🎁 Add video embed to OER Work Type

This commit manually adds video embed to oer model and form files. TODO: figure out why including the VideoEmbedBehavior and the VideoEmbedForm modules don't work for OER.

Issue:
- #911

app/forms/hyrax/oer_form.rb

@@ -16,15 +16,15 @@ class OerForm < Hyrax::Forms::WorkForm
                     newer_version_id previous_version_id alternate_version_id related_item_id keyword
                     date_created files visibility_during_embargo embargo_release_date visibility_after_embargo
                     visibility_during_lease lease_expiration_date visibility_after_lease visibility
-                    ordered_member_ids in_works_ids member_of_collection_ids admin_set_id abstract]
+                    ordered_member_ids in_works_ids member_of_collection_ids admin_set_id abstract video_embed]
     self.terms -=%i[previous_version_id newer_version_id alternate_version_id related_item_id]
     self.required_fields = %i[title creator resource_type date_created audience education_level learning_resource_type
                               discipline rights_statement]
 
     delegate :related_members_attributes=, :previous_version, :newer_version, :alternate_version, :related_item, to: :model
 
     def secondary_terms
-      super - [:rendering_ids]
+      super - [:rendering_ids] + [:video_embed]
     end
 
     def self.build_permitted_params

app/models/oer.rb

@@ -22,6 +22,15 @@ class Oer < ActiveFedora::Base
   validates :learning_resource_type, presence: { message: 'You must select a learning resource type.' }
   validates :resource_type, presence: { message: 'You must select a resource type.' }
   validates :discipline, presence: { message: 'You must select a discipline.' }
+  # rubocop:disable Style/RegexpLiteral
+  validates :video_embed,
+            format: {
+              # regex matches only youtube & vimeo urls that are formatted as embed links.
+              with: /(http:\/\/|https:\/\/)(www\.)?(player\.vimeo\.com|youtube\.com\/embed)/,
+              message: "Error: must be a valid YouTube or Vimeo Embed URL."
+            },
+            if: :video_embed?
+  # rubocop:enable Style/RegexpLiteral
 
   property :audience, predicate: ::RDF::Vocab::SCHEMA.EducationalAudience do |index|
     index.as :stored_searchable, :facetable
@@ -107,6 +116,14 @@ class Oer < ActiveFedora::Base
     index.as :stored_searchable, :facetable
   end
 
+  property :video_embed, predicate: ::RDF::URI("https://atla.com/terms/video_embed"), multiple: false do |index|
+    index.as :stored_searchable
+  end
+
+  def video_embed?
+    video_embed.present?
+  end
+
   # This must be included at the end, because it finalizes the metadata
   # schema (by adding accepts_nested_attributes)
   include ::Hyrax::BasicMetadata