feat: map parent_id to iCal's RELATED-TO (#15)

* feat: map parent_id to ical's releated-to property

* docs: update property 'Parent ID' status to done

README.md

@@ -79,7 +79,7 @@ Currently, TimeTree data can only be downloaded manually through a web browser.
 - [x] **Recurrences**
 - [ ] **Recurring UUID**
 - [x] **Alerts**
-- [ ] **Parent ID**
+- [x] **Parent ID**
 - [ ] **Link Object ID**
 - [ ] **Link Object ID String**
 - [ ] **Row Order**

timetree_exporter/event.py

@@ -24,6 +24,7 @@ def __init__(
         location_lat: str,
         location_lon: str,
         location: str,
+        parent_id: str,
     ):
         # pylint: disable=too-many-arguments
         # pylint: disable=too-many-locals
@@ -43,6 +44,7 @@ def __init__(
         self.all_day = all_day
         self.alerts = alerts
         self.recurrences = recurrences
+        self.parent_id = parent_id
 
     @classmethod
     def from_dict(cls, event_data: dict):
@@ -64,6 +66,7 @@ def from_dict(cls, event_data: dict):
             all_day=event_data.get("all_day"),
             alerts=event_data.get("alerts"),
             recurrences=event_data.get("recurrences"),
+            parent_id=event_data.get("parent_id"),
         )
 
     def __str__(self):

timetree_exporter/formatter.py

@@ -78,6 +78,11 @@ def url(self):
         """Return the URL of the event."""
         return self.time_tree_event.url if self.time_tree_event.url != "" else None
 
+    @property
+    def related_to(self):
+        """Return the parent ID of the event."""
+        return self.time_tree_event.parent_id
+
     def get_datetime(self, is_start_time):
         """Return the start or end time of the event."""
         if is_start_time:
@@ -155,6 +160,8 @@ def to_ical(self) -> Event:
             event.add("url", self.url)
         if self.description:
             event.add("description", self.description)
+        if self.related_to:
+            event.add("related-to", self.related_to)
 
         for alert in self.alerts:
             event.add_component(alert)