Generate list for overview group by based on current ticket attributes.

app/assets/javascripts/app/controllers/overview.coffee

@@ -4,6 +4,11 @@ class Index extends App.ControllerSubContent
   constructor: ->
     super
 
+    # update group by with current attributes
+    for attribute in App.Overview.configure_attributes
+      if attribute.name is 'group_by'
+        attribute.options = App.Overview.groupByAttributes()
+
     new App.ControllerGenericIndex(
       el: @el
       id: @id

app/assets/javascripts/app/controllers/ticket_overview.coffee

@@ -1466,13 +1466,7 @@ class App.OverviewSettings extends App.ControllerModal
       null:       true
       nulloption: true
       translate:  true
-      options:
-        customer:       'Customer'
-        organization:   'Organization'
-        state:          'State'
-        priority:       'Priority'
-        group:          'Group'
-        owner:          'Owner'
+      options:    App.Overview.groupByAttributes()
     })
 
     controller = new App.ControllerForm(

app/assets/javascripts/app/models/overview.coffee

@@ -74,3 +74,11 @@ Sie können auch individuelle Übersichten für einzelne Agenten oder agenten Gr
 
   uiUrl: ->
     "#ticket/view/#{@link}"
+
+  @groupByAttributes: ->
+    groupByAttributes = {}
+    for key, attribute of App.Ticket.attributesGet()
+      if !key.match(/(_at|_no)$/) && attribute.tag isnt 'datetime' && key isnt 'number' && key isnt 'tags'
+        key = key.replace(/_(id|ids)$/, '')
+        groupByAttributes[key] = attribute.display
+    groupByAttributes