Recent questions tagged MongoDB

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mongodb - Batch insert/update using Mongoid?

I googled and all others, but I didn't find the answer. The question is: Hi, how can I do batch insert with Mongoid to 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 - Dealing with schema changes in Mongoose

What's the best practice (or tool) for updating/migrating Mongoose schemas as the application evolves? 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 move documents from one collection to another collection

How can documents be moved from one collection to another collection in MongoDB?? For example: I have lot of ... be used to move 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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mongodb - Is GridFS fast and reliable enough for production?

I develop a new website and I want to use GridFS as storage for all user uploads, because it offers a lot of ... use it for a new project? 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 - Unable to create/open lock file: /data/mongod.lock errno:13 Permission denied

How to I get mongo to use a mounted drive on ec2? I really do not understand. I attached a volume on ec2 ... 16:59:15 dbexit: really exiting now 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 - Combining $regex and $or operators in Mongo

I want to use $or and $regex operators same time. db.users.insert([{name: "Alice"}, {name: "Bob"}, {name: ... /.../ (real regular expressions). 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 - Using $slice operator to get last element of array

How to get the last element of an array based on a condition in mongodb? I am unable to use slice. Here is ... records above, it should be 3. 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 get distinct records

I am using mongoDB in which I have collection of following format. {"id" : 1 , name : x ttm : 23 , val : ... per id. Is it possible in 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 - Mongo how to $lookup with DBRef

I have a trouble(/(ㄒoㄒ)/~~). Suppose that collection A is { "_id" : ObjectId("582abcd85d2dfa67f44127e1"), " ... work. Anybody can help? 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 - $unwind empty array

I have a collection of users where each document has following structure: { "_id": "<id>", "login": " ... for exclusion Thank you 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 - Best practice to maintain a mgo session

I'm currently using a mongodb with mgo lib for a web application, but I'm not sure if the way I'm using it, ... or this one is fine ..? 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 - Mongo order by length of array

Lets say I have mongo documents like this: Question 1 { answers:[ {content: 'answer1'}, {content: '2nd answer'} ... is native way to 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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mongodb - mongo group query how to keep fields

Everybody. In mongo group query, the result shows only the key(s) in arguments. How to keep the first document in each ... ", "count" : 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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mongodb - multiple instances of Mongo DB on same server

I am working with Mongo DB and I am a newbie to it. I am about to install it on a server specifically for ... with Mongo DB and if so, 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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mongodb - How do I search for an object by its ObjectId in the mongo console?

I've found this question answered for C# and Perl, but not in the native interface. I thought this would work: ... It seems pretty normal to me. 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 - Mongoimport of JSON file

I have a JSON file consisting of about 2000 records. Each record which will correspond to a document in ... Can someone recommend a solution? 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 - Matching ObjectId to String for $graphLookup

I'm trying to run a $graphLookup like demonstrated in print bellow: The objective is to, given a specific record ... Docker) 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 - Unhandled promise rejection: Error: URL malformed, cannot be parsed

I am new to aws and mongodb at the same time, so I'm stuck at a very basic point in trying to connect to my ... parsed I'm using mongodb 3.6.5. 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 - Working with special characters in a Mongo collection

I have a collection I'm unable to drop, I'm assuming that the "-" in its name is a special character. In ... ) and a slash, but nothing works. 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 complex sorting?

I know how to sort queries in MongoDB by multiple fields, e.g., db.coll.find().sort({a:1,b:-1}). Can I sort ... between a and b (a-b)? 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 do I query for distinct values in Mongoose?

I have a problem where I want to be able to get all the unique cities for a collection, and my code ... collections return if at all 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 - Using map/reduce for mapping the properties in a collection

Update: follow-up to MongoDB Get names of all keys in collection. As pointed out by Kristina, one can use Mongodb 's ... ","hello","type"] Thank you in advance! Question&Answers:os...

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

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mongodb - Include all existing fields and add new fields to document

I would like to define a $project aggregation stage where I can instruct it to add a new field and include ... to avoid having to list every field separately? Question&Answers:os...

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

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mongodb - return query based on date

I have a data like this in mongodb { "latitude" : "", "longitude" : "", "course" : "", "battery" : " ... it returns the above data result to me from the db? Question&Answers:os...

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

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mongodb - Build a reactive publication with additional fields in each document

I want to make a publication with several additional fields, but I don't want to either use Collection.aggregate and lose ... me if this is the right way to go? Question&Answers:os...

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

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1.6k views

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mongodb - Average Aggregation Queries in Meteor

Ok, still in my toy app, I want to find out the average mileage on a group of car owners' odometers. ... just overlooked something. What would that be? Thanks! Question&Answers:os...

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

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mongodb - mongo - couldn't connect to server 127.0.0.1:27017

I am coming from riak and redis where I never had an issue with this services starting, or to interact. This is a ... ] end connection 10.29.16.208:5321 (1 conn Question&Answers:os...

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

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2.1k views

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mongodb - How do you use Mongoose without defining a schema?

In previous versions of Mongoose (for node.js) there was an option to use it without defining a schema var ... way to use schema-less models in mongoose? Question&Answers:os...

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

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