Exclude tasks from groups when changing attributes.

app/models/task.rb

@@ -18,6 +18,7 @@ class Task < ActiveRecord::Base
   validates_numericality_of :duration, :required_users, :only_integer => true, :greater_than => 0
   validates_length_of :description, maximum: 250
 
+  before_save :exclude_from_periodic_task_group
   after_save :update_ordergroup_stats
 
   # Find all tasks, for which the current user should be responsible
@@ -105,5 +106,11 @@ class Task < ActiveRecord::Base
   def update_ordergroup_stats(user_ids = self.user_ids)
     Ordergroup.joins(:users).where(users: {id: user_ids}).each(&:update_stats!)
   end
+
+  def exclude_from_periodic_task_group
+    if changed? and not new_record?
+      self.periodic_task_group = nil
+    end
+  end
 end
 

app/views/tasks/_form.html.haml

@@ -26,6 +26,6 @@
   = f.input :done
   .form-actions
     = f.submit class: 'btn btn-primary'
-    - unless @task.id
+    - if @task.new_record?
       = f.submit 'Wöchentliche Aufgabe erstellen', name: 'periodic', class: 'btn'
     = link_to t('ui.or_cancel'), :back