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https://issues.apache.org/jira/browse/SOLR-139?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12520554
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Erik Hatcher commented on SOLR-139:
-----------------------------------
I'm experimenting with this patch with tagging. I'm modeling the fields in
this way, beyond general document metadata fields:
<username>_tags
usernames
And copyFielding *_tags into "tags".
usernames field allows seeing all users who have tagged documents.
Users are allowed to "uncollect" an object, which would remove the
<username>_tags field and remove their name from the usernames field.
Removing the <username>_tags field use case is covered with the
<username>_tags:OVERWRITE mode. But removing a username from the multiValued
and non-duplicating usernames field is not.
An example (from some conversations with Ryan):
id: 10
usernames: ryan, erik
You want to be able to remove 'ryan' but keep 'erik'.
Perhaps we need to add a 'REMOVE' mode to remove the first (all?)
matching values
/update?mode=OVERWRITE,username=REMOVE
<doc>
id=10,
usernames=ryan
</doc>
and make the output:
id: 10
usernames: erik
But what about duplicate values?
> Support updateable/modifiable documents
> ---------------------------------------
>
> Key: SOLR-139
> URL: https://issues.apache.org/jira/browse/SOLR-139
> Project: Solr
> Issue Type: Improvement
> Components: update
> Reporter: Ryan McKinley
> Assignee: Ryan McKinley
> Attachments: getStoredFields.patch, getStoredFields.patch,
> getStoredFields.patch, getStoredFields.patch, getStoredFields.patch,
> SOLR-139-IndexDocumentCommand.patch, SOLR-139-IndexDocumentCommand.patch,
> SOLR-139-IndexDocumentCommand.patch, SOLR-139-IndexDocumentCommand.patch,
> SOLR-139-IndexDocumentCommand.patch, SOLR-139-IndexDocumentCommand.patch,
> SOLR-139-IndexDocumentCommand.patch, SOLR-139-IndexDocumentCommand.patch,
> SOLR-139-IndexDocumentCommand.patch, SOLR-139-IndexDocumentCommand.patch,
> SOLR-139-IndexDocumentCommand.patch, SOLR-139-ModifyInputDocuments.patch,
> SOLR-139-ModifyInputDocuments.patch, SOLR-139-ModifyInputDocuments.patch,
> SOLR-139-ModifyInputDocuments.patch, SOLR-139-XmlUpdater.patch,
> SOLR-269+139-ModifiableDocumentUpdateProcessor.patch
>
>
> It would be nice to be able to update some fields on a document without
> having to insert the entire document.
> Given the way lucene is structured, (for now) one can only modify stored
> fields.
> While we are at it, we can support incrementing an existing value - I think
> this only makes sense for numbers.
> for background, see:
> http://www.nabble.com/loading-many-documents-by-ID-tf3145666.html#a8722293
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