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devolver variable de una devolución de llamada anidada en node.js

Tengo los resultados de mi consulta en result pero no puedo pasarlo al navegador, se muestra vacío. ¿Cómo puedo devolver el result a res.send('result') ?

 myApp.get('/agg',function(req,res){ MongoClient.connect(url, function(err, db) { // Execute aggregate, notice the pipeline is expressed as an Array db.collection('projects').aggregate([{$match:{school_state:"DC"}}, {$group:{_id: "$primary_focus_subject",total_amount:{$sum: "$total_donations"}}}],function(err,result){ console.log(result); db.close(); }); }); res.send(result);

});

over 4 years ago · Santiago Trujillo
1 answers
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Tienes 2 soluciones:

  • poner res.send(result); donde tienes console.log(result)

  • tener una promesa envolviendo su MongoClient.connect así:

     let promise = new Promise((resolve,reject)=>{ MongoClient.connect(url,function(err,db){ db.collection('projects').aggregate([{$match:{school_state:"DC"}}, {$group:{_id: "$primary_focus_subject",total_amount:{$sum: "$total_donations"}}}],function(err,result){ if(err) reject(err) resolve(result); }); }); })
over 4 years ago · Santiago Trujillo Report
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