Hydra::Works

Code:

Docs:

Community Support:

What is hydra-works?

The Hydra::Works gem implements the PCDM Works data model using ActiveFedora-based models. In addition to the models, Hydra::Works includes associated behaviors around the broad concept of describable "works" or intellectual entities, the need for which was expressed by a variety of Samvera community use cases.

Product Owner & Maintenance

hydra-works 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.

Product Owner

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.

Help

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

Getting Started

The PCDM Works domain model includes the following high-level entities:

• Collection: a pcdm:Collection that indirectly contains zero or more Works and zero or more Collections
• Work: a pcdm:Object that holds zero or more FileSets and zero or more Works
• FileSet: a pcdm:Object that groups one or more related pcdm:Files, such as an original file (e.g., PDF document), its derivatives (e.g., a thumbnail), and extracted full-text

View a diagram of the Hydra::Works domain model.

Behaviors included in the model include:

• Characterization of original files within FileSets
• Generation of derivatives from original files
• Virus checking of original files
• Full-text extraction from original files

Dependencies

Check out the Hydra::Derivatives README for dependencies.

Additional dependencies required for specs

ClamAV

• Mac installation

  $ brew install clamav
  $ cp /usr/local/etc/clamav/freshclam.conf.sample /usr/local/etc/clamav/freshclam.conf
  $ freshclam
  

Installation

Add these lines to your application's Gemfile:

gem 'hydra-works', '~> 0.15'

And then execute:

$ bundle install

Or install it yourself:

$ gem install hydra-works

Usage

Usage involves extending the behavior provided by this gem. In your application, you can create Hydra::Works-based models like so:

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

class Book < ActiveFedora::Base
  include Hydra::Works::WorkBehavior
end

class Page < ActiveFedora::Base
  include Hydra::Works::FileSetBehavior
end

collection = Collection.create
book = Book.create
page = Page.create

collection.members << book
collection.save

book.members << page
book.save

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

Virus Detection

To turn on virus detection, install ClamAV on your system and add the clamby gem to your Gemfile

gem 'clamby'

Then include the VirusCheck module in your FileSet class:

class Page < ActiveFedora::Base
  include Hydra::Works::FileSetBehavior
  include Hydra::Works::VirusCheck
end

Access controls

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

How to contribute

If you'd like to contribute to this effort, please check out the contributing guidelines

Development

Testing with the continuous integration server

You can test Hydra::Works using the same process as our continuous integration server. To do that, run the default rake task which will download Solr and Fedora, start them, and run the tests for you.

rake

Testing manually

If you want to run the tests manually, first run solr and FCRepo. To start solr:

solr_wrapper -v -d solr/config/ -n hydra-test -p 8985

To start FCRepo, open another shell and run:

fcrepo_wrapper -v -p 8986 --no-jms

Note you won't find these ports mentioned in this codebase, as testing behavior is inherited from ActiveFedora.

Now you’re ready to run the tests. In the directory where hydra-works is installed, run:

rake works:spec

Acknowledgments

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