Recent questions tagged MongoDB

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mongodb - Group by values and conditions

Very new to mongo and having a little trouble getting my head around this problem. I have collection looking ... and then order the results? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb - Return the last Document From a Lookup

db.groups.aggregate([ { $lookup: { from: "posts", localField: "_id", foreignField: "group", as: "post" ... last added post into post collection See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb - DbRef with Mongoose - mongoose-dbref or populate?

I have the following 2 schemas: Company Event: var companyEventSchema = new Schema({ name : String, description ... would be more efficient? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb - Finding highest value from sub-arrays in documents

Let say I have the following collection: { _id: 1, Array: [ { K: "A", V: 8 }, { K: "B", V: ... returned to my client (like a normal query). See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb - Query mongo to detect value changes in time series

Im wondering if the following is possible in MongoDB. I have collection of documents that represent changes in ... wrongly marked as duplicate. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb - Selecting and updating a nested object by it's ObjectId in Mongoose.js

I'm having trouble with something that thought would be trivial in MongoDB with Mongoose. With a fairly simple ... any help you can offer. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb - can't connect to mongolab with node.js on heroku

I am having trouble making node.js and mongodb with mongolab work on heroku. I have read other issues like How do ... ; What am I doing wrong ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb - Using mongo with FLASK and python

I am trying to learn python, mongodb and flask and am using the VERY EXCELLENT blog from Miguel Grinberg who ... place to start to build stuff See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb remove all dates less than specified

I have the following data. { deviceID: 186, date: "2014-3-15" } { deviceID: 186, date: "2014-3- ... documents with a date lower than specified. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb - Should I use the "allowDiskUse" option in a product environment?

Should I use the allowDiskUse option when returned doc exceed 16MB limit in aggregation? Or should I alter ... core/aggregation-pipeline-limits/ See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb - mongo.so: > undefined symbol: php_json_encode in Unknown on line 0. After installation mongo driver for php

After installation of Mongo 2.6.0 which was successful, I tried to upgrade php mongo driver on ubuntu 12.04 with ... an idea how to fix this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb - query in mongo Shell gives SyntaxError: missing : after property

db.movieDetails.find( { year: 2013, imdb.rating: Pg-13, award.wins: 0 }, { title: 1, _id: 0 } ).pretty() ... ):1:60 Why? Thank you in advance! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb how to change default port

For my project I need to use mongodb on port 80. In fact I can't use the default mongodb port (27017). I ... all work fine. Can someone help me? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb - Use mongoexport with a --query for ISODate

I have this query but i′m getting a syntax error: unexpected identifier mongoexport --db ium --collection events -- ... what can it be wrong? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb - How to update embedded document in mongoose?

I've looked through the mongoose API, and many questions on SO and on the google group, and still can't figure out ... v0.0.11 node v0.4.10 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb - Too many open files while ensure index mongo

I would like to create text index on mongo collection. I write db.test1.ensureIndex({'text':'text'}) and then i ... MaxOSX 10.9.1. Please help. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb - Obtaining $group result with group count

Assuming I have a collection called "posts" (in reality it is a more complex collection, posts is too simple ... ? Any help is appreciated. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb - Spring Data Mongo - apply unique combination fields in embedded document

I'm working on Spring Boot v2.1.3.RELEASE & Spring Data Mongo. In this example, I want to apply ... build(); employeeRepository.save(employee); See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb - Mongo Triple Compound Index

If you have a double compound index { a : 1, b : 1}, it makes sense to me that the index won't be ... a multi-key index with good selectivity.) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb - Mongo convert embedded document to array

Is there a way to convert a nested document structure into an array? Below is an example: Input "experience" : { ... a better way of doing this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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2.4k views

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mongodb - Mongoose expires property not working properly

the answer So it turns out when I was testing using the expires property in Mongoose, I successfully set a TTL index ... (also tested in 2.6.7) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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909 views

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mongodb - How to join to two additional collections with conditions

select tb1.*,tb3 from tb1,tb2,tb3 where tb1.id=tb2.profile_id and tb2.field='<text>' and tb3.user_id = tb2 ... .. Any help will be appreciated.. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb - Calculate the average of fields in embedded documents/array

I want to calculate the rating_average field of this object with the rating fields inside the array ratings. Can you help me ... ": 3.5 } ] } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb - Can mongorestore take a single url argument instead of separate arguments?

If I have a mongo database URL of the following format mongodb://someUsername:[email protected]:27017/ ... .com/a/15865565/586086 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.3k views

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mongodb - best practice of django + PyMongo pooling?

I have a db = pymongo.Connection() call in Django's views.py for a simple MongoDB connection to ... max_pool_size parameter during connection? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.4k views

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mongodb - Getting "err" : "E11000 duplicate key error when inserting into mongo using the Java driver

Exception in thread "main" com.mongodb.MongoException$DuplicateKey: { "serverUsed" : "localhost/127.0.0.1: ... myIdMapCollection.insert(myObj); See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

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mongodb - Mongo find documents that do not contain a given value (using $not)

I have two items in MongoDB: {'title':'active item', 'tags':[ {'tag':'active'}, {'tag':'anothertag'} ... contain a given value in their tags? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.7k views

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mongodb - Get first element in array and return using Aggregate?

How can I get and return the first element in an array using a Mongo aggregation? I tried using this code: ... need to return the first element. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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