DBC22-893: added transformations and check for road conditions

src/backend/apps/event/models.py

@@ -42,8 +42,13 @@ class Event(BaseModel):
     end = models.DateTimeField(null=True)
 
     def save(self, *args, **kwargs):
-        # Put buffer on LineStrings on creation only
-        if self._state.adding and self.location and self.location.geom_type == 'LineString':
-            self.polygon = self.location.buffer_with_style(0.0182, end_cap_style=2)  # ~2km buffer in degrees
+        # Put buffer on road condition LineStrings on creation only
+        if self._state.adding and self.location and self.location.geom_type == 'LineString' and self.pk.startswith('DBCRCON'):
+            self.location.transform(3857)  # Transform to 3857 before adding buffer
+            self.polygon = self.location.buffer_with_style(2000, end_cap_style=2)  # 2km buffer
+
+            # Transform back to 4326 before updating
+            self.location.transform(4326)
+            self.polygon.transform(4326)
 
         super().save(*args, **kwargs)

src/backend/apps/event/tasks.py

@@ -35,11 +35,23 @@ def build_data_diff(current_obj, new_obj_data):
                 # {'coordinates': [-122.601346, 49.143921], 'type': 'Point'}
                 if new_field_data['type'] == 'Point':
                     data_diff[field] = Point(new_field_data['coordinates'])
+                    data_diff['polygon'] = None
 
                 else:
                     ls = LineString(new_field_data['coordinates'])
                     data_diff[field] = ls
-                    data_diff['polygon'] = ls.buffer_with_style(distance=0.0182, end_cap_style=2)  # ~2km buffer in degrees
+
+                    # Add buffer to road condition linestrings
+                    if new_obj_data['id'].startswith('DBCRCON'):
+                        ls.transform(3857)  # Transform to 3857 before adding buffer
+                        data_diff['polygon'] = ls.buffer_with_style(2000, end_cap_style=2)  # Add 2km buffer
+
+                        # transform back to 4326 before updating
+                        ls.transform(4326)
+                        data_diff['polygon'].transform(4326)
+
+                    else:
+                        data_diff['polygon'] = None
 
             else:
                 data_diff[field] = new_field_data