Pass timezone to backend if recurring personal-event

Also simplify & unify with recurring.

aleksis/core/frontend/components/calendar/personal_event/PersonalEventDialog.vue

@@ -255,8 +255,11 @@ export default {
         datetimeEnd: item.fullDay ? undefined : item.datetimeEnd,
         dateStart: item.fullDay ? item.dateStart : undefined,
         dateEnd: item.fullDay ? item.dateEnd : undefined,
-        recurrences: item.recurring === false ? "" : item.recurrences,
-        timezone: DateTime.local().zoneName,
+        ...(item.recurring ? {
+          // Add clients timezone only if item is recurring
+          timezone: DateTime.local().zoneName,
+          recurrences: item.recurrences,
+        } : {}),
         persons: this.checkPermission(
           "core.create_personal_event_with_invitations_rule",
         )

aleksis/core/frontend/components/calendar/personal_event/personalEvent.graphql

+fragment personalEventFields on PersonalEventType {
+  id
+  title
+  description
+  location
+
+  datetimeStart
+  datetimeEnd
+  dateStart
+  dateEnd
+  timezone
+  recurrences
+
+  persons {
+    id
+    fullName
+  }
+  groups {
+    id
+    shortName
+  }
+}
+
 mutation createPersonalEvents($input: [BatchCreatePersonalEventInput]!) {
   createPersonalEvents(input: $input) {
     items: personalEvents {
-      id
-      title
-      description
-      location
-
-      datetimeStart
-      datetimeEnd
-      dateStart
-      dateEnd
-      recurrences
-
-      persons {
-        id
-        fullName
-      }
-      groups {
-        id
-        shortName
-      }
+      ...personalEventFields 
     }
   }
 }
@@ -33,25 +38,7 @@ mutation deletePersonalEvents($ids: [ID]!) {
 mutation updatePersonalEvents($input: [BatchPatchPersonalEventInput]!) {
   updatePersonalEvents(input: $input) {
     items: personalEvents {
-      id
-      title
-      description
-      location
-
-      datetimeStart
-      datetimeEnd
-      dateStart
-      dateEnd
-      recurrences
-
-      persons {
-        id
-        fullName
-      }
-      groups {
-        id
-        shortName
-      }
+      ...personalEventFields
     }
   }
 }

aleksis/core/schema/personal_event.py

@@ -24,15 +24,14 @@ class PersonalEventType(DjangoObjectType):
             "location",
             "datetime_start",
             "datetime_end",
-            "timezone",
             "date_start",
             "date_end",
             "owner",
             "persons",
             "groups",
         )
-        convert_choices_to_enum = False
 
+    timezone = graphene.String()
     recurrences = graphene.String()
 
 
@@ -53,7 +52,8 @@ class PersonalEventBatchCreateMutation(PermissionBatchPatchMixin, BaseBatchCreat
             "persons",
             "groups",
         )
-        field_types = {"recurrences": graphene.String(), "location": graphene.String()}
+        field_types = {"timezone": graphene.String(), "recurrences": graphene.String(), "location": graphene.String()}
+        optional_fields = ("timezone", "recurrences")
 
     @classmethod
     def get_permissions(cls, root, info, input) -> Iterable[str]:  # noqa
@@ -102,7 +102,8 @@ class PersonalEventBatchPatchMutation(BaseBatchPatchMutation):
             "persons",
             "groups",
         )
-        field_types = {"recurrences": graphene.String(), "location": graphene.String()}
+        field_types = {"timezone": graphene.String(), "recurrences": graphene.String(), "location": graphene.String()}
+        optional_fields = ("timezone", "recurrences")
 
     @classmethod
     def get_permissions(cls, root, info, input, id, obj) -> Iterable[str]:  # noqa