Question

当尝试更新NeDB数据库中的数据时，我得到Field names cannot begin with the $ character但是只有在第二次或第三次更新数据库后才会发生。

以下是我用来更新/插入数据的代码：

addNew: function(data) {
  var deferred = $q.defer(),
      query = {
        _id: data._id,
        title: data.title,
        year: data.year,
        genres: data.genres,
        poster: data.poster
      };

  db.update(query, { $addToSet: { episodes: data.episodes[0] } }, { upsert: true }, function(err, numReplaced, upsert) {
    if (!err) {
      var data = numReplaced + '/' + upsert;
      deferred.resolve(data);
    } else {
      deferred.reject(err);
    }
  });

  return deferred.promise;
}

data.episodes[0]看起来像这样：

{
  "number": 5,
  "season": 3,
  "title": "Kissed by Fire",
  "overview": "The Hound is judged by the gods. Jaime is judged by men. Jon proves himself. Robb is betrayed. Tyrion learns the cost of weddings.",
  "screen": "http://slurm.trakt.us/images/episodes/1395-3-5.80.jpg"
}

DB I尝试更新的数据如下所示：

{
  "_id": "tt0944947",
  "title": "Game of Thrones",
  "year": 2011,
  "genres": "Drama, Fantasy, Adventure",
  "poster": "http://slurm.trakt.us/images/posters/1395-300.jpg",
  "episodes": [
    {
      "number": 10,
      "season": 4,
      "title": "The Children",
      "overview": "Circumstances change after an unexpected arrival from north of the Wall. Daenerys must face harsh realities. Bran learns more about his destiny. Tyrion sees the truth about his situation.",
      "screen": "http://slurm.trakt.us/images/episodes/1395-4-10.80.jpg"
    }
  ]
}

Answer 1

当我尝试更新没有以$开头的字段名称的对象时，我遇到了同样的问题。我通过使用angular.copy复制要更新的对象来解决这个问题。

db.update(query, { $addToSet: { episodes: angular.copy(data.episodes[0]) } }, { upsert: true }, function(err, numReplaced, upsert) { ... });

angular.copy会创建object或array的深层副本。

其他框架和库有类似的方法（example）。

更新仅在有时有效

1 个答案: