Question

我想在eachOf循环中添加嵌套数据库查询，该循环应该是同步的。尝试了这么多组合，但是没有任何东西适用于foreach循环内部。

   async.eachOf(nc.virtual_devices, function (vd) {
         ///////// This code work fine /////////////
        var domain = extractDomain(vd.api_url);
        vd.raw_api_ip = vd.api_ip;
        vd.api_ip = getProxiedPath(vd.api_ip);
        vd.raw_api_url = vd.api_url;
        vd.api_url = nconf.get('PROXIED_PATH_SCHEME') + vd.api_ip + vd.api_url.split(domain)[1];
          // Path to websocket notifications
        vd.ws_url = nconf.get('PROXIED_PATH_SCHEME') + vd.api_ip + vd.notification_base_uri;

     //// THIS CODE IS NOT FINE //////////////
        if (nc.type === 'XXX'){

            var promise = new Promise (function (resolve,reject) {

            console.log("********XX VD TYPE **********");
            console.log(JSON.stringify(vd));
            console.log("VD ID VALUE IS ", vd.id);
            var newID = (vd.id).replace(/\d_/, "");
            console.log("VD ID VALUE IS ", newID);

            var _idofSubgroup;
            var labeltoSearch = nc.type + ' ' + nc.version;
            pattern = "/^" + newID + "/i";
            test = _idofSubgroup;
            pattern = newID;
            console.log(pattern);

            db.collection('subgroups').findOne({label: labeltoSearch}, function (err, result) {
                console.log(result._id);
                _idofSubgroup = result._id;

                db.collection('exploreposts').find({subgroup: result.id_}, {title: {"$regex": pattern}}).toArray(function (err, results) {
                    console.log(results);
                })
        });
        })
    }
  });

在里面承诺，但也在痛苦中。这是我尝试过的代码不能正常工作。任何建议都会受到赞赏。就像简单地说我一直被困在回调地狱

   async.eachOf(nc.virtual_devices, function (vd) {
         ///////// This code work fine /////////////
        var domain = extractDomain(vd.api_url);
        vd.raw_api_ip = vd.api_ip;
        vd.api_ip = getProxiedPath(vd.api_ip);
        vd.raw_api_url = vd.api_url;
        vd.api_url = nconf.get('PROXIED_PATH_SCHEME') + vd.api_ip + vd.api_url.split(domain)[1];
          // Path to websocket notifications
        vd.ws_url = nconf.get('PROXIED_PATH_SCHEME') + vd.api_ip + vd.notification_base_uri;

     //// THIS CODE IS NOT FINE with promises also  //////////////
        if (nc.type === 'XXX'){

            var promise = new Promise (function (resolve,reject) {

            console.log("********XX VD TYPE **********");
            console.log(JSON.stringify(vd));
            console.log("VD ID VALUE IS ", vd.id);
            var newID = (vd.id).replace(/\d_/, "");
            console.log("VD ID VALUE IS ", newID);

            var _idofSubgroup;
            var labeltoSearch = nc.type + ' ' + nc.version;
            pattern = "/^" + newID + "/i";
            test = _idofSubgroup;
            pattern = newID;
            console.log(pattern);

            db.collection('subgroups').findOne({label: labeltoSearch}, function (err, result) {
                console.log(result._id);
                _idofSubgroup = result._id;
                resolve ({id_:_idofSubgroup,pattern1 : pattern});
            })
        });
        promise.then (function(result) {
            console.log(result.id_);
            console.log(result.pattern1);
                db.collection('exploreposts').find({subgroup: result.id_}, {title: {"$regex": result.pattern1}}).toArray(function (err, results) {
                    console.log(results);
                })
        },function (err){
            console.log (err);
       })


    }
  });

Answer 1

您似乎不需要使用Message，而是使用async.each()或async.eachSeries()。

这是未经测试但看起来像

async.eachOf

我故意命名变量和函数，以便您了解。

如果有任何问题，请按日志。

mongodb查询内部节点js eachOf循环

1 个答案: