Question

我有一个包含值列表的数组，其中一些是需要解析的promise。

allGlobalFilters": [
    {
      "id": 503,
      "pubId": 18,
      "type": 15,
      "value": "{ \"adsize\":  [\"638x335\" , \"400x300\" , \"300x1050\", \"320x100\", \"640x480\" , \"700x392\",  \"360x480\", \"896x502\", \"960x538\", \"1024x573\", \"1088x609\"]}",
      "status": 4,
      "createTs": null,
      "updateTs": null,
      "createUser": "MMM",
      "updateUser": null,
      "percentage": 100,
      "rtbSspPublishers": { // the promise part 
        "id": 18,
        "name": "Mobile Nations\r\n",
        "domain": "http://www.mobilenations.com",
        "extPublisherId": 17
      }
    },
    {
      "id": 505,
      "pubId": 19,
      "type": 15,
      "value": "{ \"adPlatformType\": [\"APP\"] }",
      "status": 4,
      "createTs": null,
      "updateTs": null,
      "createUser": null,
      "updateUser": null,
      "percentage": 0,
      "rtbSspPublishers": { // the promise part
        "id": 19,
        "name": "Tom's Guide",
        "domain": "www.tomsguide.com",
        "extPublisherId": 17
      }
    },
    {
      "id": 514,
      "pubId": 19,
      "type": 15,
      "value": "{ \"adPlatformType\": [\"WEB\"] }",
      "status": 4,
      "createTs": null,
      "updateTs": null,
      "createUser": null,
      "updateUser": null,
      "percentage": 100,
      "rtbSspPublishers": { // the promise part
        "id": 19,
        "name": "Tom's Guide",
        "domain": "www.tomsguide.com",
        "extPublisherId": 17
      }
    },
    {
      "id": 516,
      "pubId": 19,
      "type": 15,
      "value": "{\"adPlatformType\": [\"MOBILE_WEB\"]}",
      "status": 4,
      "createTs": null,
      "updateTs": null,
      "createUser": null,
      "updateUser": null,
      "percentage": 100,
      "rtbSspPublishers": { // the promise part
        "id": 19,
        "name": "Tom's Guide",
        "domain": "www.tomsguide.com",
        "extPublisherId": 17
      }
    }
  ]

现在我需要在承诺的条件下过滤这个数组，我该怎么做。

这就是我的尝试。

 data.filter(d => d.rtbSspPublishers.get().then(res => res.name.includes('Mobile')));

但这似乎不起作用。如何获取异步值以使用数组过滤器？

Answer 1

只需将promises映射到promise all中的数组，等待它们解析，然后将它们映射回一个新数组。你可以覆盖旧数组或只是保持对新数组的引用。

public function user()
    {
    return $this->belongsTo('App\User', 'user_id');
    }

无对象传播的更新

let allGlobalFilters = [{
  "id": 503,
  "pubId": 18,
  "type": 15,
  "status": 4,
  "createTs": null,
  "updateTs": null,
  "createUser": "MMM",
  "updateUser": null,
  "percentage": 100,
  "rtbSspPublishers": Promise.resolve({
    "id": 18,
    "name": "Mobile Nations",
    "domain": "http://www.mobilenations.com",
    "extPublisherId": 17
  })
}]

Promise.all(allGlobalFilters.map(({rtbSspPublishers}) => rtbSspPublishers)).then(values => {
  const theNewValues = allGlobalFilters
                      .map((item, i) => ({...item, rtbSspPublishers: values[i]}))
                      .filter(item => item.rtbSspPublishers.name.startsWith('Mobile'))
  })

Answer 2

更通用的答案......

使用我之前准备的简单“助手”

promiseProps = obj => {
    const keys = Object.keys(obj);
    return Promise.all(Object.values(obj)).then(results => Object.assign({}, ...results.map((result, index) => ({[keys[index]]: result}))));
};

你只需

Promise.all(allGlobalFilters.map(obj => promiseProps(obj)))
.then(result => result.filter(({rtbSspPublishers}) => rtbSspPublishers.name.includes('Mobile'))
.then(filteredResult => {
    // filteredResult is your allGlobalFilters with promises resolved
    // filtered to include only the required items
    console.log(filteredResult );
});

无论承诺中有多少（第一级）属性

，这都会有效

过滤和包含Javascript中的承诺的对象数组

2 个答案: