I have an collection doc like .
{'_id':1,
'name':'Root',
'taskId':1,
'parentId':"",
'path':[1],
'tasks':[ {"taskId":3,parentId:1,name:'A',status:'Created'},
{"taskId":4,parentId:1,name:'D',status:'Created'},
{"taskId":5,parentId:4,name:'B',status:'Created'},
{'type':'project' , 'proRef':2},
{"taskId":6,parentId:3,name:'E',status:'Started'},
{"taskId":7,parentId:6,name:'C',status:'Stopped'}]
}
Now I want to update multiple array element field ‘status’ to ‘Deleted’ which is inside JSON .Let us assume for taskId 3,4 I need to update status to Deleted . I have tried this query with $in with query($) but it is updating very first element is $in array only. In below query only taskId with 3 is getting updated not 4.
db.projectPlan.update({"_id": 1,'tasks.taskId': {$in :[3,4]}} , {$set: {'tasks.$.status': 'Deleted'}}, {upsert: false, multi: true});
How to update multiple elements in single query.Thanks in advance !!
I'm afraid it's not possible, it's a limitation of MongoDB. From the documentation (http://docs.mongodb.org/manual/reference/operator/update-array/):
$ Acts as a placeholder to update the first element that matches the
query condition in an update.
See this ticket for more details: https://jira.mongodb.org/browse/SERVER-1243
It's possible though in MongoDB shell:
db.projectPlan.find({"_id": 1}).forEach(function(plan) {
plan.tasks.forEach(function(task) {
if(task.taskId in { 3: 1, 4: 1 }) {
task.status = "Deleted";
}
});
db.projectPlan.save(plan);
});
Related
Say I'm fetching a user with a posts field. Each post has a field images. I want to populate the posts on the user, but only fetch the first image from each post. How can I do this? I've given the following as an example that does not work:
db.User.findOne().populate('posts', 'images.0')
You can use $slice projection operator to specifies the number of elements in an array to return in the query result.
db.User.findOne().populate('posts', { 'images': { '$slice': 1 } })
If you want to select direct string instead of array of string use $arrayElemAt or $first aggregation operator Starting from MongoDB 4.4,
$arrayElemAt
db.User.findOne().populate('posts', { 'images': { '$arrayElemAt': ["$images", 0] } })
$first
db.User.findOne().populate('posts', { 'images': { '$first': "$images" } })
I am new to MongoDB.
This is my 'masterpatients' collection it has many documents. every documents contain 'visits' array and every visits array contains multiple objects. I want only those object which is satisfied with my input.
I am expecting only below the expected output. if the facility match with my input and visit date range match with my provided input then the query should return only that object as I have given below.
_id:5ef59134a3d8d92e580510fe
flag:0
name:"emicon_test"
dob:2020-06-25T00:00:00.000+00:00
visits:[
{
visit:2020-06-09T10:36:10.635+00:00,
facility:"Atria Lady Lake"
},
{
visit:2020-05-09T10:36:10.635+00:00,
facility:"demo"
}]
_id:5ee3213040f8830e04ff74a8
flag:0
name:"xyz"
dob:1995-06-25T00:00:00.000+00:00
visits:[
{
visit:2020-05-01T10:36:10.635+00:00,
facility:"pqr"
},
{
visit:2020-05-15T10:36:10.635+00:00,
facility:"demo"
},
{
visit:2020-05-09T10:36:10.635+00:00,
facility:"efg"
}]
My query input parameters is facility='demo' and visit date range is from '1st May 2020' to '10th May 2020'
output expected:
_id:5ef59134a3d8d92e580510fe
flag:0
name:"emicon_test"
dob:2020-06-25T00:00:00.000+00:00
visits:[
{
visit:2020-05-09T10:36:10.635+00:00,
facility:"demo"
}]
Thanks in advance.
I got an answer.
MasterPatientModel.aggregate([
{
'$unwind':"$visits"
},
{"$match": {"visits.visit": {"$gte": new Date(req.body.facilitySummaryFromdate), "$lte": new Date(req.body.facilitySummaryTodate)
} , "visits.facility": req.body.facilitySummary
}
}
])
You cannot filter the contents of a mongo collection property on the server.
Make visits array into a top level collection/model and you can filter by criteria on the server.
I was trying to sort documents by last interaction. meta_data.access_times is an array that update every time when user interacts and new date object append to the last element of the array. Is there any way to sort by array's last element?
Attempt 1 :
private Aggregation makeQuery(String userId) {
return newAggregation(
match(Criteria.where("user_id").is(userId)),
sort(Sort.Direction.DESC, "$meta_data.access_times"),
group(Fields.fields().and("first_name", "$meta_data.user_data.first_name").and("last_name", "$meta_data.user_data.last_name").and("profile_pic", "$meta_data.user_data.profile_pic").and("user_id", "$user_id").and("access_times", "$meta_data.access_times"))
);
}
Attempt 2 :
private Aggregation makeQuery(String userId) {
return newAggregation(
match(Criteria.where("user_id").is(user_id)),
group(Fields.fields().and("first_name", "$meta_data.user_data.first_name").and("last_name", "$meta_data.user_data.last_name").and("profile_pic", "$meta_data.user_data.profile_pic").and("user_id", "$user_id")).max("$meta_data.access_times").as("access_time"),
sort(Sort.Direction.DESC, "access_time")
);
}
sample meta_data array in document
"meta_data" : { "access_times" : [
ISODate("2017-06-20T14:04:14.910Z"),
ISODate("2017-06-22T06:27:32.210Z"),
ISODate("2017-06-22T06:27:35.326Z"),
ISODate("2017-06-22T06:31:28.048Z"),
ISODate("2017-06-22T06:36:19.664Z"),
ISODate("2017-06-22T06:37:00.164Z")
] }
I solves the problem by using $unwind operation.
