Javascript Mongoose模式：强制创建对象数组_Javascript_Node.js_Mongodb_Mongoose

Javascript Mongoose模式：强制创建对象数组

javascript node.js mongodb mongoose

Javascript Mongoose模式：强制创建对象数组,javascript,node.js,mongodb,mongoose,Javascript,Node.js,Mongodb,Mongoose,我的猫鼬模式如下所示： var userSchema = mongoose.Schema({ fbid : String, googleid : String, birthday : String, email : String, first_name : String, last_name : String, gender : String, age : Number, location : Str

我的猫鼬模式如下所示：

var userSchema = mongoose.Schema({

  fbid       : String,
  googleid   : String,
  birthday   : String,
  email      : String,
  first_name : String,
  last_name  : String,
  gender     : String,
  age        : Number,
  location   : String,
  paid       : { type: Boolean, default: 0 },
  lessons: [
    { 
      name    : { type: String,  default: 'foobar1'},
      sent    : { type: Boolean, default: 0 },
      read    : { type: Boolean, default: 0 },
      activity: { type: Boolean, default: 0 }
    },
    { 
      name    : { type: String,  default: 'foobar2'},
      sent    : { type: Boolean, default: 0 },
      read    : { type: Boolean, default: 0 },
      activity: { type: Boolean, default: 0 }
    },
    { 
      name    : { type: String,  default: 'foobar3'},
      sent    : { type: Boolean, default: 0 },
      read    : { type: Boolean, default: 0 },
      activity: { type: Boolean, default: 0 }
    },
    { 
      name    : { type: String,  default: 'foobar4'},
      sent    : { type: Boolean, default: 0 },
      read    : { type: Boolean, default: 0 },
      activity: { type: Boolean, default: 0 }
    },
    { 
      name    : { type: String,  default: 'foobar5'},
      sent    : { type: Boolean, default: 0 },
      read    : { type: Boolean, default: 0 },
      activity: { type: Boolean, default: 0 }
    },
    { 
      name    : { type: String,  default: 'foobar6'},
      sent    : { type: Boolean, default: 0 },
      read    : { type: Boolean, default: 0 },
      activity: { type: Boolean, default: 0 }
    },
    { 
      name    : { type: String,  default: 'foobar7'},
      sent    : { type: Boolean, default: 0 },
      read    : { type: Boolean, default: 0 },
      activity: { type: Boolean, default: 0 }
    },
    { 
      name    : { type: String,  default: 'foobar8'},
      sent    : { type: Boolean, default: 0 },
      read    : { type: Boolean, default: 0 },
      activity: { type: Boolean, default: 0 }
    } 
  ]

});

var lessonSchema = Schema({
    name: { type: String },
    sent: { type: Boolean },
    read: { type: Boolean },
    activity: { type: Boolean }
});

var userSchema = Schema({
    fbid: { type: String },
    googleid: { type: String },
    birthday: { type: String },
    email: { type: String },
    first_name: { type: String },
    last_name: { type: String },
    gender: { type: String },
    age: { type: Number },
    location: { type: String },
    paid: { type: Boolean, default: 0 },
    lessons: [lessonSchema]
});

userSchema.pre("save", function (next) {
    if (!this.lessons || this.lessons.length == 0) {
        this.lessons = [];
        this.lessons.push({
            "name": "football 1",
            "sent": true,
            "read": true,
            "activity": true
        })

         this.lessons.push({
            "name": "football 2",
            "sent": true,
            "read": true,
            "activity": true
        })

         this.lessons.push({
            "name": "football 3",
            "sent": true,
            "read": true,
            "activity": true
        })

         this.lessons.push({
            "name": "football 3",
            "sent": true,
            "read": true,
            "activity": true
        })
    }
    next();
});

执行

new User（）

时，除了

lessons

数组之外，所有内容都会正确创建，该数组返回为空数组，而不是使用默认值创建嵌套对象

在执行

新建用户（）

时，可以创建这些对象，但我希望在模型本身中发生这种情况，因为所有用户都将有相同的

课程和相同的初始值
如何实现这一点？
您可以在模式中添加预保存挂钩
schema.pre('save', function(next) {
  if (this.isNew) {
    this.set('lessons', [ ... ]);
  }
  next();
});

更多信息请参见此处
您可以在模式中添加预保存挂钩
schema.pre('save', function(next) {
  if (this.isNew) {
    this.set('lessons', [ ... ]);
  }
  next();
});

