Relational MongoDB with async foreach library

vendors_relation.js

  app.get('/vendors.json', function(req, res) {
      var session = req.session;
      var query   = mods.url.parse(req.url,true).query;

      var p_vendors = mods.mongoose.model('p_vendors');
      var vendors   = mods.mongoose.model('vendors');
     
      var results = [];
      
      p_vendors.find({ account_id: session.account_id }, function(err, docs) {
        var async   = mods.async;
     
        var pushDoc = function(item, callback) {
          if(item) {
            vendors.findOne({ _id: item.vendor_id, description: new RegExp(query.query, 'i')}, function(err, vendor) {             
             
              if(vendor != null) {
                results.push(vendor);
                callback();
              } else callback();
            });
          }                 
        };

        async.forEach(docs, pushDoc , function(err) {
          if(err)
            console.log(err);
           
          var response = {
            success: true,
            results: results.length,
            items: results
          }
         
          res.send(response);
        });
      });
});