当我从createEntityAdapter获得类型记录中的选择器时出现错误

Question

在开发一个简单的宠物项目时，我遇到了一个错误，不知道如何修复它。我对打字稿很陌生，从一个信息错误判断，错误在TS中。在将此片段添加到文件“apiSlice.ts”后会出现错误消息。

export const { selectAll: selectAllPizzas } = pizzasAdapter.getSelectors(
    state => selectPizzasData(state) ?? initialState
)

错误文本如下所示：

ERROR in src/features/api/apiSlice.ts:44:31
TS2345: Argument of type 'unknown' is not assignable to parameter of type '{ api: CombinedState<{ getPizzas: QueryDefinition<void, BaseQueryFn<string | FetchArgs, unknown,
 FetchBaseQueryError, {}, FetchBaseQueryMeta>, never, PizzaResponseType[], "api">; }, never, "api">; }'.
    42 | //
    43 | export const { selectAll: selectAllPizzas } = pizzasAdapter.getSelectors(
  > 44 |     state => selectPizzasData(state) ?? initialState
       |                               ^^^^^
    45 | )
    46 |

整个文件：(注意最后三行)

import { createApi, fetchBaseQuery } from '@reduxjs/toolkit/query/react'
import { createEntityAdapter, createSelector } from '@reduxjs/toolkit'

const pizzasAdapter = createEntityAdapter()
const initialState = pizzasAdapter.getInitialState()

interface PizzaResponseType {
    id: string
    name: string
    image: string
    price: number
    currencySign: string
    popularityPoint: number
    type: string
    description: string
    spec: string
}
export const apiSlice = createApi({
    reducerPath: 'api',
    baseQuery: fetchBaseQuery({ baseUrl: '' }),
    endpoints: builder => ({
        getPizzas: builder.query<PizzaResponseType[], void>({
            query: () => '/pizzas',
            transformResponse: (responseData: PizzaResponseType[]) => {
                pizzasAdapter.setAll(initialState, responseData)
                return responseData
            },
        }),
    }),
})

export const { useGetPizzasQuery } = apiSlice

export const selectPizzasResult = apiSlice.endpoints.getPizzas.select()

// console.log(selectPizzasResult)

export const selectPizzasData = createSelector(
    selectPizzasResult,
    pizzasResult => pizzasResult.data
)
//
export const { selectAll: selectAllPizzas } = pizzasAdapter.getSelectors(
    state => selectPizzasData(state) ?? initialState
)

RootState是从store.ts文件中导入的，我在这里配置了存储，因为它是Redux文档中的witten。store.ts文件：

const store = configureStore({
    reducer: {
        pizzas:pizzaSlice,
        [apiSlice.reducerPath]: apiSlice.reducer,
    },
    middleware: getDefaultMiddleware => getDefaultMiddleware().concat(apiSlice.middleware),
})
export type RootState = ReturnType<typeof store.getState>
export default store

为参数中的状态插入了导入的RootState类型：

export const { selectAll: selectAllPizzas } = pizzasAdapter.getSelectors(
    (state: RootState) => selectPizzasData(state) ?? initialState
)

而这一变化没有任何作用。无论如何，会出现错误：

ERROR in src/features/api/apiSlice.ts:46:5
TS2345: Argument of type '(state: RootState) => EntityState<unknown> | PizzaResponseType[]' is not assignable to parameter of type '(state: { pizzas: EntityState<unknown>; api: CombinedState<{ getPizzas: Query
Definition<void, BaseQueryFn<string | FetchArgs, unknown, FetchBaseQueryError, {}, FetchBaseQueryMeta>, never, PizzaResponseType[], "api">; }, never, "api">; }) => EntityState<...>'.
  Type 'EntityState<unknown> | PizzaResponseType[]' is not assignable to type 'EntityState<unknown>'.
    Type 'PizzaResponseType[]' is missing the following properties from type 'EntityState<unknown>': ids, entities
    44 |
    45 | export const { selectAll: selectAllPizzas } = pizzasAdapter.getSelectors(
  > 46 |     (state: RootState) => selectPizzasData(state) ?? initialState
       |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    47 | )

怎么修呢？

万一你想运行宠物项目。遵循以下链接：https://github.com/AlexKor-5/ReactPizzaApp_Ts/tree/27028d4275fef75a70eb6b0b4b129e5bf5997e78(但是更改apiSlice文件的末尾，使其对应于当前堆栈溢出页面上显示的文件)。(src/features/api/apiSlice.ts )

另外，当我写<EntityState<PizzaResponseType>时，它应该是什么样子的。请看下面的例子：

getPizzas: builder.query<EntityState<PizzaResponseType>, void>({
            query: () => '/pizzas',
            transformResponse: (responseData: PizzaResponseType[]) => {
                return pizzasAdapter.setAll(pizzaInitialState,responseData)
            },
        }),

我又犯了一个错误：

TS2322: Type '(responseData: IPizzaType[]) => EntityState<unknown>' is not assignable to type '(baseQueryReturnV
alue: unknown, meta: FetchBaseQueryMeta | undefined, arg: void) => EntityState<IPizzaType> | Promise<EntityState
<IPizzaType>>'.
  Type 'EntityState<unknown>' is not assignable to type 'EntityState<IPizzaType> | Promise<EntityState<IPizzaTyp
e>>'.
    Type 'EntityState<unknown>' is not assignable to type 'EntityState<IPizzaType>'.
      Type 'unknown' is not assignable to type 'IPizzaType'.
    28 |         getPizzas: builder.query<EntityState<IPizzaType>, void>({
    29 |             query: () => '/pizzas',
  > 30 |             transformResponse: (responseData: IPizzaType[]) => {
       |             ^^^^^^^^^^^^^^^^^
    31 |                 return pizzasAdapter.setAll(pizzaInitialState, responseData)
    32 |             },
    33 |         }),

又出什么事了？

Answer 1

根据@phry最初的回复，我认为问题在于您的transformResponse函数：

            transformResponse: (responseData: PizzaResponseType[]) => {
                pizzasAdapter.setAll(initialState, responseData)
                return responseData
            },

该代码有几个问题：

• 您正在返回原始的responseData，它仍然是一个PizzaResponseType[]。这告诉TS，结果也是一个EntityState<Pizza>.
• In，当它应该是一个PizzaResponseType[]命令时，您需要从pizzasAdapter.setAll()返回值.

Answer 2

您必须为state提供一个类型。

(state: RootState) => selectPizzasData(state) ?? initialState

Answer 3

我用这种方式重做了一遍

getPizzas: builder.query<EntityState<unknown>, void>({
            query: () => '/pizzas',
            transformResponse: (responseData: PizzaResponseType[]) => {
                return pizzasAdapter.setAll(initialState, responseData)
            },
        }),

再加上这个片段：

export const { selectAll: selectAllPizzas } = pizzasAdapter.getSelectors(
    (state: RootState) => selectPizzasData(state) ?? initialState
)

在所有这些更改之后，错误消失了。