nodeIsLeaf method

@override bool nodeIsLeaf(String nodeId)

Check if a Node has at least one Relation to it, but none from it.

Implementation

@override
bool nodeIsLeaf(String nodeId) {
  final hasIncoming = _select(
    'relations',
    where: 'toNodeId = ?',
    whereArgs: [nodeId],
  ).isNotEmpty;
  final hasOutgoing = _select(
    'relations',
    where: 'fromNodeId = ?',
    whereArgs: [nodeId],
  ).isNotEmpty;
  return hasIncoming && !hasOutgoing;
}