Handle authentication errors when appending data

This catches exceptions that can happen when an authentication is expired
or removed by the user on google's side.

app/models/form.rb

@@ -11,6 +11,14 @@ class Form < ApplicationRecord
 
   validates_presence_of :title
 
+  def deactivate!(reason = nil)
+    self.user.deactivate!(reason)
+  end
+
+  def active?
+    self.user.active?
+  end
+
   def google_spreadsheet_url
     "https://docs.google.com/spreadsheets/d/#{google_spreadsheet_id}/edit" if google_spreadsheet_id.present?
   end

app/models/user.rb

@@ -25,6 +25,15 @@ class User < ApplicationRecord
     end
   end
 
+  def deactivate!(reason = nil)
+    # currently we only use deactivate if we get an authentication exception appending data to a spreadsheet
+    authentications.last&.update(expires_at: Time.current)
+  end
+
+  def active?
+    authentications.last.present? && !authentications.last.expired?
+  end
+
   def google_authorization
     authentications.last.google_authorization
   end