Add preferences to user model

app/models/user.rb

@@ -1,6 +1,8 @@
 class User < ApplicationRecord
   include EmailValidatable
 
+  serialize :preferences, Hash, default: {}
+
   # Relations
   has_many :invitations, dependent: :destroy
   has_one  :invitation, inverse_of: :invitee, foreign_key: 'invited_user_id'
@@ -133,6 +135,11 @@ class User < ApplicationRecord
     ldap.delete_attribute(dn,:service)
   end
 
+  def pref_enabled?(key)
+    value = preferences.dig(*key.split(":"))
+    [true, "true", 1, "enabled"].include?(value)
+  end
+
   def exchange_xmpp_contact_with_inviter
     return unless inviter.services_enabled.include?("ejabberd") &&
                   services_enabled.include?("ejabberd")