partial update or create question (ruby driver)

[Henry]

This has probably been answered before, but I couldn't find the
answer.

I have a collection of data I want to import into MongoDB once an
hour. Given a hash of attributes, I want to update those attributes
in an existing document if it exists, otherwise I want to create a new
document.

Using the ruby driver I can do something like this:

@products.update({'sku' => 'ABCD'}, attribute_hash)

But this only updates existing documents, and will not add new ones.

I can do:

@products.update({'sku' => 'ABCD'}, attribute_hash, :upsert => true)

The upsert option will do an 'insert' if the record does not exist,
however, it does a document replace on any existing documents.

What if I just want to update those attributes that I specify, but
leave the other attributes in the document alone?

Thanks.

Henry.

[Kyle Banker]

@products.update({'sku' => 'ABCD'}, {"$set" => {"foo" => "bar"}}, :upsert => true)

On Fri, Jul 16, 2010 at 5:21 PM, Eliot Horowitz <elioth...@gmail.com> wrote:

update( { full object } , { $set : {} } , true )

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