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Posted to user@couchdb.apache.org by Sho Fukamachi <sh...@gmail.com> on 2009/02/18 10:45:53 UTC
Write metadata inside _attachments?
Hi Couchists,
Having in some cases multiple attachments per document, I would like
to be able to store some metadata next to each attachment - the width/
height of a picture, for example, or the bitrate of an mp3. Obviously
it would be nice if I could do it in the same place as the MIME type,
byte size, etc. However, I can't find any way to get data in there.
Is this possible / desirable / should I be doing something else?
thank you,
Sho
Re: Write metadata inside _attachments?
Posted by Sven Helmberger <sv...@gmx.de>.
Jan Lehnardt wrote:
>
> On 18 Feb 2009, at 10:45, Sho Fukamachi wrote:
>
>> Hi Couchists,
>>
>> Having in some cases multiple attachments per document, I would like
>> to be able to store some metadata next to each attachment - the
>> width/height of a picture, for example, or the bitrate of an mp3.
>> Obviously it would be nice if I could do it in the same place as the
>> MIME type, byte size, etc. However, I can't find any way to get data
>> in there.
>>
>> Is this possible / desirable / should I be doing something else?
>
> This is not currently possible but I think this sounds interesting.
> It came up with CouchApp where we want to store checksums
> with the files (although this feature is no longer needed with per-
> attachment ETags). hmm. I'm worrying a bit about the underlying
> data storage changes. This would effectively a document within
> a document and I don't know how flexible the attachment meta
> data store is.
>
> CouchApp solves this now by maintaining a mirrored sub-object
> in the main document that it syncs with the _attachments structure.
> While not really neat, it can be fully automated and put into a library.
>
> Can you open a issue on JIRA for this so we can discuss this
> on dev@?
>
> https://issues.apache.org/jira/browse/COUCHDB
>
> Cheers
> Jan
> --
There is still the problem of attachment identity that is also the root
of https://issues.apache.org/jira/browse/COUCHDB-217 .
There would be an easy solution if this was implemented you just would
have to add a "attachment_meta" object to your document that maps the
attachment revision to its metadata.
Regards,
Sven Helmberger
Re: Write metadata inside _attachments?
Posted by Sho Fukamachi <sh...@gmail.com>.
Thanks for the reply Jan. Issue created:
https://issues.apache.org/jira/browse/COUCHDB-259
Yes, I am also currently solving the problem by maintaining a separate
object as well, but feel it's a little messy and overly complex. I had
thought it wouldn't be too hard, as the content_type is being stored
there already, isn't it? I don't know enough about the internals,
though, so that could be completely wrong.
thanks again,
Sho
On 18/02/2009, at 9:00 PM, Jan Lehnardt wrote:
>
> On 18 Feb 2009, at 10:45, Sho Fukamachi wrote:
>
>> Hi Couchists,
>>
>> Having in some cases multiple attachments per document, I would
>> like to be able to store some metadata next to each attachment -
>> the width/height of a picture, for example, or the bitrate of an
>> mp3. Obviously it would be nice if I could do it in the same place
>> as the MIME type, byte size, etc. However, I can't find any way to
>> get data in there.
>>
>> Is this possible / desirable / should I be doing something else?
>
> This is not currently possible but I think this sounds interesting.
> It came up with CouchApp where we want to store checksums
> with the files (although this feature is no longer needed with per-
> attachment ETags). hmm. I'm worrying a bit about the underlying
> data storage changes. This would effectively a document within
> a document and I don't know how flexible the attachment meta
> data store is.
>
> CouchApp solves this now by maintaining a mirrored sub-object
> in the main document that it syncs with the _attachments structure.
> While not really neat, it can be fully automated and put into a
> library.
>
> Can you open a issue on JIRA for this so we can discuss this
> on dev@?
>
> https://issues.apache.org/jira/browse/COUCHDB
>
> Cheers
> Jan
> --
>
Re: Write metadata inside _attachments?
Posted by Jan Lehnardt <ja...@apache.org>.
On 18 Feb 2009, at 10:45, Sho Fukamachi wrote:
> Hi Couchists,
>
> Having in some cases multiple attachments per document, I would like
> to be able to store some metadata next to each attachment - the
> width/height of a picture, for example, or the bitrate of an mp3.
> Obviously it would be nice if I could do it in the same place as the
> MIME type, byte size, etc. However, I can't find any way to get data
> in there.
>
> Is this possible / desirable / should I be doing something else?
This is not currently possible but I think this sounds interesting.
It came up with CouchApp where we want to store checksums
with the files (although this feature is no longer needed with per-
attachment ETags). hmm. I'm worrying a bit about the underlying
data storage changes. This would effectively a document within
a document and I don't know how flexible the attachment meta
data store is.
CouchApp solves this now by maintaining a mirrored sub-object
in the main document that it syncs with the _attachments structure.
While not really neat, it can be fully automated and put into a library.
Can you open a issue on JIRA for this so we can discuss this
on dev@?
https://issues.apache.org/jira/browse/COUCHDB
Cheers
Jan
--