Add contains files to Hydra::PCDM::Interfaces::Object about hydra-pcdm HOT 9 CLOSED

I don't know if has_and_belongs_to_many implements LDP direct containment.

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Is this a repetition of #23?

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@flyingzumwalt it's tangentally related, but probably pertains more to what @elrayle is doing with the finishing the modeling.

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Do we need to have more than?

        contains "content", class_name: 'FileContentDatastream'
        contains "thumbnail"

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@jcoyne if that does the /files direct container URI to do the containment, then no.

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Hmmm, yeah, it also doesn't set hasFile, just ldp:contains.

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@jcoyne right. can we do something like aggregates :files ? But that creates in indirect container. The examples I'm seeing have /files as a direct container.

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My first instinct is to say, avoid aggregates since the model discussions I've been in have not treated files as an aggregation. Issues and questions...

• Is contains a concept that is already solidly in Fedora? Is there a method that gets called to add files to the contains relationship? (similar to aggregates for hasMembers)
• Do we ever want order to the list of files? NOTE: order will be tricky because GenericFiles which contains Files already has an ordered aggregation. Since the PCDM::Object can have only one aggregation with a head (IANA.first), we can't have two separate ordered aggregations for the same subject (the PCDM::Object).

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@elrayle contains translates to a ldp basic container. For files, we need the hasFile predicate, and therefore a ldp direct container. I don't believe the PCDM model allows for ordering at the hasFile level, so we should be safe there.

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