创建使用猫鼬阵列架构的阵列的NodeJS

Question

我想创建一个DB模式，将数据存储如下

{ 
    name : "xyz", 
    admin : "admin", 
    expense : [ 
       jan: [{expenseObject},{expenseObject}], 
       feb: [[{expenseObject},{expenseObject}] 
       ] 
} 

消费对象

var expenseSchema = new Schema({ 
    particular : String, 
    date : {type : Date, default: Date.now}, 
    paid_by : String, 
    amount : Number 
}); 

有人可以帮助我建立了一个模式相同。

欢迎任何关于更好的Schema为同一概念的建议。

Answer 1

您可以使用Sub Docs

var parentSchema = new Schema({ 
    name: { type: String }, 
    admin: { type: String }, 
    expense: [expenseSchema] 
}); 

或者，如果你需要的expenseObjects被存储在一个单独的集合，你可以使用refs，其中费用将是另一个模型

var parentSchema = new Schema({ 
    name: { type: String }, 
    admin: { type: String }, 
    expense: [{ type: Schema.Types.ObjectId, ref: 'Expense' }], 
}); 

Answer 2

var expenseSchema = new Schema({ 
    particular : String, 
    date : {type : Date, default: Date.now}, 
    paid_by : String, 
    amount : Number 
}); 

// your schema 
var mySchema = new Schema({ 
    name : {type: String, trim: true}, 
    admin : {type: String, trim: true}, 
    expense: [expenseSchema] 
}); 

的名字

---更新：

现在这个更新expense是没有任何月份分类的expenseSchema的数组。然后，如果你想获得的所有费用在特定的月份，你可以简单地做一个像这样的聚合：

db.users.aggregate(
    [ 
    // this match is for search the user 
    { $match: { name: "<ADMIN NAME>"} }, 
    // this unwind all expenses of the user selected before 
    { $unwind: "$expense" }, 
    // this project the month number with the expense 
    { 
    $project: { 
     expense: 1, 
     month: {$month: '$expense.date'} 
    } 
    }, 
    // this search all the expenses in a particular month (of the user selected before) 
    { $match: { month: 8 } }, 
    // this is optional, it's for group the result by _id of the user 
    //(es {_id:.., expenses: [{}, {}, ...]}. Otherwise the result is a list of expense 
    { 
    $group: { 
     _id:"$month", 
     expenses: { $addToSet: "$expense"} 
    } 
    } 
]);