Recent questions tagged MongoDB

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mongodb - Mongoose: deep population (populate a populated field)

I have Category model: Category: ... articles: [{type:ObjectId, ref:'Article'}] Article model contains ref to ... but no real solution was found See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb - meteor: how can I backup my mongo database

How can I make a backup of my meteor mongo database? If I run: meteor mongo the mongodump command does not work inside the meteor mongoshell See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb - How to stop mongo DB in one command

I need to be able to start/stop MongoDB on the cli. It is quite simple to start: ./mongod But to stop mongo ... mongo DB in one line. Any help? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb - Passing additional jars to Spark via spark-submit

I'm using Spark with MongoDB, and consequently rely on the mongo-hadoop drivers. I got things working thanks ... why sometimes and not others. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb - Mongo Aggregation : $group and $project array to object for counts

I have documents like: { "platform":"android", "install_date":20151029 } platform - can have one value from [ ... to single object as "platform" See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb - Specify Multiple Criteria for Array Elements

I am reading the docs for mongodb here, I am not able to understand these two commands and the different between ... conditions i.e. $lt:20? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb - Return the last "true" value for each group

I have collection in which documents are like: { _id: ObjectId(), user: ObjectId(), studentName: String, ... isAbandoned' is false for that. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb aggregate query isn't returning proper sum on using $sum

I have a collection students with documents in the following format:- { _id:"53fe74a866455060e003c2db", name:"sam", ... be doing wrong here? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb query - PyMongo $in + $regex

How can I combine $regex with $in in PyMongo? I want to search for either /*.heavy.*/ or /*.metal.*/. I tried in ... [ /heavy/, /metal/ ] } } ) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb - Mongo: how to sort by external weight

Following this question which @NeilLunn has gracefully answered, here is my problem in more detail. This is the set ... too much from mongo? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb : Increasing max connections in mongodb

i need your help in solving this this is the result of my ulimit -a on my linux server core file size (blocks ... my case , thanks in advance . See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb - Can't create working meteor.js project on a vagrant box

I cannot start up a new Meteor application on a Vagrant linux box (running on a Mac). It fails every ... is simply killed without explanation. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb - Poor lookup aggregation performance

I have two collections Posts: { "_Id": "1", "_PostTypeId": "1", "_AcceptedAnswerId": "192", "_CreationDate": ... that I messed up this query. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb - Mongo $in operator performance

Is it slow/poor form to use the $in operator in MongoDB with a large array of possibilities? posts. ... for reasonable-sized datasets? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb - Error: the update operation document must contain atomic operators, when running updateOne

In my collection, there is only one document. > db.c20160712.find() { "_id" : ObjectId("57ab909791c3b3a393e9e277"), ... My MongoDB is 3.2. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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932 views

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mongodb - How can I sort a Meteor collection by time of insertion?

I am working on my first project using Meteor, and am having some difficulty with sorting. I have a form where ... don't have many examples. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb - Mongoose limit/offset and count query

Bit of an odd one on query performance... I need to run a query which does a total count of documents, and can ... animals: animals}); }); }); See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb - Cannot authenticate into mongo, "auth fails"

I've created an admin user for mongo using these directions: http://docs.mongodb.org/manual/tutorial/add-user- ... conf. What am I missing? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb - Full text search with weight in mongoose

As I find out, since version 3.8.9, mongoose support full text search. But I can't find a good documentation for ... ? And how should I do it? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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948 views

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mongodb - Mongoose's find method with $or condition does not work properly

Recently I start using MongoDB with Mongoose on Nodejs. When I use Model.find method with $or condition and _id ... shell, both work properly. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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795 views

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mongodb - Meteor: uploading file from client to Mongo collection vs file system vs GridFS

Meteor is great but it lacks native supports for traditional file uploading. There are several options to handle file ... and obtain an url. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.2k views

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mongodb - Dump Mongo Collection into JSON format

Is there any way to dump mongo collection into json format? Either on the shell or using java driver.I am ... the one with best performance. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb - What is the difference between save and insert in Mongo DB?

What is the difference between save and insert in Mongo DB? both looks the same db.users.save({username:" ... "google",password:"google123"}) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb service is not starting up

I've installed the mongodb 2.0.3, using the mongodb-10gen debian package. Everything went well, except the ... .js:84 exception: connect failed See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.2k views

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mongodb - Geospatial $near within current document field value

Take this query: { 'location' : { '$near' : [x,y], '$maxDistance' : this.field } } I want to ... current evaluated document. Is that possible? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb - Generating a Structure for Aggregation

So here's a question. What I want to do is generate a data structure given a set of input values. ... the good implementations. Happy coding. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.3k views

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mongodb - Create filter aggregation in spring

I recently started exploring Aggregation Framework in MongoDB with SpringData. I could Create following query i.e ... m doing something wrong. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.4k views

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mongodb - How to toggle a boolean field in one document with atomic operation?

Is there any way to toggle the boolean field of ONE document in MongoDB with atomic operation? Say, (In python) cl.update ... ": {"field": 1}}) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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