Recent questions tagged MongoDB

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mongodb - Find documents whose array field contains at least n elements of a given array

It is basically what the title says. Input: myArray = an array of words I have an model that have field ... at least n elements of myArray 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 delete documents by query efficiently in mongo?

I have a query, which selects documents to be removed. Right now, I remove them manually, like this (using ... ) have restored my lost honour. 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 change datatype of nested field in Mongo document?

My Mongo structure as below, "topProcesses" : [ { "cpuUtilizationPercent" : "0.0", "processId" : "1", ... to float in nested Mongo documents See Question&Answers more detail:os...

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

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851 views

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mongodb aggregation framework match by nested documents

I have the following list of documents: { "_id" : "Tvq579754r", "name": "Tom", "forms": { "PreOp":{ "status": ... ":{ "status":"closed" } } } 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 - Node.js - Mongoose - Check if a collection exists

I need to insert some data using mongoose but the name of the collection is provided by the user at the ... to hear some opinions. 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 - Pull and addtoset at the same time with mongo

I have a collection which elements can be simplified to this: {tags : [1, 5, 8]} where there would be at ... , but this does not sound nice. 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 - $unwind an object in aggregation framework

In the MongoDB aggregation framework, I was hoping to use the $unwind operator on an object (ie. a JSON collection). ... , person3: 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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931 views

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mongodb - Node.js, Mongo find and return data

I'm new to node and mongo after 15 years of VB6 and MySql. I'm sure this is not what my final ... . Any help would be greatly appreciated. See Question&Answers more detail:os...

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

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857 views

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mongodb - Meteor method vs. deny/allow rules

In Meteor, when should I prefer a method over a deny rule? It seems to me that allow/deny rules should be ... from it? What would I lose? 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 - Getting a distinct aggregation of an array field across indexes

I'm trying to learn MongoDB and how it'd be useful for analytics for me. I'm simply playing around ... call always fails without even querying. 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 - Collision probability of ObjectId vs UUID in a large distributed system

Considering that an UUID rfc 4122 (16 bytes) is much larger than a MongoDB ObjectId (12 bytes), I am trying ... has a lower ID generation rate 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: unexpected mongo exit code 100

I have just installed Meteor version 0.5.9 (45fef52095) to my CentOS release 6.3 (Final) server (Linux version ... to start? 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 - getting schema attributes from Mongoose Model

I'm using Mongoose.js to create models with schemas. I have a list of models (many) and at times I'd like ... , hats, teams, shields, shoes]?? 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 - Setting up singleton connection with node.js and mongo

Previously I used mongodb with php and to query a database I was using a singleton. This way I instantiated ... example with my cat class)? See Question&Answers more detail:os...

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

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846 views

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mongodb - How to create a Mongo Docker Image with default collections and data?

I need support here to build my own mongo docker image. I have a list of scripts to create ... Parent Dockerfile Parent Dockerfile ENTRYPOINT 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 an ISODate with pyMongo

I've been trying to find a way to create an ISODate object whith pyMongo client, but without any success so far. ... ... thanks for your 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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1.1k views

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mongodb - How to deal with the timezone issue when storing dates in utc using mongod?

I have a mongodb collection where each document has some attributes and a utc timestamp. I need to pull out data ... the [client's] timezone? 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 group and push: pushing all fields

Is there an easy way to "$push" all fields of a document? For example: Say I have a Mongo collection of books: {author ... :{$push: "$.*"}, }} See Question&Answers more detail:os...

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

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967 views

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mongodb - Mocking database in node.js?

How would I mock out the database in my node.js application, which in this case uses mongodb as the backend for a blog REST ... (); }); }); )); 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 - $skip and $limit in aggregation framework

When I read the document I found the following notes: When a $sort immediately precedes a $limit in the pipeline, the ... the top n rule apply. 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

1 answer

mongodb - Failed to start mongod.service: Unit mongod.service not found

I follow all the steps mention in MongoDB installation documents for Ubuntu 16.04. Steps 1: sudo apt-key adv ... Unit mongod.service not 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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1.2k views

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mongodb schema design for blogs

How would you design the schema for a blog-like site with document-based databases (mongodb). The site has the ... "user_id", "comment_id", } See Question&Answers more detail:os...

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

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1.1k views

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mongodb - What's the fastest way to copy a collection within the same database?

I want to copy a collection within the same database and give it a different name - basically take a snapshot. ... make calls out to the shell. See Question&Answers more detail:os...

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

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952 views

1 answer

mongodb - Couldn't connect to server 127.0.0.1:27017

I'm getting the following error: alex@alex-K43U:/$ mongo MongoDB shell version: 2.2.0 connecting to: test ... still having the same 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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908 views

1 answer

mongodb - Is there a simple way to export the data from a meteor deployed app?

Is there a simple way to export the data from a meteor deployed app? So, for example, if I had deployed an ... with data from the deployed 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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911 views

1 answer

mongodb - What is the correct way to start a mongod service on linux / OS X?

I've installed mongodb and have been able to run it, work with it, do simple DB read / write type stuff. ... of the commands? Thanks very much See Question&Answers more detail:os...

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

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3.2k views

1 answer

mongodb - Image returned from REST API always displays broken

I am building a content management system for an art portfolio app, with React. The client will POST to the ... screenshots: How to fix 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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855 views

1 answer

mongodb - Using stored JavaScript functions in the Aggregation pipeline, MapReduce or runCommand

Is there a way to use a user-defined function saved as db.system.js.save(...) in pipeline or mapreduce? See Question&Answers more detail:os...

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

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