Redux Toolkit RTK Query 发送查询参数

如何使用 Redux Toolkit RTK 查询将查询参数传递到 api？

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

const baseUrl = 'xxxxxxx';

export const postsApi = createApi({
  reducerPath: 'posts',
  baseQuery: fetchBaseQuery({ baseUrl }),
  endpoints: (builder) => ({
    getPostsByYear: builder.query({
      query: (start, end) => { // Why is 'end' always undefined???
        return {
          url: 'posts/',
          params: { start, end },
        };
      },
    }),
    getPosts: builder.query({
      query: () => 'posts/',
    }),

    getPostByID: builder.query({
      query: (name) => `posts/${name}`,
    }),
  }),
});

export const { useGetPostsQuery, useGetPostsByYearQuery, useGetPostByIDQuery } = postsApi;

当尝试从组件传递参数时，仅start价值似乎得到了认可。year由内的 select 元素更新<PostOptions/>成分。它正在使用useState钩。该值正确更新并且useGetPostsByYearQuery被称为但是end参数始终未定义。所以，看来我没有正确定义 api 端点。有什么建议吗？我想要它做的就是以表单发送请求http://xxx/posts?start=start&end=end.

我什至尝试过对字符串值进行硬编码end参数，例如useGetPostsByYearQuery(year, '2019')，但它仍然显示为undefined使用 api 回调，所以我错过了一些更基本的东西。

const Post = () => {
 
  const year = useSelector((state) => state.postOptions.year);
  const yearPlusOne = parseInt(year, 10) + 1;
  const { data, error, isLoading } = useGetPostsByYearQuery(year, yearPlusOne);

  return (
    <SafeAreaView style={styles.container}>
      <View style={styles.content}>
        <PostHeading />
        <PostOptions></PostOptions>
      </View>
    </SafeAreaView>
  );
};

export default Post;

The QueryArg是一个泛型类型。

interface EndpointDefinitionWithQuery<
  QueryArg,
  BaseQuery extends BaseQueryFn,
  ResultType
> {
  query(arg: QueryArg): BaseQueryArg<BaseQuery>
}

See 源代码 https://github.com/reduxjs/redux-toolkit/blob/master/packages/toolkit/src/query/endpointDefinitions.ts#L56.

来自文档定义查询端点 https://redux-toolkit.js.org/rtk-query/usage/queries#defining-query-endpoints:

If the query回调需要额外的数据来生成 URL，因此应将其编写为采用单个参数。如果需要传递多个参数，请将它们格式化为单个“选项对象”。

所以你可以声明泛型参数QueryArg键入：builder.query像这样的方法：

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

const baseUrl = 'xxxxxxx';

export const postsApi = createApi({
  reducerPath: 'posts',
  baseQuery: fetchBaseQuery({ baseUrl }),
  endpoints: (builder) => ({
    getPostsByYear: builder.query<any, { start: string; end: string }>({
      query: (arg) => {
        const { start, end } = arg;
        console.log('arg: ', arg);
        return {
          url: 'posts/',
          params: { start, end },
        };
      },
    }),
  }),
});

export const { useGetPostsByYearQuery } = postsApi;

并像这样传递查询参数：

import React from 'react';
import { useGetPostsByYearQuery } from './hooks';

export default function App() {
  const { data, error, isLoading } = useGetPostsByYearQuery({ start: '2019', end: '2021' });
  return <div>app</div>;
}

The log:

arg:  { start: '2019', end: '2021' }

版本："@reduxjs/toolkit": "^1.6.0"