下面的链接将有助于为mongoose模式中的嵌套数组设置默认值

你可以这样做：
var userSchema = mongoose.Schema({

  fbid       : String,
  googleid   : String,
  birthday   : String,
  email      : String,
  first_name : String,
  last_name  : String,
  gender     : String,
  age        : Number,
  location   : String,
  paid       : { type: Boolean, default: 0 },
  lessons: [
    { 
      name    : { type: String,  default: 'foobar1'},
      sent    : { type: Boolean, default: 0 },
      read    : { type: Boolean, default: 0 },
      activity: { type: Boolean, default: 0 }
    },
    { 
      name    : { type: String,  default: 'foobar2'},
      sent    : { type: Boolean, default: 0 },
      read    : { type: Boolean, default: 0 },
      activity: { type: Boolean, default: 0 }
    },
    { 
      name    : { type: String,  default: 'foobar3'},
      sent    : { type: Boolean, default: 0 },
      read    : { type: Boolean, default: 0 },
      activity: { type: Boolean, default: 0 }
    },
    { 
      name    : { type: String,  default: 'foobar4'},
      sent    : { type: Boolean, default: 0 },
      read    : { type: Boolean, default: 0 },
      activity: { type: Boolean, default: 0 }
    },
    { 
      name    : { type: String,  default: 'foobar5'},
      sent    : { type: Boolean, default: 0 },
      read    : { type: Boolean, default: 0 },
      activity: { type: Boolean, default: 0 }
    },
    { 
      name    : { type: String,  default: 'foobar6'},
      sent    : { type: Boolean, default: 0 },
      read    : { type: Boolean, default: 0 },
      activity: { type: Boolean, default: 0 }
    },
    { 
      name    : { type: String,  default: 'foobar7'},
      sent    : { type: Boolean, default: 0 },
      read    : { type: Boolean, default: 0 },
      activity: { type: Boolean, default: 0 }
    },
    { 
      name    : { type: String,  default: 'foobar8'},
      sent    : { type: Boolean, default: 0 },
      read    : { type: Boolean, default: 0 },
      activity: { type: Boolean, default: 0 }
    } 
  ]

});

var lessonSchema = Schema({
    name: { type: String },
    sent: { type: Boolean },
    read: { type: Boolean },
    activity: { type: Boolean }
});

var userSchema = Schema({
    fbid: { type: String },
    googleid: { type: String },
    birthday: { type: String },
    email: { type: String },
    first_name: { type: String },
    last_name: { type: String },
    gender: { type: String },
    age: { type: Number },
    location: { type: String },
    paid: { type: Boolean, default: 0 },
    lessons: [lessonSchema]
});

userSchema.pre("save", function (next) {
    if (!this.lessons || this.lessons.length == 0) {
        this.lessons = [];
        this.lessons.push({
            "name": "football 1",
            "sent": true,
            "read": true,
            "activity": true
        })

         this.lessons.push({
            "name": "football 2",
            "sent": true,
            "read": true,
            "activity": true
        })

         this.lessons.push({
            "name": "football 3",
            "sent": true,
            "read": true,
            "activity": true
        })

         this.lessons.push({
            "name": "football 3",
            "sent": true,
            "read": true,
            "activity": true
        })
    }
    next();
});

下面的链接有助于为mongoose模式中的嵌套数组设置默认值

你可以这样做：
var userSchema = mongoose.Schema({

  fbid       : String,
  googleid   : String,
  birthday   : String,
  email      : String,
  first_name : String,
  last_name  : String,
  gender     : String,
  age        : Number,
  location   : String,
  paid       : { type: Boolean, default: 0 },
  lessons: [
    { 
      name    : { type: String,  default: 'foobar1'},
      sent    : { type: Boolean, default: 0 },
      read    : { type: Boolean, default: 0 },
      activity: { type: Boolean, default: 0 }
    },
    { 
      name    : { type: String,  default: 'foobar2'},
      sent    : { type: Boolean, default: 0 },
      read    : { type: Boolean, default: 0 },
      activity: { type: Boolean, default: 0 }
    },
    { 
      name    : { type: String,  default: 'foobar3'},
      sent    : { type: Boolean, default: 0 },
      read    : { type: Boolean, default: 0 },
      activity: { type: Boolean, default: 0 }
    },
    { 
      name    : { type: String,  default: 'foobar4'},
      sent    : { type: Boolean, default: 0 },
      read    : { type: Boolean, default: 0 },
      activity: { type: Boolean, default: 0 }
    },
    { 
      name    : { type: String,  default: 'foobar5'},
      sent    : { type: Boolean, default: 0 },
      read    : { type: Boolean, default: 0 },
      activity: { type: Boolean, default: 0 }
    },
    { 
      name    : { type: String,  default: 'foobar6'},
      sent    : { type: Boolean, default: 0 },
      read    : { type: Boolean, default: 0 },
      activity: { type: Boolean, default: 0 }
    },
    { 
      name    : { type: String,  default: 'foobar7'},
      sent    : { type: Boolean, default: 0 },
      read    : { type: Boolean, default: 0 },
      activity: { type: Boolean, default: 0 }
    },
    { 
      name    : { type: String,  default: 'foobar8'},
      sent    : { type: Boolean, default: 0 },
      read    : { type: Boolean, default: 0 },
      activity: { type: Boolean, default: 0 }
    } 
  ]

