[F] Add external identifier model

Author: Tim Standen

api/app/models/concerns/externally_identifiable.rb

@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+module ExternallyIdentifiable
+  extend ActiveSupport::Concern
+
+  included do
+    has_one :external_identifier_record, class_name: "ExternalIdentifier", as: :identifiable, dependent: :destroy
+  end
+
+  def external_identifier
+    external_identifier_record&.identifier || nil
+  end
+
+  def external_identifier=(new_id)
+    unless external_identifier
+      build_external_identifier_record(identifier: new_id)
+    else
+      external_identifier_record.identifier = new_id
+    end
+    external_identifier_record.save
+  end
+end

api/app/models/external_identifier.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+class ExternalIdentifier < ApplicationRecord
+  belongs_to :identifiable, polymorphic: true, optional: false
+
+  validates :identifier, presence: true, uniqueness: true
+end

api/app/models/journal.rb

@@ -25,6 +25,7 @@ class Journal < ApplicationRecord
   include WithProjectCollectionLayout
   include WithConfigurableAvatar
   include HasKeywordSearch
+  include ExternallyIdentifiable
 
   multisearch_draftable true
 

api/app/models/project.rb

@@ -28,6 +28,7 @@ class Project < ApplicationRecord
   include TimestampScopes
   include WithConfigurableAvatar
   include HasKeywordSearch
+  include ExternallyIdentifiable
 
   has_formatted_attributes :description, :subtitle, :image_credits
   has_formatted_attributes :restricted_access_body, include_wrap: false

api/app/models/project_collection.rb

@@ -12,6 +12,7 @@ class ProjectCollection < ApplicationRecord
   include TrackedCreator
   include Taggable
   include WithProjectCollectionLayout
+  include ExternallyIdentifiable
 
   # Attachments
   manifold_has_attached_file :hero, :image

api/app/models/user_group.rb

@@ -1,6 +1,7 @@
 class UserGroup < ApplicationRecord
   include Authority::Abilities
   include Filterable
+  include ExternallyIdentifiable
 
   has_many :memberships, class_name: "UserGroupMembership", inverse_of: :user_group
   has_many :entitleables, class_name: "UserGroupEntitleable", inverse_of: :user_group

api/db/migrate/20251120233556_add_external_identifiers_table.rb

@@ -0,0 +1,9 @@
+class AddExternalIdentifiersTable < ActiveRecord::Migration[7.0]
+  def change
+    create_table :external_identifiers, id: :uuid do |t|
+      t.string :identifier, null: false
+      t.references :identifiable, polymorphic: true
+      t.timestamps
+    end
+  end
+end