Before a few renames

app/models/id_card/employer_logo.rb

@@ -1,15 +1,15 @@
 module IdCard
   class EmployerLogo < ApplicationRecord
-    before_save :calculate_aspect_ratio, if: :image_data_changed?
+    before_validation :calculate_aspect_ratio, if: :image_data_changed?
 
     private
 
     def calculate_aspect_ratio
-      image_io = StringIO.new(image_data)
+      image_io = StringIO.new(self.image_data)
       width, height = FastImage.size(image_io)
       image_ratio = width.to_f / height
       if image_ratio
-        aspect_ratio = image_ratio.round(2)
+        self.aspect_ratio = image_ratio.round(2)
       end
     end
   end