Automatically build hiearchy on GET retrieve

backend/metagenedb/api/catalog/views/taxonomy.py

+from rest_framework.response import Response
+
 from metagenedb.api.catalog.filters import TaxonomyFilter
 from metagenedb.apps.catalog.models import Taxonomy
 from metagenedb.apps.catalog.serializers import TaxonomySerializer
@@ -10,3 +12,9 @@ class TaxonomyViewSet(BulkViewSet):
     serializer_class = TaxonomySerializer
     lookup_field = 'tax_id'
     filterset_class = TaxonomyFilter
+
+    def retrieve(self, request, *args, **kwargs):
+        instance = self.get_object()
+        instance.build_parental_hierarchy()
+        serializer = self.get_serializer(instance)
+        return Response(serializer.data)

backend/metagenedb/apps/catalog/models/taxonomy.py

@@ -100,9 +100,11 @@ class Taxonomy(models.Model):
     def build_parental_hierarchy(self):
         hierarchy = {}
         if self.name != 'root' and self.parent is not None:
-            hierarchy[self.rank] = self.tax_id
+            hierarchy[self.rank] = self
             hierarchy = {**hierarchy, **self.parent.build_parental_hierarchy()}
-        hierarchy['tax_id'] = self.tax_id
+        for level, value in hierarchy.items():
+            setattr(self, level, value)
+        self.save()
         return hierarchy
 
     class Meta: