Unlimted number of Mongo Collections

help
1

I am creating a meteor app that will be intended for mobile. I was wondering if there is a limit to the number of mongo collections a meteor app could have.
I would like to make a new collection (or a few new collections) automatically for every user account that signs up through my app. If all goes well there would likely only be no more than a couple thousand users.

Is doing something like this possible to make and have the collection(s) automatically create when a user signs? If so, how would I go about doing this? I assumed i could just pass a variable (likely related to the users id number) into the collection name?
Thank you

Anything helps!

2

I believe each collection you create incurs some overhead.

Have you considered storing all over your user’s documents in the same collection, and then place a userId property on each document, so you know who owns what? Access controls can be used to further limit who can access which documents.

3

Sounds like an XY problem, why do you want to do that exactly?

4

Thank you for the quick replies. I have thought about storing everything in one collection. But also figured that might be more confusing. In addition, I figured it would take more time to search large collections.

Example of my situation: I am looking to make a messaging app where people can have 1-on-1 conversations or group conversations. i was each user in the conversations to have their own copy of everybody’s messages in their conversations. That way if a member in a conversation they are in delete’s a message, it only deletes for themselves, but other users can still see it. With that being said, i can either store all messages in one giant collection and make duplicate messages with different id numbers for each message, OR, i can have a different messages collection for each user.
I thought have a collection for each user would compile and search more quickly given my attached example…but you see how it could scale quickly.

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With that being said, what are your thoughts on this or how could I go about making a collections for every user account?

5

why not just insert a new document for each one on one conversation, and insert some data to signify that a message was deleted? Eg:

{
  _id: "1234",
  users: ["1", "2"],
  messages: [{
    text: "Hello, is anybody here?",
    user: "1",
    timestamp: ISODate
  }, {
    text: "Nope",
    user: "2",
    deleted: true,
    timestamp: ISODate
  }]
}
6

Sorry. No meteor expert here but some rough knowledge of it.
Can i insert unlimited messages into a single message variable within a single document? if so, how do i do that?

7

Create an array or a relation