fix(form): speed up copying of documents

caluma/caluma_form/models.py

@@ -396,10 +396,15 @@ def set_family(self, root_doc):
 
     def copy(self, family=None, user=None):
         """Create a copy including all its answers."""
+        from caluma.caluma_form.utils import recalculate_answers_from_document
+
+        # defer calculated questions, as many unecessary recomputations will happen otherwise
+        meta = dict(self.meta)
+        meta["_defer_calculation"] = True
 
         new_document = type(self).objects.create(
             form=self.form,
-            meta=dict(self.meta),
+            meta=meta,
             source=self,
             family=family,
             created_by_user=user.username if user else None,
@@ -416,6 +421,10 @@ def copy(self, family=None, user=None):
                 document_family=family, to_document=new_document, user=user
             )
 
+        new_document.meta.pop("_defer_calculation", None)
+        new_document.save()
+        recalculate_answers_from_document(new_document)
+
         return new_document
 
     @cached_property