Resolves #346 by ensuring that Ephemera Projects have IIIF Manifests …

…exposing Boxes as Manifests; Ensures that Ephemera Projects have slugs generated for them; Ensures that these slugs are published using RabbitMQ when EphemeraBoxes and EphemeraFolders are updated

app/change_set_persisters/plum_change_set_persister/publish_message.rb

@@ -50,6 +50,8 @@ def initialize(change_set_persister:, change_set:, post_save_resource: nil)
 
     def run
       messenger.record_updated(post_save_resource)
+      # For cases where the resource is a FileSet, propagate for the parent resource
+      messenger.record_updated(post_save_resource.decorate.parent) if post_save_resource.is_a? FileSet
     end
 
     delegate :messenger, to: :change_set_persister

app/change_sets/ephemera_project_change_set.rb

@@ -3,8 +3,9 @@ class EphemeraProjectChangeSet < Valkyrie::ChangeSet
   validates :title, presence: true
   property :title, multiple: false
   property :member_ids, multiple: true, required: false, type: Types::Strict::Array.member(Valkyrie::Types::ID)
+  property :slug, multiple: false, required: false
 
   def primary_terms
-    [:title]
+    [:title, :slug]
   end
 end

app/controllers/ephemera_projects_controller.rb

@@ -1,5 +1,5 @@
 # frozen_string_literal: true
-class EphemeraProjectsController < ApplicationController
+class EphemeraProjectsController < BaseResourceController
   include Valhalla::ResourceController
   include TokenAuth
   self.change_set_class = DynamicChangeSet
@@ -14,6 +14,15 @@ def index
     render 'index'
   end
 
+  def manifest
+    @resource = find_resource(params[:id])
+    respond_to do |f|
+      f.json do
+        render json: ManifestBuilder.new(@resource).build
+      end
+    end
+  end
+
   private
 
     def load_ephemera_projects

app/decorators/collection_decorator.rb

@@ -8,6 +8,10 @@ def manageable_files?
     false
   end
 
+  def members
+    @members ||= query_service.find_inverse_references_by(resource: model, property: :member_of_collection_ids).to_a
+  end
+
   # Nested collections are not currently supported
   def parents
     []

app/decorators/ephemera_box_decorator.rb

@@ -16,13 +16,21 @@ def title
   end
 
   def members
-    @members ||= find_members(resource: model)
+    @members ||= query_service.find_members(resource: model).to_a
   end
 
   def folders
     @folders ||= members.select { |r| r.is_a?(EphemeraFolder) }.map(&:decorate).to_a
   end
 
+  def ephemera_projects
+    @ephemera_projects ||= query_service.find_parents(resource: model).map(&:decorate).to_a
+  end
+
+  def collection_slugs
+    @collection_slugs ||= ephemera_projects.map(&:slug)
+  end
+
   def ephemera_project
     @ephemera_box ||= query_service.find_parents(resource: model).to_a.first.try(:decorate) || NullProject.new
   end

app/decorators/ephemera_field_decorator.rb

@@ -2,6 +2,10 @@
 class EphemeraFieldDecorator < Valkyrie::ResourceDecorator
   self.display_attributes = [:rendered_name, :vocabulary]
 
+  def parents
+    @parents ||= query_service.find_parents(resource: model).to_a
+  end
+
   def projects
     @projects ||= parents.select { |r| r.is_a?(EphemeraProject) }.map(&:decorate).to_a
   end

app/decorators/ephemera_folder_decorator.rb

@@ -31,8 +31,11 @@ class EphemeraFolderDecorator < Valkyrie::ResourceDecorator
   ]
   self.iiif_manifest_attributes = display_attributes + [:title] - \
                                   imported_attributes(Schema::Common.attributes) - \
-                                  Schema::IIIF.attributes - \
-                                  [:visibility, :internal_resource, :rights_statement, :rendered_rights_statement, :thumbnail_id, :provenance]
+                                  Schema::IIIF.attributes - [:visibility, :internal_resource, :rights_statement, :rendered_rights_statement, :thumbnail_id]
+
+  def members
+    @members ||= query_service.find_members(resource: model).to_a
+  end
 
   def collections
     @collections ||= query_service.find_references_by(resource: self, property: :member_of_collection_ids).to_a.map(&:decorate)
@@ -63,11 +66,15 @@ def rendered_rights_statement
   end
 
   def ephemera_box
-    @ephemera_box ||= query_service.find_parents(resource: model).to_a.first.try(:decorate)
+    @ephemera_box ||= query_service.find_parents(resource: model).map(&:decorate).to_a.first
   end
 
   def ephemera_project
-    @ephemera_project ||= ephemera_box.ephemera_project
+    @ephemera_project ||= ephemera_box.try(:ephemera_project)
+  end
+
+  def collection_slugs
+    @collection_slugs ||= Array.wrap(ephemera_project.try(:slug))
   end
 
   def manageable_files?

