add duration to visit model and export

commcare_connect/opportunity/models.py

@@ -5,6 +5,7 @@
 from django.conf import settings
 from django.db import models
 from django.db.models import Count, F, Max, Q, Sum
+from django.utils.dateparse import parse_datetime
 from django.utils.functional import cached_property
 from django.utils.timezone import now
 from django.utils.translation import gettext
@@ -586,6 +587,18 @@ def __setattr__(self, name, value):
     def images(self):
         return BlobMeta.objects.filter(parent_id=self.xform_id, content_type__startswith="image/")
 
+    @property
+    def duration(self):
+        duration = None
+        start = self.form_json["metadata"].get("timeStart")
+        end = self.form_json["metatdata"].get("timeEnd")
+        if start and end:
+            try:
+                duration = parse_datetime(end) - parse_datetime(start)
+            except (TypeError, ValueError):
+                pass
+        return duration
+
 
 class OpportunityClaim(models.Model):
     opportunity_access = models.OneToOneField(OpportunityAccess, on_delete=models.CASCADE)

commcare_connect/opportunity/tables.py

@@ -62,6 +62,7 @@ class UserVisitTable(OrgContextTable):
     )
     reason = columns.Column("Rejected Reason", accessor="reason", visible=False)
     justification = columns.Column("Justification", accessor="justification", visible=False)
+    duration = columns.Column("Duration", accessor="duration", visible=False)
 
     deliver_unit = columns.Column("Unit Name", accessor="deliver_unit__name")
     entity_id = columns.Column("Entity ID", accessor="entity_id", visible=False)