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Subject: Re: Atomic update of multiple attachments?
From: Robert Johnson <robert@rowanshire.net>
In-Reply-To: <4D507F64.7030405@databill.com>
Date: Mon, 7 Feb 2011 23:34:40 +0000
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References: <4D507F64.7030405@databill.com>
To: user@couchdb.apache.org


Create your document with attributes "eventual_attachment _count" (set =
this to the expected count) and "attachment_count_so_far" (set this to =
zero).
As you add each attachment, increment "attachment_count_so_far"=20


Create a view which only emits when "attachment_count_so_far" =3D =
"eventual_attachment _count"

Does this work for you?

Bob

On 7 Feb 2011, at 23:25, Wayne Conrad wrote:

> Is there anything I can do to achieve the illusion of atomic update of =
a set of attachments?  Here's the effect I'd like:
>=20
> For create:
> 1. Create a document.
> 2. Add attachments to it.
> 3. Only now does the document and all of its attachments become =
visible.
>=20
> For update:
> 1. Delete all of the document's attachments.
> 2. Add a new set of attachments to the document.
> 3. Only now does the new set of attachments appear to replace the old.
>=20
> I'm using Couchdb 1.0.2 and CouchRest 1.0.1.  I'm not opposed to =
cheating to achieve my goal.  Suggestions of "Did you think of doing =
this-other-thing instead?" are also welcome.