Is there a convention to name collection in MongoDB?

Question

I would like to know if there is a convention for database collections such as:

PageVisit or page_visit.

Are there any advantages/d

Answer 1

In http://docs.mongodb.org/manual/reference/limits/, the manual states that the collection names should begin with an underscore ('_') or a letter character, and cannot:

• contain the $.
• be an empty string (e.g. "").
• contain the null character.
• begin with the system. prefix. (Reserved for internal use.)

However, if you follow the rule and create a collection with '_' as the beginning letter, such as "_TWII", you will encounter trouble when you want to drop the collection. See the test below and the way to fix it. Collection '_TWII' was created under 'people' db.

> show collections
_TWII
employees
system.indexes
> db._TWII.drop()
2015-02-19T16:34:56.738-0800 TypeError: Cannot call method 'drop' of undefined

> use admin
switched to db admin

> db.runCommand({renameCollection:"people._TWII",to:"people.TWII"})
{ "ok" : 1 }
> use people
switched to db people
> show collections
TWII
employees
system.indexes
> db.TWII.drop()
true
> show collections
employees
system.indexes
> 

A short-cut to delete _TWII collection while under 'people' db:

> db.createCollection('^TWII')
{ "ok" : 1 }
> db.getCollection('^TWII').drop()
true