better

app/models/application_record.rb

 class ApplicationRecord < ActiveRecord::Base
   self.abstract_class = true
+
+  # Remove everything below after migration, please
+
+  def self.summernote(*args)
+    @@summernote_fields = args
+  end
+
+  before_validation :summernote
+
+  def summernote
+    @@summernote_fields.each do |field|
+      self["#{field}_new"] = send(field).to_s
+                                        .gsub('<div>', '<p>')
+                                        .gsub('</div>', '</p>')
+                                        .gsub('<p><br></p>', '')
+    end
+  end
 end

app/models/communication/website/post.rb

@@ -40,6 +40,8 @@ class Communication::Website::Post < ApplicationRecord
 
   has_rich_text :text
 
+  summernote :text
+
   has_one :imported_post,
           class_name: 'Communication::Website::Imported::Post',
           dependent: :destroy
@@ -60,8 +62,6 @@ class Communication::Website::Post < ApplicationRecord
 
   before_validation :set_published_at, if: :published_changed?
 
-  before_validation :summernote
-
   scope :published, -> { where(published: true) }
   scope :ordered, -> { order(published_at: :desc, created_at: :desc) }
   scope :recent, -> { order(published_at: :desc).limit(5) }
@@ -107,8 +107,4 @@ class Communication::Website::Post < ApplicationRecord
   def inherited_blob_ids
     [best_featured_image&.blob_id]
   end
-
-  def summernote
-    self.text_new = self.text.to_s.gsub('<div>', '<p>').gsub('</div>', '</p>').gsub('<p><br></p>', '')
-  end
 end