use asset pipeline for image fallbacks

Author: drusepth

app/models/concerns/has_image_uploads.rb

@@ -9,30 +9,34 @@ module HasImageUploads
     # todo: destroy from s3 on destroy
 
     def public_image_uploads
-      self.image_uploads.where(privacy: 'public').presence || ["card-headers/#{self.class.name.downcase.pluralize}.jpg"]
+      self.image_uploads.where(privacy: 'public').presence || [header_asset_for(self.class.name)]
     end
 
     def private_image_uploads
-      self.image.uploads.where(privacy: 'private').presence || ["card-headers/#{self.class.name.downcase.pluralize}.jpg"]
+      self.image.uploads.where(privacy: 'private').presence || [header_asset_for(self.class.name)]
     end
 
     def random_image_including_private(format: :medium)
       @random_image_including_private_cache ||= {}
       key = self.class.name + self.id.to_s
       return @random_image_including_private_cache[key] if @random_image_including_private_cache.key?(key)
 
-      result = image_uploads.sample.try(:src, format).presence || "card-headers/#{self.class.name.downcase.pluralize}.jpg"
+      result = image_uploads.sample.try(:src, format).presence || header_asset_for(self.class.name)
       @random_image_including_private_cache[key] = result
 
       result
     end
 
     def first_public_image(format: :medium)
-      public_image_uploads.first.try(:src, format).presence || "card-headers/#{self.class.name.downcase.pluralize}.jpg"
+      public_image_uploads.first.try(:src, format).presence || header_asset_for(self.class.name)
     end
 
     def random_public_image(format: :medium)
-      public_image_uploads.sample.try(:src, format).presence || "card-headers/#{self.class.name.downcase.pluralize}.jpg"
+      public_image_uploads.sample.try(:src, format).presence || header_asset_for(self.class.name)
+    end
+
+    def header_asset_for(class_name)
+      ActionController::Base.helpers.asset_path("card-headers/#{class_name.downcase.pluralize}.jpg")
     end
   end
 end