unregister method

void unregister(String key)

Unregisters a query from all dependency relationships.

Removes the query as both a parent and a child.

Implementation

void unregister(String key) {
  // Remove as child
  final parent = _childToParent.remove(key);
  if (parent != null) {
    _parentToChildren[parent]?.remove(key);
    if (_parentToChildren[parent]?.isEmpty ?? false) {
      _parentToChildren.remove(parent);
    }
  }

  // Remove as parent (orphan all children)
  final children = _parentToChildren.remove(key);
  if (children != null) {
    children.forEach(_childToParent.remove);
  }
}