added the notification email method

app/models/authentication.rb

@@ -27,9 +27,7 @@ class Authentication < ApplicationRecord
       c.access_token = access_token
       c.refresh_token = refresh_token
       c.expires_at = expires_at
-      if expires_at < 1.minute.from_now
-        refresh_from(c)
-      end
+      refresh_from(c) if expires_at < 1.minute.from_now
     end
   end
 end

app/models/form.rb

@@ -18,7 +18,7 @@ class Form < ApplicationRecord
   validates :airtable_api_key, presence: { if: :airtable? }
   validates :airtable_app_key, presence: { if: :airtable? }
   validates :airtable_table, presence: { if: :airtable? }
-
+  validates :notify_email, format: { with: /\A([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})\z/i, on: :update }
   # TODO: use counter_cache option on association
   def submissions_count
     @submissions_count ||= submissions.count
@@ -41,7 +41,11 @@ class Form < ApplicationRecord
   def google?
     backend_name == 'google_sheets'
   end
-  def google; google?; end # TODO: remove this alias
+
+  # TODO: remove this alias
+  def google
+    google?
+  end
 
   def backend
     @backend ||= SpreadsheetBackends.const_get(backend_name.camelize).new(self)