mongoose中通过new Model()得到的对象的存储的疑问
在通过Model的构造函数得到的对象执行save方法时，mongoose是否会自动对数组中的对象添加_id字段？如果是这样，为什么会这样？
team Model的Schema
const teamSchema = new Schema({
owner:{
id:Schema.Types.ObjectId,
name:String,
},
leader:[
{
id:Schema.Types.ObjectId,
name:String,
taskCode:[
{
type:String,
}
],
}
],
teammate:[
{
id:Schema.Types.ObjectId,
name:String,
taskCode:[
{
type:String,
}
],
}
],
...
})
然后在执行
let teammate = [ { id: 59e8b4cf464f301bdc4379a4, name: 'useruser1' },
{ id: 59e8b4cf464f301bdc4379a5, name: 'useruser2' },
{ id: 59e8b4cf464f301bdc4379a6, name: 'useruser3' },
{ id: 59e8b4cf464f301bdc4379a7, name: 'useruser4' } ]
const newTeam = new Team({teamName,owner,leader,teammate,teamPlace,teamClass})
newTeam.save()
log(newTeam)
之后,log的结果是
{
...
teammate:
[ { id: 59e8b4cf464f301bdc4379a4,
name: 'useruser1',
_id: 59e8b4d0464f301bdc4379ac,
taskCode: [] },
{ id: 59e8b4cf464f301bdc4379a5,
name: 'useruser2',
_id: 59e8b4d0464f301bdc4379ab,
taskCode: [] },
{ id: 59e8b4cf464f301bdc4379a6,
name: 'useruser3',
_id: 59e8b4d0464f301bdc4379aa,
taskCode: [] },
{ id: 59e8b4cf464f301bdc4379a7,
name: 'useruser4',
_id: 59e8b4d0464f301bdc4379a9,
taskCode: [] } ],
...
实在想不明白，为什么teammate数组里面的对象会多出一个_id字段出来，求助各位大佬
5 回复
首先你自定义的id有问题应该用
let teammate = [ { id: new mongoose.Types.ObjectId, name: 'useruser1' },
看文档 http://mongoosejs.com/docs/guide.html#_id
const teammateSchema = new Schema({
name:String,
},{_id:false});
const teamSchema = new Schema({
teammate:[teammateSchema]
});
by the way:
参数：versionKey:String|Boolean
默认存储的数据里面带有有__v:0,用于版本控制，是否修复过该数据：
var schema = new Schema({ name: String });
var Thing = mongoose.model('Thing', schema);
var thing = new Thing({ name: 'mongoose v3' });
thing.save(); // { __v: 0, name: 'mongoose v3' }
// customized versionKey
new Schema({name:String}, { versionKey: '_somethingElse' })
var Thing = mongoose.model('Thing', schema);
var thing = new Thing({ name: 'mongoose v3' });
thing.save(); // { _somethingElse: 0, name: 'mongoose v3' }
当然你可以可以取消掉这个字段：
new Schema({name:String}, { versionKey: false });
var Thing = mongoose.model('Thing', schema);
var thing = new Thing({ name: 'no versioning please' });
thing.save(); // { name: 'no versioning please' }