Customizing Metadata

Create the GenericFile model

the GenericFile class is typically provided by Sufia, but we want to update the model, so we define it in our app instead. Since Rails finds the class in our local application, it won't load it from Sufia.

# app/models/generic_file.rb
class GenericFile < ActiveFedora::Base
  include Sufia::GenericFile
end

Add the property

Add the property declaration into the GenericFile class:

  property :alternative, predicate: ::RDF::DC.alternative

When you're done the file should look like this:

# app/models/generic_file.rb
class GenericFile < ActiveFedora::Base
  include Sufia::GenericFile
  property :alternative, predicate: ::RDF::DC.alternative
end

Extend the presenter

We create a subclass of the presenter adding alternative to the list of terms

# app/presenters/my_generic_file_presenter.rb
class MyGenericFilePresenter < Sufia::GenericFilePresenter
  self.terms = [:resource_type, :title, :creator, :contributor, :description,
                       :tag, :rights, :publisher, :date_created, :subject, :language,
                       :identifier, :based_near, :related_url, :alternative]
end

Set the controller to use our presenter

# app/controllers/generic_files_controller.rb
class GenericFilesController < ApplicationController
  include Sufia::Controller
  include Sufia::FilesControllerBehavior
  self.presenter_class = MyGenericFilePresenter
end

Now the fields show up in the show view, but we also want them on our edit form too. Let's create an edit form that has our field

Create forms

This form will extend the presenter we already created.

# app/forms/my_file_edit_form.rb
class MyFileEditForm < MyGenericFilePresenter
  include HydraEditor::Form
  include HydraEditor::Form::Permissions
  self.required_fields = [:title, :creator, :tag, :rights]
end

Create a batch form

# app/forms/my_batch_edit_form.rb
class MyBatchEditForm < MyFileEditForm
end

Set the controller to use our form

Add the following line to app/controllers/generic_files_controller.rb

  self.edit_form_class = MyFileEditForm

The whole file should look like this:

class GenericFilesController < ApplicationController
  include Sufia::Controller
  include Sufia::FilesControllerBehavior
  self.presenter_class = MyGenericFilePresenter
  self.edit_form_class = MyFileEditForm
end

And add the following line to app/controllers/batch_controller.rb

  self. edit_form_class = MyFileEditForm

The whole file should look like this:

# app/controllers/batch_controller.rb
class BatchController < ApplicationController
  include Sufia::BatchControllerBehavior
  self.edit_form_class = MyBatchEditForm
end

Required/non-required fields

TODO

Field repeatability

TODO

Labels and help text

By default the label for the field in the form is taken from the property label, with the initial letter capitalised. Here is an example of customising it, and the associated help text:

# config/locales/sufia.en.yml
en:
  simple_form:
    labels:
      generic_file:
        alternative: "Alternative Title"
    metadata_help:
      generic_file:
        alternative: "An alternative name for a file."

TODO (I assume there is a different way of handling the label in the batch form?)