Mongoose更新不会持续存在

Question

使用mongodb和mongoose,我无法获得$ push来向我的数组追加一个元素.在我运行之后,我检查了mongo shell并且新的追加不在那里.不确定我做错了什么:

UserModel.findOne({ firstName: "bob" }, 'pets', function(err, user) {
  UserModel.update(user, {
    $push: {
      pets: {
          name: "pear", type: "pig"  
      }
    }
  }, function(err, numAffected, raw) {
      if (err) console.log(err);
      console.log('updated ' + JSON.stringify(numAffected));
  });
});

---

Mongoose: users.ensureIndex({ username: 1 }) { unique: true, background: true }  
Mongoose: users.findOne({ firstName: 'bob' }) { fields: { pets: 1 } }  
Mongoose: users.update({ pets: [ { type: 'dog', name: 'apple' }, { type: 'cat', name: 'felix' } ], _id: ObjectId("56a53d45a428cbde3c4299f8") }) { '$push': { pets: { name: 'pear', type: 'pig' } } } {} 
updated {"ok":1,"nModified":0,"n":0}

---

> bob = db.users.find()[0]
{
    "_id" : ObjectId("56a53d45a428cbde3c4299f8"),
    "firstName" : "bob",
    "lastName" : "smith",
    "username" : "bob123",
    "pets" : [
        {
            "name" : "apple",
            "type" : "dog"
        },
        {
            "name" : "felix",
            "type" : "cat"
        }
    ],
    "__v" : 0
}
> 

更新:更改类型字段后,仍然没有成功.这次我只想推动{ $push: { pets: "sssss" } }.

UserModel.findOne({ firstName: "bob" }, 'pets', function(err, user) {
  UserModel.update(user,
    { $push: { pets: "sssss" }},
    function(err, numAffected, raw) {
      if (err) console.log(err);
      console.log('updated ' + JSON.stringify(numAffected));
  });
});

这是实际的mongodb日志:

2016-01-29T03:14:37.030+0000 I COMMAND  [conn17] command curves.$cmd command: update { update: "users", updates: [ { q: { pets: [ { petType: "pig", name: "pear" } ], _id: ObjectId('56aad0a3ef5848c231ec80ed') }, u: { $push: { pets: "sssss" } }, upsert: false, multi: false } ], ordered: true, writeConcern: { w: 1 } } ntoskip:0 keyUpdates:0 writeConflicts:0 numYields:0 reslen:55 locks:{ Global: { acquireCount: { r: 1, w: 1 } }, Database: { acquireCount: { w: 1 } }, Collection: { acquireCount: { w: 1 } } } protocol:op_query 0ms

Answer 1

真正的原因是数组type中使用的pets不正确。实际上，type是 的关键字之一mongoose，用于标记Schema Type。

如果更改type为type1以下架构

var UserSchema = new mongoose.Schema({
    // ....
    pets: [{name: String, type1: String}],
});

保存的内容pets应如下所示，并带有额外的内容_id

"pets" : [
    {
        "name" : "o3",
        "type1" : "t3",
        "_id" : ObjectId("56a5df9adea3071b0de83407")
    },

在这种情况下，我们可以执行以下操作

UserModel.findOne({ firstName: "bob" }, 'pets', function(err, user) {
  UserModel.update(user, {
    $push: {
      pets: {
          name: "pear", type1: "pig"  
      }
    }
  }, function(err, numAffected, raw) {

结果是

"pets" : [
    {
        "name" : "o3",
        "type1" : "t3",
        "_id" : ObjectId("56a5df9adea3071b0de83407")
    },
    {
        "type1" : "pig",
        "name" : "pear",
        "_id" : ObjectId("56a5dff3a648301d0db118df")
    }
],