Added a move_to () metho changed

datatree/datatree.py

@@ -1412,3 +1412,9 @@ def to_zarr(
 
     def plot(self):
         raise NotImplementedError
+
+    def move_to(self, new_parent: Tree | None) -> DataTree:
+        self.parent = new_parent
+        # We take advantage of the parent setter implemented above.
+        # the parent setter also calls the _set_parent() method, thus no need to repeat it here.
+        return self

datatree/treenode.py

@@ -135,6 +135,8 @@ def _detach(self, parent: Tree | None) -> None:
                     if child is not self
                 }
             )
+            # Deleting this detached node from the children dictionary of the old parent
+            parent._children[self.name] = None
             self._parent = None
             self._post_detach(parent)