app/decorators/ephemera_project_decorator.rb

@@ -2,6 +2,10 @@
 class EphemeraProjectDecorator < Valkyrie::ResourceDecorator
   self.display_attributes = [:title]
 
+  def members
+    @members ||= query_service.find_members(resource: model).to_a
+  end
+
   def boxes
     @boxes ||= members.select { |r| r.is_a?(EphemeraBox) }.map(&:decorate).to_a
   end
@@ -25,4 +29,54 @@ def manageable_structure?
   def title
     super.first
   end
+
+  # Access (or generate) the slug ID for the decorated resource
+  # @return [String] the slug value
+  def slug
+    value = super
+    generated_slug.value unless value.present?
+  end
+
+  def iiif_manifest_attributes
+    local_attributes(self.class.iiif_manifest_attributes).merge iiif_manifest_exhibit
+  end
+
+  # A local identifier (slug) generated for EphemeraProjects
+  class Slug
+    attr_reader :value
+
+    # Initialize using a prefix, seed, and optional delimiter
+    # @param prefix [String] the prefix for the slug ID
+    # @param seed [String] the value used to generate the suffix for the slug
+    # @param delimiter [String] the delimiter used between the prefix and suffix
+    def initialize(prefix:, seed:, delimiter: '-')
+      @prefix = prefix
+      @seed = seed
+      @delimiter = delimiter
+      @value = generate
+    end
+    alias to_s value
+
+    private
+
+      # Generate the slug ID value
+      # @return [String] the string value used as the slug
+      def generate
+        @prefix + @delimiter + @seed.slice(0, 4)
+      end
+  end
+
+  private
+
+    # Generate the slug value from the Valkyrie Resource ID
+    # @return [Slug] the slug for the resource
+    def generated_slug
+      @slug ||= Slug.new(prefix: 'lae', seed: model.id.to_s)
+    end
+
+    # Generate the Hash for the IIIF Manifest metadata exposing the slug as an "Exhibit" property
+    # @return [Hash] the exhibit metadata hash
+    def iiif_manifest_exhibit
+      { exhibit: slug }
+    end
 end

app/decorators/file_set_decorator.rb

@@ -6,11 +6,19 @@ def manageable_files?
     false
   end
 
+  def parents
+    query_service.find_parents(resource: model).to_a.map(&:decorate)
+  end
+
   def parent
     parents.first
   end
 
   def collections
     []
   end
+
+  def collection_slugs
+    @collection_slugs ||= parent.try(:collection_slugs)
+  end
 end

app/decorators/index_collection_decorator.rb

@@ -0,0 +1,6 @@
+# frozen_string_literal: true
+class IndexCollectionDecorator < Valkyrie::ResourceDecorator
+  def iiif_manifest_attributes
+    []
+  end
+end

app/decorators/scanned_map_decorator.rb

@@ -4,6 +4,10 @@ class ScannedMapDecorator < Valkyrie::ResourceDecorator
   self.iiif_manifest_attributes = display_attributes + [:title] - \
                                   Schema::IIIF.attributes - [:visibility, :internal_resource, :rights_statement, :rendered_rights_statement, :thumbnail_id]
 
+  def members
+    @members ||= query_service.find_members(resource: model).to_a
+  end
+
   def scanned_map_members
     @scanned_maps ||= members.select { |r| r.is_a?(ScannedMap) }.map(&:decorate).to_a
   end

app/decorators/scanned_resource_decorator.rb

@@ -6,6 +6,10 @@ class ScannedResourceDecorator < Valkyrie::ResourceDecorator
                                   Schema::IIIF.attributes - [:visibility, :internal_resource, :rights_statement, :rendered_rights_statement, :thumbnail_id]
   delegate(*Schema::Common.attributes, to: :primary_imported_metadata, prefix: :imported)
 
