SystemStackError when updating fixtures

[wakairo]

In rails test, the following test code causes an error: SystemStackError: stack level too deep.

    node = nodes(:one)
    node.update(parent_id: node.id)

Node (class of the node) has closure tree as below.

class Node < ApplicationRecord
  has_closure_tree
end

It seems that the following conditions are needed to reproduce this error:

• The node object is made from fixtures.
• Updating parent_id of the node to an id of self or descendants.

I have made a repository for this issue. To reproduce this error on this repository, please execute rails test command.

Repository: https://github.com/wakairo/issue-closure_tree-error_on_update

[jkraemer]

To work around this, you could try to either put the node_hierarchies table into fixtures as well, or call Node.rebuild! after fixtures are loaded but before tests are run.