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Questions tagged [mongo-collection]

110 questions
380
votes
25 answers

How to select a single field for all documents in a MongoDB collection?

In my MongoDB, I have a student collection with 10 records having fields name and roll. One record of this collection is: { "_id" : ObjectId("53d9feff55d6b4dd1171dd9e"), "name" : "Swati", "roll" : "80", } I want to retrieve the field…
Shipra Swati
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298
votes
25 answers

How to copy a collection from one database to another in MongoDB

Is there a simple way to do this?
EasonBlack
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59
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8 answers

Clone a collection in MongoDB

I want to clone a MongoDB collection and save it on the same server with a different name. So for example right now I have the following collections: demo1.categories, demo1.users and demo2.users. I want to have a "demo2.categories" which is…
Daryna
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17
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11 answers

mongo-connect error with mongo-connect(session)

After searching around about it, I can't find any solution or mistake in my code about this error. I've got my app.js files inside my node JS application with the mongo-connect declaration : const MongoStore = require('connect-mongo')(session) And…
Souhail Mohamed
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12
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2 answers

Can a MongoDB collection have inside it another collection?

I need to store a recursive tree structure. A linked list. So all the objects are the same. Each has a pointer to a parent object and each has an array of child objects. Can I store such a structure in Mongo. i.e. A Mongo collection of parent…
Itay Moav -Malimovka
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8
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2 answers

creating unique index in mongoDB

I am using a java program for mongo db insertion trying to create a unique index for a field. product_src is a field in my collection and I want to set it as unique index for avoiding the duplicate insertion. I am trying the following code but…
sarath
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7
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1 answer

How to merge two databases of mongoDB present in two different computers?

I am using mongoDB to store the data of a particular website. Since two of us are working, we are using our own computer for the job. Both the computer has a database website_data and a collection in that database webpages. Now for some analysis,…
Dibya Jyoti Roy
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7
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4 answers

Create Collection in MongoDB Using Java

i want to create collection in mongodb using java.The below is the code i worked with.I can connect to database.But Collection is not happening..please help me import com.mongodb.MongoClient; import com.mongodb.DB; import…
user3219005
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6
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2 answers

How to view or modify collation options set on a MongoDB collection?

How do you modify the options that we set on a collection at the time of creation? And how do we view the options already set? If we see the collation option for example, I create a collection like this: db.createCollection("words", {collation :…
Andrew Nessin
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4
votes
1 answer

MongoDB lookup Algorithmic Complexity

What is the big-o complexity of MongoDB lookup operation? Say I have n records in my MongoDB collection 'A', And n records in collection 'B', each B's document have foreign _id of A, and one specific tag eg "preOrder","directOrder", "pendingOrder"…
Fazal
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4
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1 answer

MongoDb Update in PHP

I have one collection test_posts in which there are certain records. There is field called 'is_published' which has either 1 or 0 value. Based on which I am showing the content on end user side. I can show the content but for update there is some…
Pranav
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4
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2 answers

Creating new Meteor collections on the fly

Is it possible to create new Meteor collections on-the-fly? I'd like to create foo_bar or bar_bar depending on some pathname which should be a global variable I suppose (so I can access it throughout my whole application). Something like: var prefix…
errata
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3
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0 answers

How to add a mongo id from one collection as a foreign key in another collection

In my Spring boot application, I have collection of Todos and a collection of Courses. In the view of the application, I return the collection of courses and display whatever course I need. The Todos are stored as 1 list which represents all the…
DevRight
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3
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1 answer

How to connect to remote MongoDB with mongo-connector?

How can I connect to a MongoDB cluster on Mongo Atlas using mongo-connector? I have tried to connector to my cluster with the following commands: First attempt sudo mongo-connector -m…
hbd
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3
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2 answers

Using "from" as a kwarg key in pymongo's runcommand

I am attempting to use pymongo to clone a collection from a remote mongo instance, from the documentation cloning a collection requires the cloneCollection command, { cloneCollection: "", from: "", query: { } } and to…
Yogesh Mangaj
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