WordPress Rest API 获取所有帖子

Question

我使用以下内容来获取帖子

http://demo.wp-api.org/wp-json/wp/v2/posts

默认情况下，这会给我 10 个帖子，文档中提到了这一点。

但我想要所有帖子而不必跟踪分页。

这可能吗？

如果没有，我可以运行 JavaScript 循环来获取所有帖子吗？

谢谢。

Answer 1

解决此问题的一种方法是使用 RxJS

我们将构建一个小型 Observable 流，它将:

• 输出所有发布数据
• 不要强制我们事先知道帖子总数或页数
• 不强制在分页上下文中跟踪“我们所处的位置”

我们将使用的库:

• Axios (为了简化 HTTP GET，因为它可以在节点和浏览器环境中工作)
• RxJS v6 (目前是 Alpha 版本，但这里的 API 与 RxJS 5 相同)

您的环境和用例会有所不同，在本示例中，我将处于 Node 环境中。

/**
 *      This will get all posts from a default WordPress REST API
 *      First we see how many pages there are
 *      Then we make subsequent XHR requests (via Axios)
 *      That paginate through every page of posts
 */

// Importing Axios for simple AJAX request
const axios = require('axios')

// Importing RxJS @ v6.0.0-alpha.3
const { Observable, from, range } = require('rxjs')
const { switchMap, concatMap } = require('rxjs/operators')

const endpoint = 'http://demo.wp-api.org/wp-json/wp/v2/posts'

/**
 *      This sets up the initial request and the Observable stream
 *      In the return from the endpoint, the Axios request headers will have x-wp-totalpages,
 *      which gives us... the total pages of posts ;)
 */
const posts$ = Rx.Observable.from(axios.get(endpoint))
    /**
     *     We now know the total number of pages,
     *     so we'll switch to a new Observable that is just a range of numbers
     *     We'll start with 1, and end with whatever the total number of pages is
     *     This gives us a stream of 1--n--n--n... (example: 1, 2, 3, 4...)
     */
    .switchMap((
        { headers }, // using ES6 function header destructuring and arrow functions here
    ) => Rx.Observable.range(1, Number(headers['x-wp-totalpages'])))
    /**
     *     We can now paginate through all posts, getting 10/page
     *     concatMap will fire off a request, waits until it completes, and then fire the next one
     *     In each subsequent firing, we ask for the next page of posts
     */
    .concatMap(page =>
        axios.get(endpoint, {
            params: {
                page,
            },
        }),
    )
    .subscribe(
        // data here is an Array of WordPress Posts, tacking .length shows us how many per page we are getting
        ({ data }) => console.log(data.length),
        err => console.log('Oh no, an error!', err),
    )

资源

• RunKit example with the code above (唯一的区别是在 RunKit 示例中导入 RxJS v5，因为 v6 尚不可用，但此示例的 API 没有 不同)
• RxJS In Depth - Ben Lesh (视频，主要维护者对 RxJS 的良好介绍)
• The introduction to Reactive Programming you've been missing (@andrestaltz RxJS 介绍的最佳文本资源)
• https://www.learnrxjs.io/
• Destructuring objects as function parameters in ES6
• Arrow Functions on MDN (检查基本和高级语法)