Child Object in Array Updating

[MiddleTommy]

What is the way to update a child object in an array?
Say I have posts with comments as an array in the posts collection. A
user wants to edit the comments he/she made. How do I reach into the
document and update that comment (provided the comment has unique
identifying fields natural or artificial)

Or do you find the whole post from mongodb; lookup the comment
locally; change it; then update the whole document back to the server?

[Kristina Chodorow]

Check out the $ operator: http://www.mongodb.org/display/DOCS/Updating#Updating-The%24positionaloperator

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[MiddleTommy]

Thanks thats just what I needed.