Implemented Reaction Page (#5)

Co-authored-by: Tim Lorsbach <tim@lorsba.ch>
Reviewed-on: enviPath/enviPy#5

epdb/models.py

@@ -612,6 +612,19 @@ class Reaction(EnviPathModel, AliasMixin, ScenarioMixin):
         r.save()
         return r
 
+    def smirks(self):
+        return f"{'.'.join([cs.smiles for cs in self.educts.all()])}>>{'.'.join([cs.smiles for cs in self.products.all()])}"
+
+    @property
+    def as_svg(self):
+        return IndigoUtils.smirks_to_svg(self.smirks(), False, width=800, height=400)
+
+    @property
+    def related_pathways(self):
+        return Pathway.objects.filter(
+            id__in=Edge.objects.filter(edge_label=self).values('pathway_id')).order_by('name')
+
+
 
 class Pathway(EnviPathModel, AliasMixin, ScenarioMixin):
     package = models.ForeignKey('epdb.Package', verbose_name='Package', on_delete=models.CASCADE, db_index=True)