removing multiple fields from the same document ($unsetall?)

[Laszlo Hornyak]

Hi,

In a data processing application I would like to remove several fields fields from a document and replace it with a new field. The $unset operator works fine for a single field. e.g.

> db.t.insert({"_id" : 1, a : 1, b : 2, c : 3, d : 4});
> db.t.insert({"_id" : 3, a : 1, b : 2, c : 3, d : 4});
> db.t.update({_id : 3}, {$unset : {a : 1} });
> db.t.find();
{ "_id" : 3, "b" : 2, "c" : 3, "d" : 4 }

I gave it a try but $unset does not support arrays and you can not set multiple $unset in the update document since the second just overwrites the first in memory, so if I try that, one of the fields get deleted while the other remains in the document.
Therefore
- I have to send an update to the document for each $unset
- or I have to replace the whole document
- etc?

Which of these is recommended? Is there any plan to implement something like an $unsetall?

I could imagine it like this

> db.t.update({_id : 3}, {$unsetall : ['a','b','c'] });

Thank you,
Laszlo

[Asya Kamsky]

Why can't you do multiple field unsets in a single update?  It works fine for me:

db.t.update({_id:3}, {$unset:{a:1, b:1, c:1}})

Just like $set and other update operators.

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