});

var lessonSchema = Schema({
    name: { type: String },
    sent: { type: Boolean },
    read: { type: Boolean },
    activity: { type: Boolean }
});

var userSchema = Schema({
    fbid: { type: String },
    googleid: { type: String },
    birthday: { type: String },
    email: { type: String },
    first_name: { type: String },
    last_name: { type: String },
    gender: { type: String },
    age: { type: Number },
    location: { type: String },
    paid: { type: Boolean, default: 0 },
    lessons: [lessonSchema]
});

userSchema.pre("save", function (next) {
    if (!this.lessons || this.lessons.length == 0) {
        this.lessons = [];
        this.lessons.push({
            "name": "football 1",
            "sent": true,
            "read": true,
            "activity": true
        })

         this.lessons.push({
            "name": "football 2",
            "sent": true,
            "read": true,
            "activity": true
        })

         this.lessons.push({
            "name": "football 3",
            "sent": true,
            "read": true,
            "activity": true
        })

         this.lessons.push({
            "name": "football 3",
            "sent": true,
            "read": true,
            "activity": true
        })
    }
    next();
});

在架构声明中设置默认值：
var defaultLessons = [
    { 
      name    : 'foobar1',
      sent    : 0 ,
      read    : 0 ,
      activity: 0 
    ,
    { 
      name    : 'foobar2',
      sent    : 0 ,
      read    : 0 ,
      activity: 0 
    ,
    { 
      name    : 'foobar3',
      sent    : 0 ,
      read    : 0 ,
      activity: 0 
    ,
    { 
      name    : 'foobar4',
      sent    : 0 ,
      read    : 0 ,
      activity: 0 
    ,
    { 
      name    : 'foobar5',
      sent    : 0 ,
      read    : 0 ,
      activity: 0 
    ,
    { 
      name    : 'foobar6',
      sent    : 0 ,
      read    : 0 ,
      activity: 0 
    ,
    { 
      name    : 'foobar7',
      sent    : 0 ,
      read    : 0 ,
      activity: 0 
    ,
    { 
      name    : 'foobar8',
      sent    : 0 ,
      read    : 0 ,
      activity: 0 
    } 
  ];

var userSchema = new mongoose.Schema({
  ...
  lessons: { type: [], default: defaultLessons}
});

另一种更具结构的方法是使用：
但是，上面提到的在Mongoose4+中不起作用，我已经试过Mongoose3.8了。请参阅。
在模式声明中设置默认值：
var defaultLessons = [
    { 
      name    : 'foobar1',
      sent    : 0 ,
      read    : 0 ,
      activity: 0 
    ,
    { 
      name    : 'foobar2',
      sent    : 0 ,
      read    : 0 ,
      activity: 0 
    ,
    { 
      name    : 'foobar3',
      sent    : 0 ,
      read    : 0 ,
      activity: 0 
    ,
    { 
      name    : 'foobar4',
      sent    : 0 ,
      read    : 0 ,
      activity: 0 
    ,
    { 
      name    : 'foobar5',
      sent    : 0 ,
      read    : 0 ,
      activity: 0 
    ,
    { 
      name    : 'foobar6',
      sent    : 0 ,
      read    : 0 ,
      activity: 0 
    ,
    { 
      name    : 'foobar7',
      sent    : 0 ,
      read    : 0 ,
      activity: 0 
    ,
    { 
      name    : 'foobar8',
      sent    : 0 ,
      read    : 0 ,
      activity: 0 
    } 
  ];

var userSchema = new mongoose.Schema({
  ...
  lessons: { type: [], default: defaultLessons}
});

另一种更具结构的方法是使用：
但是，上面提到的在Mongoose4+中不起作用，我已经试过Mongoose3.8了。请参阅。
它应该是newmongoose.Schema（…）
它应该是newmongoose.Schema（…）