Question

我有一个Invoice模型，它使用虚拟属性计算税，小计，总数等值。我遇到的问题是某些虚拟属性需要能够引用其他虚拟属性。

例如，以下是Invoice的Mongoose模式：

var InvoiceSchema = Schema({
    number: String,
    customer: {ref:String, email:String},
    invoiceDate: {type: Date, default: Date.now},
    dueDate: {type: Date, default: Date.now},
    memo: String,
    message: String,
    taxRate: {type:Number, default:0},
    discount: {
        value: {type:Number, default:0}, 
        percent: {type:Number, default:0}
    },
    items: [ItemSchema],
    payment: {type: Schema.Types.ObjectId, ref: 'Payment'}
});

InvoiceSchema.virtual('tax').get(function(){
    var tax = 0;

    for (var ndx=0; ndx<this.items.length; ndx++) {
        var item = this.items[ndx];
        tax += (item.taxed)? item.amount * this.taxRate : 0;
    }

    return tax;
});

InvoiceSchema.virtual('subtotal').get(function(){
    var amount = 0;

    for (var ndx=0; ndx<this.items.length; ndx++) {
        amount += this.items[ndx].amount;
    }

    return amount;
});

InvoiceSchema.virtual('total').get(function(){
    return this.amount + this.tax;
});

InvoiceSchema.set('toJSON', { getters: true, virtuals: true });

var ItemSchema = Schema({
   product: String,
   description: String,
   quantity: {type: Number, default: 1},
   rate: Number,
   taxed: {type: Boolean, default: false},
   category: String
});

ItemSchema.virtual('amount').get(function(){
    return this.rate * this.quantity;
});

ItemSchema.set('toJSON', { getters: true, virtuals: true });

module.exports = mongoose.model('Invoice', InvoiceSchema);

现在要了解这个问题，请看一下税收的虚拟定义＆＃39; ...

InvoiceSchema.virtual('tax').get(function(){
    var tax = 0;

    for (var ndx=0; ndx<this.items.length; ndx++) {
        var item = this.items[ndx];
        tax += (item.taxed)? item.amount * this.taxRate : 0;
    }

    return tax;
});

...在此示例中 item.amount ，在虚拟内部调用时，不会使用item.amount的虚拟getter。

有没有办法告诉Mongoose我需要使用getter而不是尝试读取一个不存在的属性？

Answer 1

你试过def login(request): password=request.POST['password'] email=request.POST['email'] try: d2 = Register.objects.latest('created_at') registered = Register.objects.get(email = email) except: return HttpResponse(Register.userManager.not_found_email()) pw_bytes = password.encode('utf-8') hashed = bcrypt.hashpw(pw_bytes, registered.salt) print hashed if hashed: print hashed print registered.password return HttpResponse(Register.userManager.incorrect_password()) return render(request, 'validation_app/success.html')吗？这似乎是使用虚拟的明确方式。

从这个问题得到它： https://github.com/Automattic/mongoose/issues/2326 遗憾的是没有找到任何相关内容。

如何使用Mongoose从另一个虚拟内部访问虚拟属性

1 个答案: