Initial Zoom, fix AD Creation

epdb/models.py

@@ -2205,7 +2205,23 @@ class Pathway(EnviPathModel, AliasMixin, ScenarioMixin, AdditionalInformationMix
         depth_map[0] = list()
         processed = set()
 
-        for n in self.root_nodes:
+        data_driven_root_nodes = self.node_set.all().annotate(
+            prod_cnt=Count('edge_products'),
+            educt_cnt=Count('edge_educts')
+        ).filter(prod_cnt=0, educt_cnt__gt=0).distinct()
+
+        # Eval QuerySet
+        root_nodes_by_depth = list(self.root_nodes)
+
+        data_driven_root_nodes.update(depth=0)
+        root_nodes = [n for n in data_driven_root_nodes]
+
+        for n in root_nodes_by_depth:
+            if n not in root_nodes:
+                if len(n.edge_products.all()) == 0:
+                    root_nodes.append(n)
+
+        for n in root_nodes:
             depth_map[0].append(n)
 
         # At most depth len(nodes) is possible