Recent questions tagged MongoDB

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mongodb - Remove embedded document in a nested array of documents

My schema looks like this: "content" : [ { "_id" : ObjectId("4fc63de85b20fb72290000f8"), "assets" : [ { " ... collection by its id. Any ideas? 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 - Problems to run examples in Meteor

I'm testing Meteor examples and this is what I see when I run meteor in todos examples: Unexpected mongo ... port 28017 Someone helps? 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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963 views

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mongodb how to get max value from collections

I have a mongodb collection like: db.kids.find() //results [ {name:'tom', age:10}, {name:'alice', age:12 ... : SELECT MAX(age) FROM kids WHERE 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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988 views

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mongodb - How to aggregate by year-month-day on a different timezone

I have a MongoDB whom store the date objects in UTC. Well, I want to perform aggregation by year,month day in a ... ', this is a different day. See Question&Answers more detail:os...

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

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841 views

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mongodb - How do I start Mongo DB from Windows?

I have installed MongoDB on my Windows 7 (64 bit) machine. I have created the path data/db too but when I ... any GUI is available for 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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mongodb - How do you query for "is not null" in Mongo?

I would like to execute a following query: db.mycollection.find(HAS IMAGE URL) What should be the correct syntax? 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 - mgo - query performance seems consistently slow (500-650ms)

My data layer uses Mongo aggregation a decent amount, and on average, queries are taking 500-650ms to return. I am ... expect it to be this bad. 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 sort on a calculated condition

I have a Mongo collection of messages that looks like this: { 'recipients': [], 'unRead': [], 'content ... whether they fit a certain criteria? 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 - Hierarchical queries with Mongo using $graphLookup

I have an employee collection with half a million records. Each record will have the following details. The mongo ... filter on top of 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 - convert iso date to timestamp in mongo query

here is the query [ { "$project": { "formattedDate": { "$dateToString": { "format": "%Y-%m-%d", "date": ... date in timestamp. How to do 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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679 views

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mongodb - Meteor: difference between names for collections, variables, publications, and subscriptions?

In the Discover Meteor examples, what's the diff between "posts" and "Posts"? Why is it that when we do an ... we now using Posts in the server? 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 - exception: can't convert from BSON type EOO to Date

I am getting an issue for running the following aggregate query: db.snippets.aggregate([ { '$project': { month: ... how to get things done. 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 - How do I do a "NOT IN" query in Mongo?

This is my document: { title:"Happy thanksgiving", body: "come over for dinner", blocked:[ {user:333, name:' ... not have user 11 in "blocked"? See Question&Answers more detail:os...

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

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867 views

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mongodb - How to efficiently perform "distinct" with multiple keys?

For example, there is a collection like this: {market: 'SH', code: '000001', date: '2012-01-01 ... efficient way to implement multikey distinct? See Question&Answers more detail:os...

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

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799 views

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mongodb - How to return Mongoose results from the find method?

Everything I can find for rending a page with mongoose results says to do it like this: users.find({}, function(err, ... }); Can this be done? See Question&Answers more detail:os...

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

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984 views

1 answer

mongodb count num of distinct values per field/key

Is there a query for calculating how many distinct values a field contains in DB. f.e I have a field for ... easier way then group and count? See Question&Answers more detail:os...

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

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984 views

1 answer

mongodb - Find document with closest integer value

Let's assume I have a collection with documents with a ratio attribute that is a floating point number. {'ratio':1 ... value of abs(x-ratio)? See Question&Answers more detail:os...

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

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966 views

1 answer

mongodb - Find all documents within last n days

My daily collection has documents like: .. { "date" : ISODate("2013-01-03T00:00:00Z"), "vid" : "ED", "san ... . How do I do that? Thank you 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 use dot in field name?

How to use dot in field name ? I see error in example: db.test2.insert({ "a.a" : "b" }) can't have . in field names [a.a] 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 - How can I update multiple documents in mongoose?

I found the following script: Device.find(function(err, devices) { devices.forEach(function(device) { device.cid = ''; device ... ) { //... }); See Question&Answers more detail:os...

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

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903 views

1 answer

mongodb - Mongoose.js instance.save() callback not firing

var mongo = require('mongoose'); var connection = mongo.createConnection('mongodb://127.0.0.1/test'); ... confirmed that MongoDb is running. See Question&Answers more detail:os...

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

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962 views

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mongodb - How to remove duplicate entries from an array?

In the following example, "Algorithms in C++" is present twice. The $unset modifier can remove a particular field but ... "name" : "robert" } See Question&Answers more detail:os...

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

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748 views

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mongodb - multiple mongo update operator in a single statement?

Can i combine $pushAll and $inc in one statement ? Before combine, this works fine : db.createCollection("test"); ... the array is the 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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819 views

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mongodb - Remove multiple documents from mongo in a single query

I have a list of mongo '_id' which I want to delete. Currently I am doing this # inactive_users --> list ... query again and again. Thank you See Question&Answers more detail:os...

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

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991 views

1 answer

mongodb - Mongo, find through list of ids

I have a process that returns a list of String MongoDB ids, [512d5793abb900bf3e20d012, 512d5793abb900bf3e20d011] And I ... notation to 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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1.2k views

1 answer

mongodb - Import more than 1 json file using mongoimport

I am new to mongodb and want to know about importing a json file from one server to another. I tried the ... help me is this possible and how See Question&Answers more detail:os...

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

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2.0k views

1 answer

mongodb - Get BinData UUID from Mongo as string

I currently have some ids stored in Mongo as UUIDs (necessary for processing). They get returned like this: ... actual UUID from Mongo quickly. See Question&Answers more detail:os...

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

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