Unsetting values

[Jon Keating]

Hello,

I would like to use $unset or something that gets the same result via
Mongoose. What are my options?

For details, take a look at this open question on Stack Overflow:
http://stackoverflow.com/questions/4486926/delete-a-key-from-a-mongodb-document-using-mongoose

Regards,
Jon

[Aaron Heckmann]

there isn't a way to do this at the moment.

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Aaron

[Laurie Harper]

Presumably, though, you could drop to the native driver API directly, right? If not, would something like this work as a hack until Mongoose adds support:

var id = user._id;

user.remove()

user._id = id

delete user.key

user.save()

(Note to OP: not very efficient; may not be a good idea if you use DbRef's in your Mongo DB; may interact badly with any internal caches, etc, that Mongoose maintains... So, use with caution unless/until blessed by a Mongoose dev ;-)

L.

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Laurie Harper

http://laurie.holoweb.net/

[Aaron Heckmann]

yeah you could always drop down to the driver:

User.collection.update(query, { $unset: ... }, options, cb)

[Aaron Heckmann]

On Mon, Aug 1, 2011 at 12:13 PM, Laurie Harper <lau...@holoweb.net> wrote:

var id = user._id;

user.remove()

user._id = id

delete user.key

user.save()

This won't actually work either.

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Aaron

[Laurie Harper]

Good to know; out of interest, why not?

[Aaron Heckmann]

I thought someone would ask :)

The delete operation skirts mongooses methods and thus doesn't get marked as modified. When `save` is called, nothing gets updated b/c mongoose can't "see" the change.

Lets take it even further, suppose we "tell" mongoose that we changed it too:

delete user.key;

user.markModified('key');

user.save(...)

This will only succeed in setting the key to undefined instead of deleting it. So yeah, we should add some support for this sometime.

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Aaron

[Aaron Heckmann]

BTW, all of the models schema properties are wrapped with getters and setters so we can detect the changes transparently in most cases, with the drawback of it not working for things like delete.

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Aaron

[Laurie Harper]

Thanks for the explanation, makes perfect sense. Definitely something that will need API support at some point then :)

L.

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Laurie Harper

http://laurie.holoweb.net/

[David D.]

Is there a ticket open for this? Just want to make sure this doesn't
get forgotten.

It'd be nice to be able to completely remove a field if we want to. So
far I haven't figured out how to do it. So all the fields I'm looking
to undo get '' or null. Ideally we could just get rid of the entire
key with something like $unset.

[Aaron Heckmann]

I don't think there's a ticket. Would you mind opening one?

[David D.]

Ticket opened.

https://github.com/LearnBoost/mongoose/issues/533

[David D.]

Turns out there was a ticket already open...

https://github.com/LearnBoost/mongoose/issues/519

[Aaron Heckmann]

thanks David