summernote embeds

app/models/application_record.rb

@@ -3,6 +3,27 @@ class ApplicationRecord < ActiveRecord::Base
 
   # TODO put that in summernote-rails
 
+  has_many_attached :summernote_embeds
+
+  before_save :update_summernote_embeds
+
+  def update_summernote_embeds
+    attributes_using_summernote = self.class.attribute_names_using_summernote.map { |attribute_name|
+      public_send(attribute_name)
+    }.compact
+
+    self.summernote_embeds = attributes_using_summernote.map { |attribute|
+      attribute.attachables.grep(ActiveStorage::Blob).uniq
+    }.flatten if attributes_using_summernote.any?
+  end
+
+  def self.attribute_names_using_summernote
+    @@attribute_names_using_summernote ||= attribute_names.select { |attribute_name|
+      attribute_type = type_for_attribute(attribute_name)
+      attribute_type.is_a?(ActiveRecord::Type::Serialized) && attribute_type.coder == ActionText::Content
+    }
+  end
+
   # https://github.com/rails/rails/blob/b961af3345fe2f9e492ba1e5424c2ceb75ac6ead/actiontext/lib/action_text/attribute.rb#L4
   # https://github.com/rails/rails/blob/b961af3345fe2f9e492ba1e5424c2ceb75ac6ead/actiontext/lib/action_text/content.rb#L121
   def self.has_summernote(name)