Update discharge summary to reflect age and year of birth (#2053)

* Update discharge summary to reflect age and year of birth

fixes #2052

* suggestions from codereview

care/facility/models/patient.py

@@ -1,5 +1,6 @@
 import enum
 
+from dateutil.relativedelta import relativedelta
 from django.contrib.postgres.aggregates import ArrayAgg
 from django.core.validators import MaxValueValidator, MinValueValidator
 from django.db import models
@@ -470,6 +471,11 @@ def save(self, *args, **kwargs) -> None:
         self._alias_recovery_to_recovered()
         super().save(*args, **kwargs)
 
+    def get_age(self) -> int:
+        start = self.date_of_birth or timezone.datetime(self.year_of_birth, 1, 1).date()
+        end = (self.death_datetime or timezone.now()).date()
+        return relativedelta(end, start).years
+
     def annotate_diagnosis_ids(*args, **kwargs):
         return ArrayAgg(
             "last_consultation__diagnoses__diagnosis_id",

care/templates/reports/patient_discharge_summary_pdf.html

@@ -46,11 +46,17 @@ <h3 class="text-lg text-gray-900">
         <span class="text-sm text-gray-500">Gender:</span> {{patient.get_gender_display}}
       </p>
       <p>
-        <span class="text-sm text-gray-500">Age:</span> {{patient.age}}
-      </p>
-      <p>
-        <span class="text-sm text-gray-500">Date of Birth:</span> {{patient.date_of_birth}}
+        <span class="text-sm text-gray-500">Age:</span> {{patient.get_age}}
       </p>
+      {% if patient.date_of_birth %}
+        <p>
+          <span class="text-sm text-gray-500">Date of Birth:</span> {{patient.date_of_birth}}
+        </p>
+      {% else %}
+        <p>
+          <span class="text-sm text-gray-500">Year of Birth:</span> {{patient.year_of_birth}}
+        </p>
+      {% endif %}
       <p>
         <span class="text-sm text-gray-500">Blood Group:</span> {{patient.blood_group}}
       </p>