获取mongodb中叶节点的所有层级父节点直到根

function findAncestors(collection, node) {
  var ancestors = [];
  var parent = collection.findOne({ _id: node.parentId });
  
  if (parent) {
    ancestors.push(parent);
    ancestors = ancestors.concat(findAncestors(collection, parent));
  }
  
  return ancestors;
}

var leafNode = db.collection.findOne({ isLeaf: true });
var ancestors = findAncestors(db.collection, leafNode);

var leafNode = db.collection.findOne({ isLeaf: true });

db.collection.aggregate([
  { $match: { _id: leafNode._id } },
  {
    $graphLookup: {
      from: "collection",
      startWith: "$parentId",
      connectFromField: "parentId",
      connectToField: "_id",
      as: "ancestors",
      maxDepth: 10,
      depthField: "level"
    }
  },
  { $unwind: "$ancestors" },
  { $sort: { "ancestors.level": -1 } },
  { $group: { _id: "$_id", ancestors: { $push: "$ancestors" } } }
]);