What is hydra-pcdm?
Samvera implementation of the Portland Common Data Model (PCDM)
Product Owner & Maintenance
hydra-pcdm is a Core Component of the Samvera community. The documentation for what this means can be found here.
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
Portland Common Data Model
Reference: Portland Common Data Model
Hydra::PCDM provides three core classes:
:::: :::: ::::
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
Objects but may not directly contain
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 :::: end class Collection < ActiveFedora::Base include :::: 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.