Do arrays stored in MongoDB keep their order?

Mongodb

Mongodb Problem Overview

Simple question, do arrays keep their order when stored in MongoDB?

Mongodb Solutions

Solution 1 - Mongodb

yep MongoDB keeps the order of the array.. just like Javascript engines..

Solution 2 - Mongodb

Yes, in fact from a quick google search on the subject, it seems that it's rather difficult to re-order them: http://groups.google.com/group/mongodb-user/browse_thread/thread/1df1654889e664c1

Solution 3 - Mongodb

I realise this is an old question, but the Mongo docs do now specify that all document properties retain their order as they are inserted. This naturally extends to arrays, too.

> ## Document Field Order > > MongoDB preserves the order of the document fields following write operations except for the following cases: > > - The _id field is always the first field in the document. > - Updates that include renaming of field names may result in the reordering of fields in the document. > > Changed in version 2.6: Starting in version 2.6, MongoDB actively attempts to preserve the field order in a document. Before version 2.6, MongoDB did not actively preserve the order of the fields in a document.

Categories
Recommended Mongodb Solutions

Previous Solution:

OnLocationChanged callback is never called

AndroidGeolocationLocationmanager

Next Solution:

Where is the __builtin__ module in Python3? Why was it renamed?

Python

Attributions

All content for this solution is sourced from the original question on Stackoverflow.

The content on this page is licensed under the Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) license.

Content TypeOriginal AuthorOriginal Content on Stackoverflow
QuestionNoah McIlraithView Question on Stackoverflow
Solution 1 - MongodbdmbView Answer on Stackoverflow
Solution 2 - MongodbChris ShainView Answer on Stackoverflow
Solution 3 - MongodbTom SpencerView Answer on Stackoverflow