Recent questions tagged MongoDB

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mongodb - Mongoose aggregation query fails in Jest/Mockgoose test, works elsewhere

I'm trying to create some tests for my Mongoose models, and I can't figure out how to get the Jest/Mockgoose test ... 3.4.2 if that's relevant. 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 use aggregate function in meteor

I'm working on the following document { "_id" : 12, "firstName" : "wer", "People" : [ { "uuid" : " ... aggregate function in my meteor app.... 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 - Custom deserialization

I have collection with thousands of documents, in document there's field named Rate, problem is currently its type is ... convert N/A to 0? 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 - Index on ts field in oplog.rs is not updated

I have an application that reads the oplog.rs collection in a mongodb 2.2 replica set by querying on the ts ... the oplog being special. Thanks 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 connect to Atlas M0 (Free Tier) cluster correctly via Java driver?

Trying to connect Atlas cluster via Java driver using MongoDB version 3.6. So, I'm writting like: MongoClientURI ... ? I appreciate 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 - Lombok - java.lang.StackOverflowError: null on toString method

I have two classes Product and Categorie. When I would like to modify the list of products in categorie with ... to solve this issue? Thanks. 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 start mongo db on windows

I am new to mongo, and I am trying to install mongo on my windows system. I am following THIS tutorial, ... [initandlisten] dbexit: rc: 100 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 - Sorting aggregation addToSet result

Is there a way to get result of $addToSet as sorted array ? I tried to expand the pipeline and $unwind the array, sort it ... : "$dt"} }} ] ); 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 - Update an item in an array that is in an array

I have a document in a mongodb collection like this : { sessions : [ { issues : [ { id : "6e184c73-2926-46e9- ... I do this ? Thanks for 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 - How could I write aggregation without exceeds maximum document size?

I got exceeds maximum document size problem exception by the query as follows, pipe = [ {"$match": { " ... exceeds maximum document size (16MB) 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 - sparse indexes and null values in mongo

I'm not sure I understand sparse indexes correctly. I have a sparse unique index on fbId { "ns" : "mydb. ... index supposed to deal with 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 - rank leaderboard in mongo with surrounding players

how would I create a query to get both the current player's rank and the surrounding player ranks. For example, ... ranked, like 50,000th place. 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 - Are there any reasons why I should/shouldn't use ObjectId's in my RESTful url's

I'm using mongoDB for the first time in a RESTful service. Previously the id column in my SQL databases was an ... column and use this for urls? 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 pass environment variable to mongo script

I want to pass the environment variable named file_path to js file. I am using the following syntax: mongo -- ... only it pass the argument. 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 - PyMongo transaction error:Transaction numbers are only allowed on a replica set member or mongos

When I am using pymongo 3.7 transaction function to connect to mongo server 4.0, this error "Transaction numbers ... help me with this problem? 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 - 'upsert' in an embedded document

I currently have the following dataset: { 'component_id':1, '_locales':[ { 'url': 'dutch', 'locale': 'nl_NL ... will not work with 'upserting'. 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 return JSON data from php MongoCursor

I am using PHP to connect with MongoDB. My code is as follows. // connect $m = new MongoClient($con_string); // ... HTML. How can i do this? 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 get the object id in PyMongo after an insert?

I'm doing a simple insert into Mongo... db.notes.insert({ title: "title", details: "note details"}) After the ... go, I have not yet tried 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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mongodb - What's the difference between insert(), insertOne(), and insertMany() method?

What's the difference between insert(), insertOne(), and insertMany() methods on MongoDB. In what situation should ... clear when use each one. 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 - using Populate on an array of ObjectId

I've got a schema that looks a bit like: var conversationSchema = new Schema({ created: { type: Date, default: ... there a way I can do this? 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 - Conditional grouping with $exists inside $cond

I have two keys A and B and their existence in the document is mutually exclusive. I have to group by A when A ... } ... What's going 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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mongodb - Meteor without mongo

With 0.6.5 release it is possible to develop non web apps with meteor. I rebuild it from scratch for ... must be implemented sooner or later. See Question&Answers more detail:os...

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

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981 views

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mongodb - querying a collection without passing schema in mongoose

Do i understand correctly, that if i want to query a collection, i have to do the following: var mongoose ... something like db.Kittens.find()? 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 find documents searching by ObjectId using Mongoose

Campaign.find {client_id:req.param('client_id')}, (error, campaigns) -> if error response = error: error.message else ... what to do. 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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1.2k views

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mongodb - Upserting in Mongo DB using official C# driver

In the official documentation of mongodb they mention upserts, so it would be really nice to write an upsert command ... upsert if there is one? See Question&Answers more detail:os...

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

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910 views

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mongodb - How to implement post tags in Mongo?

I'm toying with Mongo to make a SO-like pet project, and I want to implement post tags. Each tag has a ... , but that shouldn't matter probably. See Question&Answers more detail:os...

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

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995 views

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mongodb - How to use the dumped data by mongodump?

I have used mongodump to dump my database of mongodb, it created some bson files under dump/mydb But I don' ... import them to another mongodb? See Question&Answers more detail:os...

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

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854 views

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mongodb - Why does Mongoose have both schemas and models?

The two types of objects seem to be so close to one another that having both feels redundant. What is the ... having both schemas and models? See Question&Answers more detail:os...

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

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