Question

方案

我有两个模型，一个是Expense，另一个是DailyExpense（包含一个Expense数组），顾名思义，Expense只是Expense中的一个项目，而DailyExpense拥有一大笔费用。

import { types } from 'mobx-state-tree';


/**
 * Expense model which holds individual item
 */
export const Expense = types.model({
    name:types.string,
    price:types.number,
    quantity:types.number,    
}).actions(self => ({
    changeName(newName) {
        self.name = newName
    },
    changePrice(newPrice) {
        self.price = newPrice
    },
    changeQuantity(newQuant) {
        self.quantity = newQuant
    },
})).views(self => ({
    get totalPrice () {
        return self.price * self.quantity
    }
}))


/**
 * DailyExpense model which have arrays of Expense 
 * Also have date as unique identifier
 */
export const DailyExpense = types.model({
    date:types.string,
    items:types.optional(types.array(Expense),[])
}).actions(self => ({
    changeDate (newDate) {
        self.date = newDate
    },    
    addItem (newItem) {
        self.items.push(newItem)
    },
    removeItem (name) {
        const index = self.items.findIndex(e => {
            if(e.name === name) 
                return e
        })
        self.items.splice(index,1)
    }
})).views(self => ({
    get totalPrice () {
        return self.items.reduce((sum,entry) => sum+(entry.price * entry.quantity),0)
    }
}))

问题

是否可以创建一个模型来跟踪我的所有DailyExpense

我知道我可以创建另一个模型，我可以做这样的事情

export const ExpenseList = types.model({
    list:types.array(DailyExpense)
})

但是我可以在没有任何变量的情况下创建模型，就像这里没有列表一样吗？（我知道这样做不行，我试过了）

export const ExpenseList = types.model(types.array(DailyExpense))

我尝试过创建以下模型

export const ExpenseList = types.model(types.array(DailyExpense))
.actions(self => ({
    add (s) {
        self.push(s);
    }
}))

我运行以下测试用例，但它给了我一个错误[mobx-state-tree] Functions are not supported as properties, use views instead

it ('can add in list', () => {
  const dailyExpense = DailyExpense.create ({
    date: today,    
    items: [
      {name: 'First Item', price: 20, quantity: 4},
      {name: 'Second Item', price: 10, quantity: 2},
      {name: 'Third Item', price: 5, quantity: 1}
    ],
  });
  const expenseList = ExpenseList.create(dailyExpense);

  expect(expenseList.length).toBe(1);
});

Answer 1

不，目前不支持：）

将mobx-state-tree模型作为模型数组

1 个答案: