mongodb如何查找多个文档

Question

in mongodb how can i find multiple documents at ones??

in my post method i have appoinments collection.when getting post data i want check they already in database using hour_responce and date_responce but how can i do with 2 documents.its working fine with only one docement.

app.post('/collections/:collectionName', function(req, res, next) {
   console.log(req.body[0])
   if(req.params.collectionName == 'appoinments'){
      req.collection.findOne({date_responce:req.body[0].date_responce,hour_responce:req.body[0].hour_responce}, function(e, result){
          if(result){
            console.log(result); console.log(e)
            res.send(500,{error:"You Already have a Task on this Time Period"})
          }
          else{
            req.collection.insert(req.body, {}, function(e, results){
            if (e) return next(e)
            res.send(results)

             })
          }
      })
  }
  else{
     req.collection.insert(req.body, {}, function(e, results){
            if (e) return next(e)
            res.send(results)
        })
  }

})

---UPDATE----

{ toArray: [Function],
  each: [Function],
  next: [Function],
  nextObject: [Function],
  setReadPreference: [Function],
  batchSize: [Function],
  count: [Function],
  stream: [Function],
  close: [Function],
  explain: [Function],
  isClosed: [Function],
  rewind: [Function],
  limit: [Function],
  skip: [Function],
  hint: [Function],
  maxTimeMS: [Function],
  sort: [Function],
  fields: [Function] }

Answer 1

You are using findOne method of your collection.

You can try with : find() method, and then iterate on your resultset to make your comparisons

EDIT :

req.collection.find({}).toArray(function(e,result){

});