+  def members
+    @members ||= query_service.find_members(resource: model).to_a
+  end
+
   def volumes
     @volumes ||= members.select { |r| r.is_a?(ScannedResource) }.map(&:decorate).to_a
   end
@@ -65,6 +69,10 @@ def parents
   end
   alias collections parents
 
+  def collection_slugs
+    @collection_slugs ||= collections.map(&:slug)
+  end
+
   def display_imported_language
     (imported_language || []).map do |language|
       ControlledVocabulary.for(:language).find(language).label

app/decorators/vector_work_decorator.rb

@@ -2,6 +2,10 @@
 class VectorWorkDecorator < Valkyrie::ResourceDecorator
   self.display_attributes += Schema::Geo.attributes + [:rendered_coverage, :member_of_collections] - [:thumbnail_id, :coverage]
 
+  def members
+    @members ||= query_service.find_members(resource: model).to_a
+  end
+
   # Use case for nesting vector works
   #   - time series: e.g., nyc transit system, released every 6 months
   def vector_work_members

app/models/ephemera_project.rb

@@ -4,4 +4,9 @@ class EphemeraProject < Valhalla::Resource
   attribute :id, Valkyrie::Types::ID.optional
   attribute :member_ids, Valkyrie::Types::Array
   attribute :title, Valkyrie::Types::Set
+  attribute :slug, Valkyrie::Types::Set
+
+  def logical_structure
+    []
+  end
 end

app/models/index_collection.rb

@@ -1,3 +1,13 @@
 # frozen_string_literal: true
+# Model for exposing IIIF Manifests for all Collection resources
 class IndexCollection
+  # Decorates the object (as this is not a Valkyrie::Resource)
+  # @return [IndexCollectionDecorator] an instance of the decorator
+  def decorate
+    IndexCollectionDecorator.new(self)
+  end
+
+  def logical_structure
+    []
+  end
 end

app/services/manifest_builder.rb

@@ -19,11 +19,12 @@ def build
   # Presenter modeling the Resource subjects as root nodes
   class RootNode
     def self.for(resource)
-      if resource.is_a?(Collection)
+      case resource
+      when Collection
         CollectionNode.new(resource)
-      elsif resource.is_a?(IndexCollection)
+      when IndexCollection
         IndexCollectionNode.new(resource)
-      elsif resource.is_a?(ScannedMap)
+      when ScannedMap
         ScannedMapNode.new(resource)
       else
         new(resource)
@@ -48,7 +49,12 @@ def to_s
     end
 
     def description
-      value = resource.respond_to?(:primary_imported_metadata) ? resource.primary_imported_metadata.description : resource.description
+      value = if resource.respond_to?(:primary_imported_metadata)
+                resource.primary_imported_metadata.try(:description)
+              else
+                resource.try(:description)
+              end
+
       Array.wrap(value).first
     end
 
@@ -106,7 +112,7 @@ def helper
       # Retrieve the child members for the subject resource of the Manifest
       # @return [Resource]
       def members
-        @members ||= query_service.find_members(resource: resource).to_a
+        @members ||= decorate.members
       end
 
       ##
@@ -136,32 +142,20 @@ def file_set_presenters
       []
     end
 
-    def members
-      @members ||= query_service.find_inverse_references_by(resource: resource, property: :member_of_collection_ids).to_a
-    end
-
-    def viewing_hint
-      nil
-    end
-
     def description
       resource.description
     end
-  end
 
-  class IndexCollectionNode < RootNode
-    def file_set_presenters
-      []
+    def viewing_hint
+      'multi-part'
     end
+  end
 
+  class IndexCollectionNode < CollectionNode
     def members
       @members ||= query_service.find_all_of_model(model: Collection).to_a
     end
 
-    def viewing_hint
-      nil
-    end
-
     def manifest_url
       helper.index_manifest_url
     end
@@ -173,6 +167,10 @@ def to_s
     def description
       "All collections which are a part of Plum."
     end
+
+    def id
+      nil
+    end
   end
 
   class ScannedMapNode < RootNode
@@ -328,8 +326,11 @@ def default_url_options
     end
 
     def manifest_url(resource)
-      if resource.is_a?(Collection)
+      case resource
+      when Collection
         "#{protocol}://#{host}/collections/#{resource.id}/manifest"
+      when FileSet
+        "#{protocol}://#{host}/concern/#{resource.decorate.parent.model_name.plural}/#{resource.decorate.parent.id}/manifest"
       else
         "#{protocol}://#{host}/concern/#{resource.model_name.plural}/#{resource.id}/manifest"
       end