MongoDB driver ruby, remove field in document

Question

I am triying remove field in a big document, therefore I would like to do something:

collection.update({'_id' => @id},  {"$unset" => {'herField'})

But it is not possible. I don't want to rewrite entire document, any idea?

score 2 · Accepted Answer · edited Aug 30 '13 at 17:46

2

Your syntax looks slightly incorrect. As per docs:

collection.update( { _id: @id }, { $unset: { herField: true } }, { multi: true });

Need the 'multi' option if you want to update multiple documents. E.g. from all records on this collection.

edited Aug 30 '13 at 17:46

mu is too short

answered Aug 30 '13 at 16:46

mbaird

I am using https://github.com/mongodb/mongo-ruby-driver. And I'm just editing one document. – ie8888 Aug 30 '13 at 17:18
@ie8888: Does it work if you use something in the `$unset` that's truthy in the JavaScript sense? Say `{ $unset: { herField: true }`. – mu is too short Aug 30 '13 at 17:20
I am not using Javascript, I am using Ruby. When I ran my code, I get Invalid modifier specified: $unset (Mongo::OperationFailure) – ie8888 Aug 30 '13 at 17:31
@ie8888: Yes, I know that, but MongoDB thinks in terms of JavaScript. – mu is too short Aug 30 '13 at 17:32
Thanks @muistooshort I had not understood what you said.now yes. It works! – ie8888 Aug 30 '13 at 17:38

1 Answers1