[英]Proxy in mobx -state-tree
I'm trying to build a simple budgeting app.我正在尝试构建一个简单的预算应用程序。 Whenever I insert this model into my app.
每当我将此 model 插入我的应用程序时。 I get a proxy for the expenses.
我得到了费用的代理。 Where is the flaw in my thinking?
我的思维缺陷在哪里?
I have an action on the Budget.js when I print it in the useEffect this is what console.log outputs for the expenses a proxy.当我在 useEffect 中打印 Budget.js 时,我对 Budget.js 进行了操作,这是 console.log 为代理费用输出的内容。 I'm expecting it to print the actual data from the initial state.
我期待它从最初的 state 打印实际数据。
React.useEffect(() => {
budget.addDummyData()
console.log(budget.expenses)
}, [])
[[Handler]]: Object
[[Target]]: Array(0)
[[IsRevoked]]: false
//////////////////////////////////////////////////////////////////////
//SubCategory
const SubCategory = types
.model('SubCategory', {
id: types.maybeNull(types.string, ''),
name: types.maybeNull(types.string, ''),
amount: types.maybeNull(types.number, 0)
})
const SubCategoryStore = types.model({ subCategory: types.optional(SubCategory, {}) })
export default SubCategoryStore
/////////////////////////////////////////////////////////////////////////
//Category.js
const Category = types
.model('Category', {
id: types.maybeNull(types.string, ''),
name: types.maybeNull(types.string, ''),
subCategories: types.array(SubCategory)
})
const CategoryStore = types.model({ category: types.optional(Category, {}) })
export default CategoryStore
///////////////////////////////////////////////////////////////
// Budget
const Budget = types
.model('Budget', {
totalIncome: 200,
expenses: types.array(Category)
// incomes: types.optional(types.array(Category), [])
}).actions({
addDummyData() {
self.expenses.push(initialStateExpenses)
}
})
const BudgetStore = types.model({ budget: types.optional(Budget, {}) })
export default BudgetStore
const initialStateExpenses = {
id: '123',
name: 'Food',
subCategories: [
{
id: '1314',
name: 'Grocery',
amount: 250
},
{
id: '1442',
name: 'Restaurants',
amount: 50
}
]
}
expenses is of type Category[], you are passing an object.费用属于类别 [],您传递的是 object。 I assume you want to set the expenses from
subCategories
.我假设您想从
subCategories
设置费用。 If so you can try this如果是这样你可以试试这个
addDummyData() {
initialStateExpenses.subCategories.forEach(ex => self.expenses.push(ex))
}
or
addDummyData() {
self.expenses = initialStateExpenses.subCategories
}
A better approach would be to pass the initialStateExpenses
via args to the addDummyData
function so your model doesn't depend on external variables更好的方法是通过 args 将
initialStateExpenses
传递给addDummyData
function 所以你的 model 不依赖于外部变量
addDummyData(initialStateExpenses) {
initialStateExpenses.subCategories.forEach(ex => self.expenses.push(ex))
}
or
addDummyData(initialStateExpenses) {
self.expenses = initialStateExpenses.subCategories
}
then use it like
budget.addDummyData(initialStateExpenses)
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