Before save copy body in rich_body

app/models/concerns/mail_template_concern.rb

@@ -11,8 +11,13 @@ module MailTemplateConcern
     replace_tags(body, dossier)
   end
 
+  def update_rich_body
+    self.rich_body = self.body
+  end
+
   included do
     has_rich_text :rich_body
+    before_save :update_rich_body
   end
 
   module ClassMethods

spec/models/concern/mail_template_concern_spec.rb

@@ -113,4 +113,10 @@ describe MailTemplateConcern do
       expect(initiated_mail.body_for_dossier(dossier2)).to eq("n #{dossier2.id}")
     end
   end
+
+  describe '#update_rich_body' do
+    before { initiated_mail.update(body: "Voici le corps du mail") }
+
+    it { expect(initiated_mail.rich_body.to_plain_text).to eq(initiated_mail.body) }
+  end
 end