Question

我遇到了一个问题，我不确定采取什么措施来修复它。现在所有的数据都被正确检索，但是responseCallback永远不会被触发，因此我没有使用响应数组到达res.json调用。这里的任何指导将不胜感激！感谢。

为了澄清问题，问题在于aysnc.each回调。

$myFile = fopen('path/to/file', 'w') or die('Problems');
$client = new \GuzzleHttp\Client();
$request = $client->get('https://www.yourdocumentpage.com', ['save_to' => $myFile]);

这是我希望将更新的商业信息返回给客户的地方，但这永远不会触发。

  var updatedBusinesses = [];
  googleplaces.radarSearch({location:"lat,long",radius:"10000",keyword:"keywordhere"},function(err,response){
   if(err){return next(err);}

   async.each(response.results,function(currResponse,responseCallback){
    Business.findOne({"placesId":currResponse.place_id,"claimed":true}).populate({path:'services',select:''}).exec(function(err,business){
     if(err){return next(err);}

     if(business !== null){
       Service.populate(business.services,{path:'employees',select:'_id appointments firstName lastName username avatarVersion'},function(err,newBusiness){
        if(err){return next(err);}

        googleplaces.placeDetailsRequest({placeid:business.placesId},function(error,placesResult){
         if(error){return responseCallback(error);}

         console.log("RESULT OF THE GOOGLE PLACES DETAIL SEARCH")
         placesResult.result.info = business;
         updatedBusinesses.push(placesResult.result);
         // Here the data is populated and correct.
         // console.log(updatedBusinesses)
         responseCallback();

       });
     })
   }
 })
},function(err){
   if(err){return next(err);}
   console.log("called")
   res.json(updatedBusinesses);
 })
})

Answer 1

async.each（）期望每次迭代都会调用一个回调（responseCallback）。如果没有打电话，它会坐在那里等待它。这就是为什么您的更新业务部分永远不会被调用的原因。

在async.each（）中，有许多地方调用next（）而不是async.each（）迭代的回调（responseCallback）。以下是正确调用回调的修订代码：

var updatedBusinesses = [];

googleplaces.radarSearch({location:"lat,long",radius:"10000",keyword:"keywordhere"},function(err,response){
    if(err){return next(err);}

    async.each(response.results,function(currResponse,responseCallback){
        Business.findOne({"placesId":currResponse.place_id,"claimed":true}).populate({path:'services',select:''}).exec(function(err,business){
            if(err){
              return responseCallback(err);// <== calling responseCallback instead of next() 
            } 

            // in case of business === null/undefined, I'm not seeing any 
            // callback getting called, it needs to be called inside 
            // async.each() no matter which condition it is
            if (!business) {
               // call responseCallback to continue on with async.each()
                return responseCallback();
            }
            Service.populate(business.services,{path:'employees',select:'_id appointments firstName lastName username avatarVersion'},function(err,newBusiness){
                if(err){
                  return responseCallback(err);// <== calling responseCallback instead of next() 
                }

                googleplaces.placeDetailsRequest({placeid:business.placesId},function(error,placesResult){
                    if(error){return responseCallback(error);}

                    console.log("RESULT OF THE GOOGLE PLACES DETAIL SEARCH")
                    placesResult.result.info = business;
                    updatedBusinesses.push(placesResult.result);
                    // Here the data is populated and correct.
                    // console.log(updatedBusinesses)
                    responseCallback();
                });
            })
        })
    },function(err){
        if(err){return next(err);}
        console.log("called");
        res.json(updatedBusinesses);
    });
});

所以现在为async.each（）中的每个条件调用responseCallback（）。它应该归结为更新的商业信息＆＃34;现在代码的一部分。

Answer 2

使用responseCallback();更改代码responseCallback(null, [your-result]);我认为应该完成这项工作

var updatedBusinesses = []; googleplaces.radarSearch({location:"lat,long",radius:"10000",keyword:"keywordhere"},function(err,response){

if(err){return next(err);}

async.each(response.results,function(currResponse,responseCallback){    Business.findOne({"placesId":currResponse.place_id,"claimed":true}).populate({path:'services',select:''}).exec(function(err,business){
 if(err){return next(err);}

 if(business !== null){
   Service.populate(business.services,{path:'employees',select:'_id appointments firstName lastName username avatarVersion'},function(err,newBusiness){
    if(err){return next(err);}

    googleplaces.placeDetailsRequest({placeid:business.placesId},function(error,placesResult){
     if(error){return responseCallback(error);}

     console.log("RESULT OF THE GOOGLE PLACES DETAIL SEARCH")
     placesResult.result.info = business;
     updatedBusinesses.push(placesResult.result);
     // Here the data is populated and correct.
     // console.log(updatedBusinesses)
     responseCallback(null, updatedBusinesses);

   });
 })
} }) },function(err, updatedBusinesses){
   if(err){return next(err);}
   console.log("called")
   res.json(updatedBusinesses);
 })
})

没有达到异步回调，响应挂起

2 个答案: