node.js - 尝试删除 Mongoose 中的子文档会出现内部 mongoose 错误

Question

我的架构如下(简化):

var Permission = new Schema({
  _id: String,  // email address
  role: String  // "admin" or "member"
});

var Org = new Schema({
  name: {type: String, index: {unique: true, dropDups: true}, trim: true},
  permissions: [Permission]
});

示例文档如下所示:

{
  "name": "My Org",
  "permissions" : [
    {"_id" : "joe@gmail.com", "role" : "admin"},
    {"_id" : "mary@gmail.com", "role" : "member"}
  ]
}

我正在尝试使用命令org.permissions.remove(req.params.email)删除权限行之一，如下面的上下文所示:

exports.removePermissions = function(req, res) {
  var name = req.params.name;
  return Org
    .findOne({name: name})
    .select()
    .exec(function(err, org) {
      if (err) return Org.handleError(res, err);
      if (!org) return Org.handleError(res, new Error("#notfound " + name));
      org.permissions.remove(req.params.email);
      org.save(function(err, org) {
        if (err) return Org.handleError(res, err);
        else return res.send(org);
      });
    });
};

当我这样做时，我收到以下错误:

TypeError: Cannot use 'in' operator to search for '_id' in joe@gmail.com
    at EmbeddedDocument.Document._buildDoc (/../node_modules/mongoose/lib/document.js:162:27)
    at EmbeddedDocument.Document (/../node_modules/mongoose/lib/document.js:67:20)
    at EmbeddedDocument (/../node_modules/mongoose/lib/types/embedded.js:27:12)
    at new EmbeddedDocument (/../node_modules/mongoose/lib/schema/documentarray.js:26:17)
    at MongooseDocumentArray._cast (/../node_modules/mongoose/lib/types/documentarray.js:62:10)
    at Object.map (native)
    at MongooseDocumentArray.MongooseArray.remove (/../node_modules/mongoose/lib/types/array.js:360:21)
    at model.Org.methods.removePermissions (/../models/org.js:159:20)

我唯一能想到的是Mongoose不支持非ObjectID的_id字段？这很奇怪，因为我在代码中的其他地方使用了这些并且它工作正常(例如 org.permissions.id("joe@gmail.com") 工作)。

非常感谢任何建议!

Answer 1

我不确定为什么使用 remove 不起作用，但您可以使用 findOneAndUpdate 原子地执行此操作和 $pull运算符:

exports.removePermissions = function(req, res) {
  var name = req.params.name;
  return Org.findOneAndUpdate(
    {name: name}, 
    {$pull: {permissions: {_id: req.params.email}}},
    function(err, org) {
      // org contains the updated doc
      ...
    });
};