference',
doc: {
$max: {
"creationdate" : "$creationdate",
"code" : "$code",
"Uid" : "$Uid",
"status" : "$status",
"title" : "$title",
"creator" : "$creator"
}
}
}
},
{
$project: {
_id: 0,
Uid: "$doc.Uid",
status: "$doc.status",
reference: "$_id",
code: "$doc.code",
title: "$doc.title",
creationdate: "$doc.creationdate",
creator: "$doc.creator"
}
}
]).pretty()
The output as your expect:
{
"Uid" : "xxx",
"status" : "ACCEPTED",
"reference" : "DOC501",
"code" : "501-B",
"title" : "Document 501",
"creationdate" : ISODate("2011-11-19T06:40:32.957Z"),
"creator" : "X"
}
{
"Uid" : "xxx",
"status" : "COMMENTED",
"reference" : "DOC306",
"code" : "306-B",
"title" : "Document 306",
"creationdate" : ISODate("2011-11-28T07:26:49.447Z"),
"creator" : "X"
}
{
"Uid" : "xxx",
"status" : "ACCEPTED",
"reference" : "DOC305",
"code" : "305-D",
"title" : "Document 305",
"creationdate" : ISODate("2011-11-24T15:13:28.887Z"),
"creator" : "X"
}
I have the collection named companies as below.
I want to query the url corresponding to C1S1category1 . I do not know which companyName it belongs and which catergories it belongs to.
Please can you let me know what query I need to use in Mongoshell to query the document having catergoryname as C1S1category1
{"companyName": "C1",
"url": "www.com1",
"categories" : [
{"SlNo" : 1,
"url" : "www.com1",
"subcategories" : [
{
"CatergoryName":"C1S1category1",
"Url" : "www.com3"
},
{
"CatergoryName":"C1S1category2",
"Url" : "www.com3"
}
]
},
{
"SlNo" : 2,
"url" : "www.com1",
"subcategories" : [
{
"CatergoryName":"C1S2category1",
"Url" : "www.com3"
},
{
"CatergoryName":"C1S2category2",
"Url" : "www.com3"
}
]
}
]
},
{"companyName": "C2",
"url": "www.com21",
"categories" : [
{"SlNo" : 1,
"url" : "www.com22",
"subcategories" : [
{
"CatergoryName":"C2S1category1",
"Url" : "www.com23"
},
{
"CatergoryName":"C2S1category2",
"Url" : "www.com23"
}
]
},
{
"SlNo" : 2,
"url" : "www.com1",
"subcategories" : [
{
"CatergoryName":"C2S2category1",
"Url" : "www.com23"
},
{
"CatergoryName":"C2S2category2",
"Url" : "www.com23"
}
]
}
]
}
You need to use $elemMatch to get required output as following:
db.collection.find({
"categories": {
$elemMatch: {
subcategories: {
$elemMatch: {
CatergoryName: "C1S1category1"
}
}
}
}
},{"categories.$":1,"companyName":1,"url":1}).pretty()