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Samvera implementation of the Portland Common Data Model (PCDM)

hydra-pcdm was a Core Component of the Samvera Community. Given a decline in available labor required for maintenance, this project no longer has a dedicated Product Owner. The documentation for what this means can be found here.

Vacant

Until a Product Owner has been identified, we ask that you please direct all requests for support, bug reports, and general questions to the #dev Channel on the Samvera Slack.

The Samvera community is here to help. Please see our support guide.

Add these lines to your application's Gemfile:

  gem 'active-fedora', '~> 9.3'
  gem 'hydra-pcdm', '~> 0.9'

And then execute:

$ bundle install

Or install it yourself:

$ gem install hydra-pcdm

We are using Web ACL as implemented in hydra-access-controls.

Reference: Portland Common Data Model

Hydra::PCDM provides three core classes:

Hydra::PCDM::Object
Hydra::PCDM::Collection
Hydra::PCDM::File

A Hydra::PCDM::File is a NonRDFSource (in LDP parlance) &emdash; a bitstream. You can use this to store content. A PCDM::File is contained by a PCDM::Object. A File may have some attached technical metadata, but no descriptive metadata. A Hydra::PCDM::Object may contain Files, may have descriptive metadata, and may declare other Objects as members (for complex object hierarchies). A Hydra::PCDM::Collection may contain other Collections or Objects but may not directly contain Files. A Collection may also have descriptive metadata.

Typically, usage involves extending the behavior provided by this gem. In your application you can write something like this:

class Book < ActiveFedora::Base
  include Hydra::PCDM::ObjectBehavior
end

class Collection < ActiveFedora::Base
  include Hydra::PCDM::CollectionBehavior
end

collection = Collection.create
book = Book.create

collection.members = [book]
# or: collection.members << book
collection.save

file = book.files.build
file.content = "The quick brown fox jumped over the lazy dog."
book.save

This software has been developed by and is brought to you by the Samvera community. Learn more at the Samvera website.