private Aggregation makeQuery(String userId) {
return newAggregation(
match(Criteria.where("user_id").is(userId)),
unwind("$meta_data.access_times"),
group(Fields.fields().and("first_name", "$meta_data.user_data.first_name").and("last_name", "$meta_data.user_data.last_name").and("profile_pic", "$meta_data.user_data.profile_pic").and("user_id", "$user_id")).max("$meta_data.access_times").as("access_time"),
sort(Sort.Direction.DESC, "access_time")
);
}
When you don't know if the element to Push is Ordered or not (for example, an User that is pushing him Score...) you can use $push and $sort in order to have an ordered array, then you can just sort by "find({userId:yourUseId}.sort("metadata.access_time.0":-1).
This solution suppose your array are Ordered with $sort at creation/update time: LINK
When you are sure that the Push don't need a sort (for example you are Pushing a Access_Date for that User) you can $push and void $sort by using $operator (tnx Erdenezul). LINK
In theory you don't need an Index on the Array "access_time" if the find() is fetching only fews documents. Otherwise you can just add an index with {"metadata.access_time.0": -1}.
Good Luck!
I have two collections in Mongo. For simplification I´m providing a minified example
Template Collection:
{
templateId:0,
values:[
{data:"a"},
{data:"b"},
{data:"c"}
{data:"e"}
]
}
Data Collection:
{
dataId:0,
templateId:0,
values:[
{data:"a",
value: 10},
{data:"b",
value: 120},
{data:"c",
value: 3220},
{data:"d",
value: 0}
]
}
I want to make a sync from Template Collection -> Data Collection, between the template 0 and all documents using that template. In the case of the example, that would mean:
Copy {data:"e"} into the arrays of all documents with the templateId: 0
Remove {data:"d"} from the arrays of all documents with the templateId: 0
BUT do not touch the rest of the items. I can´t simply replace the array, because those values have to be kept
I´ve found a solution for 1.
db.getCollection('data').update({templateId:0},
{$addToSet: {values: {
$each:[
{data:"a"},
{data:"b"},
{data:"c"}
{data:"e"}
]
}}}, {
multi: true}
)
And a partial solution for 2.
I got it. First tried with $pullAll, but the normal $pull seems to work together with the $nin operator
db.getCollection('data').update({templateId:"QNXC4bPAF9J6r9FQu"},
{$pull:{values: { $nin:[
{data:"a"},
{data:"b"},
{data:"c"}
{data:"e"}]
}}}, {
multi: true}
)
This will remove {data:"d"} from all document arrays, but it seems to overwrite the complete array, and this is not what I want, as those value entries need to be persisted
But how can I perform a query like Remove everything from an array EXCEPT/NOT IN [a,b,c,d,...] ?
I have an array of objects, and I want to query in a MongoDB collection for documents that have elements that match any objects in my array of objects.
For example:
var objects = ["52d58496e0dca1c710d9bfdd", "52d58da5e0dca1c710d9bfde", "52d91cd69188818e3964917b"];
db.scook.recipes.find({products: { $in: objects }}
However, I want to know if I can sort the results by the number of matches in MongoDB.
For example, at the top will be the "recipe" that has exactly three elements matches: ["52d58496e0dca1c710d9bfdd", "52d58da5e0dca1c710d9bfde", "52d91cd69188818e3964917b"].
The second selected has two recipes: i.e. ["52d58496e0dca1c710d9bfdd", "52d58da5e0dca1c710d9bfde"], and the third one only one: i.e. ["52d58496e0dca1c710d9bfdd"]
It would be great if you could get the number of items it had.
By using the aggregation framework, I think that you should be able to get what you need by the following MongoDB query. However, if you're using Mongoose, you'll have to convert this to a Mongoose query. I'm not certain this will work exactly as is, so you may need to play with it a little to make it right. Also, this answer hinges on whether or not you can use the $or operator inside of the $project operator and that it will return true. If that doesn't work, I think you'll need to use map-reduce to get what you need or do it server side.
db.recipes.aggregate(
// look for matches
{ $match : { products : { $or : objects }}},
// break apart documents to by the products subdocuments
{ $unwind : "$products" },
// search for matches in the sub documents and add productMatch if a match is found
{ $project : {
desiredField1 : 1,
desiredField2 : 1,
products : 1,
// this may not be a valid comparison, but should hopefully
// be true or 1 if there is a match
productMatch : { "$products" : { $or : objects }}
}},
// group the unwound documents back together by _id
{ $group : {
_id : "$_id",
products : { $push : "$products" },
// count the matched objects
numMatches : { $sum : "$productMatch" },
// increment by 1 for each product
numProducts : { $sum : 1 }
}},
// sort by descending order by numMatches
{ $sort : { numMatches : -1 }}
)