Now use Module#prepend for decorators

app/decorators/controllers/refinery/admin/blogposts_controller_decorator.rb

@@ -1,10 +1,8 @@
-if defined?(Refinery::Blog)
-  Refinery::Blog::Admin::PostsController.prepend(
-    Module.new do
-      def permitted_post_params
-        params[:post][:images_attributes]={} if params[:post][:images_attributes].nil?
-        super <<  [images_attributes: [:id, :caption, :image_page_id]]
-      end
-    end
-  )
-end
+module RefineryPageImagesAddRefineryBlogAdminPostsCrontrollerParams
+  def permitted_post_params
+    params[:post][:images_attributes]={} if params[:post][:images_attributes].nil?
+    super <<  [images_attributes: [:id, :caption, :image_page_id]]
+  end
+end
+
+Refinery::Blog::Admin::PostsController.prepend(RefineryPageImagesAddRefineryBlogAdminPostsCrontrollerParams) rescue NameError

app/decorators/controllers/refinery/admin/pages_controller_decorator.rb

@@ -1,10 +1,8 @@
-if defined?(Refinery::Page)
-  Refinery::Admin::PagesController.prepend(
-    Module.new do
-      def permitted_page_params
-        params[:page][:images_attributes]={} if params[:page][:images_attributes].nil?
-        super <<  [images_attributes: [:id, :caption, :image_page_id]]
-      end
-    end
-  )
-end
+module RefineryPageImagesAddRefineryAdminPagesControllerParams
+  def permitted_page_params
+    params[:page][:images_attributes]={} if params[:page][:images_attributes].nil?
+    super <<  [images_attributes: [:id, :caption, :image_page_id]]
+  end
+end
+
+Refinery::Admin::PagesController.prepend(RefineryPageImagesAddRefineryAdminPagesControllerParams) rescue NameError

app/decorators/models/refinery/page_images_page_decorator.rb

@@ -1,3 +1,20 @@
-if defined?(Refinery::Page)
-  Refinery::Page.include RefineryPageImages::AddImagesWithCaptionsConcern
-end
+require 'ostruct'
+
+module RefineryPageImagesAddImagesWithCaptions
+  def self.prepended(base)
+    base.attr_accessor :images_with_captions
+  end
+
+  def images_with_captions
+    @images_with_captions = image_pages.map do |ref|
+      OpenStruct.new(
+        {
+          image: Refinery::Image.find(ref.image_id),
+          caption: ref.caption || ''
+        }
+      )
+    end
+  end
+end
+
+Refinery::Page.prepend(RefineryPageImagesAddImagesWithCaptions) rescue NameError