add a reload method

arches_orm/arches_django/wrapper.py

@@ -219,6 +219,35 @@ def from_resource_instance(cls, resourceinstance, cross_record=None):
  resource = Resource(resourceinstance.resourceinstanceid)
  return cls.from_resource(resource, cross_record=cross_record)
 
+ def reload(self, ignore_prefetch=True):
+ """Reload field values, but not node values for class."""
+ if not self.id:
+ raise RuntimeError("Cannot reload without a database ID")
+
+ resource = (
+ self._related_prefetch(self.id)
+ if not ignore_prefetch and self._related_prefetch is not None
+ else Resource.objects.get(pk=self.id)
+ )
+ if not resource:
+ raise RuntimeError(f"Could not retrieve resource with ID {self.id}")
+
+ if str(resource.graph_id) != self.graphid:
+ raise RuntimeError(
+ f"Using find against wrong resource type: {resource.graph_id} for"
+ f" {self.graphid}"
+ )
+ node_objs = self._node_objects()
+ self._values = {}
+ values = self.values_from_resource(
+ node_objs,
+ resource,
+ related_prefetch=self._related_prefetch,
+ wkri=self,
+ )
+ self._values.update(values)
+ return self
+
  @classmethod
  def from_resource(cls, resource, cross_record=None, related_prefetch=None):
  """Build a well-known resource from an Arches resource."""