[Feature] Pathway SVG Export (#102)

Co-authored-by: Tim Lorsbach <tim@lorsba.ch>
Reviewed-on: enviPath/enviPy#102

epdb/models.py

@@ -1657,8 +1657,8 @@ class Node(EnviPathModel, AliasMixin, ScenarioMixin):
             "depth": self.depth,
             "url": self.url,
             "node_label_id": self.default_node_label.url,
-            "image": self.url + '?image=svg',
-            "imageSize": 490,  # TODO
+            "image": f"{self.url}?image=svg",
+            "image_svg": IndigoUtils.mol_to_svg(self.default_node_label.smiles, width=40, height=40),
             "name": self.default_node_label.name,
             "smiles": self.default_node_label.smiles,
             "scenarios": [{'name': s.name, 'url': s.url} for s in self.scenarios.all()],

epdb/views.py

@@ -1452,6 +1452,22 @@ def package_pathway(request, package_uuid, pathway_uuid):
 
             return response
 
+        # Pathway d3_json() relies on a lot of related objects (Nodes, Structures, Edges, Reaction, Rules, ...)
+        # we will again fetch the current pathway identified by this url, but this time together with nearly all
+        # related objects
+
+        current_pathway = Pathway.objects.prefetch_related(
+            'node_set',
+            'node_set__out_edges',
+            'node_set__default_node_label',
+            'node_set__scenarios',
+            'edge_set',
+            'edge_set__start_nodes',
+            'edge_set__end_nodes',
+            'edge_set__edge_label',
+            'edge_set__scenarios'
+        ).get(uuid=pathway_uuid)
+
         context = get_base_context(request)
         context['title'] = f'enviPath - {current_package.name} - {current_pathway.name}'