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http://opencast.jira.com/browse/MH-7415?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=26151#comment-26151
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Christoph E. Driessen commented on MH-7415:
-------------------------------------------
Tobias, since I'm new to the architecture I need to get some things clear by
trying to repeat your comment in my own words.
First, I suppose you meant "MediaPackageMetadataService" since I cannot find a
MediaPackageMetadataProvider. Am I right here or do I miss something?
Then, as MediaPackageMetadata is not part of a MediaPackage but is returned by
a service, it has to be constructed in dependency of the MediaPackage. It seems
natural that for this process the MediaPackages ingredients will be used, i.e.
the attached catalogs. But maybe there will be other means of gathering the
metadata, e.g. by querying external entities.
So we have two types of metadata, internally provided, i.e. contained in the
media package as a catalog or whatever and externally provided metadata,
returned by the MediaPackageMetadataService.
Right now the externally provided is supplied by the internal catalogs, but
this is hidden to the client.
So to build the index both types of metadata should be used. That's what you
meant by "[...] get a reference to all mediapackage metadata providers and ask
all of them [...]", right?
So besides having a addStandardDublincCoreFields(SolrUpdateableInputDocument,
...) method there should be
addMediaPackageMetadataFields(SolrUpdateableInputDocument, ...). And as no
language information is provided alongside the MediaPackageMetadata these
values are treated as language_undefined.
But filling the SolrUpdateableInputDocument directly by multiple methods may
lead to duplicate entries. Maybe it's better to use an intermediate object to
gather all information, then discard duplicates, before writing to the index.
Probably this can be handled by solr also. I'll have a look.
> Add support for multiple field values in search index
> -----------------------------------------------------
>
> Key: MH-7415
> URL: http://opencast.jira.com/browse/MH-7415
> Project: Matterhorn Project
> Issue Type: Task
> Components: Architecture & Services
> Affects Versions: 1.1
> Reporter: Tobias Wunden
> Assignee: Christoph E. Driessen
> Fix For: 1.2
>
> Attachments: 0001-made-DCMIPeriod-immutable.patch,
> bugfix_SolrUtils.patch
>
>
> Right now, only the first value of multiple possible values of dublin core
> documents make it into the search index. This needs to be fixed by adding all
> available field values, eventually by turning the respective fields either
> into indexed fields (title_en, title_de) or multivalue fields (or both).
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