♻️ Introduce Hyku::Application.theme_view_path_roots

app/controllers/concerns/hyrax/works_controller_behavior.rb

@@ -505,8 +505,10 @@ def available_admin_sets
       def inject_show_theme_views
         if show_page_theme && show_page_theme != 'default_show'
           original_paths = view_paths
-          show_theme_view_path = Rails.root.join('app', 'views', "themes", show_page_theme.to_s)
-          prepend_view_path(show_theme_view_path)
+          Hyku::Application.theme_view_path_roots.each do |root|
+            show_theme_view_path = File.join(root, 'app', 'views', "themes", show_page_theme.to_s)
+            prepend_view_path(show_theme_view_path)
+          end
           yield
           # rubocop:disable Lint/UselessAssignment, Layout/SpaceAroundOperators, Style/RedundantParentheses
           # Do NOT change this line. This is calling the Rails view_paths=(paths) method and not a variable assignment.

app/controllers/hyrax/contact_form_controller.rb

@@ -102,8 +102,10 @@ def collections(rows: 6)
       def inject_theme_views
         if home_page_theme && home_page_theme != 'default_home'
           original_paths = view_paths
-          home_theme_view_path = Rails.root.join('app', 'views', "themes", home_page_theme.to_s)
-          prepend_view_path(home_theme_view_path)
+          Hyku::Application.theme_view_path_roots.each do |root|
+            home_theme_view_path = File.join(root, 'app', 'views', "themes", home_page_theme.to_s)
+            prepend_view_path(home_theme_view_path)
+          end
           yield
           # rubocop:disable Lint/UselessAssignment, Layout/SpaceAroundOperators, Style/RedundantParentheses
           # Do NOT change this line. This is calling the Rails view_paths=(paths) method and not a variable assignment.

app/controllers/hyrax/pages_controller.rb

@@ -101,8 +101,10 @@ def collections(rows: 6)
       def inject_theme_views
         if home_page_theme && home_page_theme != 'default_home'
           original_paths = view_paths
-          home_theme_view_path = Rails.root.join('app', 'views', "themes", home_page_theme.to_s)
-          prepend_view_path(home_theme_view_path)
+          Hyku::Application.theme_view_path_roots.each do |root|
+            home_theme_view_path = File.join(root, 'app', 'views', "themes", home_page_theme.to_s)
+            prepend_view_path(home_theme_view_path)
+          end
           yield
           # rubocop:disable Lint/UselessAssignment, Layout/SpaceAroundOperators, Style/RedundantParentheses
           # Do NOT change this method. This is an override of the view_paths= method and not a variable assignment.

config/application.rb

@@ -62,13 +62,30 @@ class Application < Rails::Application
     # IiifPrint::SplitPdfs::AdventistPagesToJpgsSplitter
     config.autoload_paths.unshift("#{Rails.root}/lib")
 
+    ##
+    #   @return [Array<String>] an array of strings in which we should be looking for theme view
+    #           candidates.
+    # @see Hyrax::WorksControllerBehavior
+    # @see Hyrax::ContactFormController
+    # @see Hyrax::PagesController
+    # @see https://api.rubyonrails.org/classes/ActionView/ViewPaths.html#method-i-prepend_view_path
+    #
+    # @see .path_for
+    # @see
+    def self.theme_view_path_roots
+      returning_value = [Rails.root.to_s]
+      returning_value.push HykuKnapsack::Engine.root.to_s if defined?(HykuKnapsack)
+      returning_value
+    end
+
     ##
     # @api public
     #
     # @param relative_path [String] lookup the relative paths first in the Knapsack then in Hyku.
     #
     # @return [String] the path to the file, favoring those found in the knapsack but falling back
     #         to those in the Rails.root.
+    # @see .theme_view_path_roots
     def self.path_for(relative_path)
       if defined?(HykuKnapsack)
         engine_path = HykuKnapsack::Engine.root.join(relative_path)