Change order of array elements

[Achim Domma]

Hi,

I'm developing a Rails 3 application using Mongoid. As I did not got
much feedback about my problem in the related mailinglist and
Stackoverflow, I thought I should ask here. Just to make sure that I'm
not asking something that makes no sense in Mongodb. ;-)

I have a document, which holds an array of child elements. What's the
best way to change the ordering of those elements?

cheers,
Achim

[Keith Branton]

Rewrite the document. I do this a lot in my application - that's the only way I've managed it.

or perhaps you could $set the entire array in an atomic operation? I haven't tried that but it should work.

I asked for https://jira.mongodb.org/browse/SERVER-2362 to get partial support for this. Many of my sorted arrays simply contain fks, so this simple jira covers those and would help me a lot.

I do also have many cases where I keep ordered lists of sub-documents in an array and I allow users to change the order of these. I'm not aware of any jira requesting this. If you make one, post back an I'll vote on it.

[Richard Kreuter]

As Kieth Branton described, the only approach available right now is to
replace the array portion of the document, either by rewriting the whole
document or with $set.

Regards,
Richard

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