Mongoose单个嵌入子文档默认值
Mongoose在版本4.2.7中创建了一个新的单子文档功能(and),允许一个嵌入的子文档模式,其行为方式与一对多子文档的行为方式相同 在父级保存时创建默认单子单据的最佳方法是什么Mongoose单个嵌入子文档默认值,mongoose,Mongoose,Mongoose在版本4.2.7中创建了一个新的单子文档功能(and),允许一个嵌入的子文档模式,其行为方式与一对多子文档的行为方式相同 在父级保存时创建默认单子单据的最佳方法是什么 var UserPermisssionsSchema = new mongoose.Schema({ siteAdmin: { type: Boolean, default: false, } }); var UserSchema = mongoose.Schema
var UserPermisssionsSchema = new mongoose.Schema({
siteAdmin: {
type: Boolean,
default: false,
}
});
var UserSchema = mongoose.Schema({
fname: String,
lname: String,
permissions: UserPermisssionsSchema
});
我希望在创建父用户文档时使用默认值创建权限
字段
这不起作用:
编辑:在4.2.7和4.4.3之间发生猫鼬更改后,此功能现在起作用
var UserSchema = mongoose.Schema({
fname: String,
lname: String,
permissions: {
type: UserPermisssionsSchema ,
default: UserPermisssionsSchema
}
});
请试试这个
var PerSchema = new mongoose.Schema({
siteAdmin: {type: Boolean, default: false}
});
var UserSchema = mongoose.Schema({
fname: String,
lname: String,
permissions: { type: PerSchema, default: () => ({}) },
});
用Mongoose v4.4.3测试它
var User = mongoose.model('User', UserSchema);
function setUser() {
var u = new User({
fname: 'asa',
lname: 'dddd'
});
u.save(function(err) {
if (err)
console.log(err);
else
console.log('save user successfully');
});
}
结果是
{
"_id" : ObjectId("56c68321a548be98198ebb71"),
"fname" : "asa",
"lname" : "dddd",
"permissions" : {
"_id" : ObjectId("56c68321a548be98198ebb70"),
"siteAdmin" : false
},
"__v" : 0
}
如果希望权限
的默认值为{}
。请按以下方式尝试
var PerSchema = mongoose.Schema({
siteAdmin: {type: Boolean}
}, {_id: false});
var UserSchema = mongoose.Schema({
fname: String,
lname: String,
permissions: { type: PerSchema, required: true, default: {} },
});
试验
结果是
{ "_id" : ObjectId("56c687427191d54021875fb1"),
"fname" : "asa",
"lname" : "dddd",
"permissions" : { },
"__v" : 0
}
Mongoose维护人员,我建议:
var UserSchema = mongoose.Schema({
fname: String,
lname: String,
permissions:
type: UserPermisssionsSchema ,
default: () => ({}),
}
});
这将使permissions
相对于userpermissionschema
可能具有的任何默认值默认为空对象。如果将default
设置为UserPermissionsSchema
,如果某个属性恰好与mongoose架构方法重叠,则可能会出现一些不良行为。mongoose single embedded sub document default
Mongoose多(数组)嵌入子文档默认值
这也行不通。错误是:键$\uuuuu不能以“$”开头
@steampowered,我测试了它并在我的答案中显示了结果,如果我遗漏了什么,请告诉我…我在出现错误时使用的是4.2.7
,但现在升级到4.4.3它可以工作了!您为什么将PerSchema
定义为新的mongoose.Schema
和UserSchema
定义为简单的mongoose.Schema
?请不要将默认值
设置为架构实例<代码>默认值:PerSchema
错误,并在最近版本的Mongoose中抛出错误。改用default:()=>({})
。
var UserSchema = mongoose.Schema({
fname: String,
lname: String,
permissions:
type: UserPermisssionsSchema ,
default: () => ({}),
}
});
var UserPermisssionsSchema = new mongoose.Schema({
siteAdmin: {
type: Boolean,
default: false,
}
});
var UserSchema = mongoose.Schema({
fname: String,
lname: String,
permissions:
type: UserPermisssionsSchema,
default: () => ({}),
})
var UserPermisssionsSchema = new mongoose.Schema({
siteAdmin: {
type: Boolean,
default: false,
}
});
var UserSchema = mongoose.Schema({
fname: String,
lname: String,
permissions:
type: [UserPermisssionsSchema],
default: () => ([]),
})