node.js - How to display a Mongo field on Nodejs with Mongoose and Jade? -

currently see displaying entire document, not 1 field. how display 1 field?

i have tried following i'm getting "undefined"s don't see displayed.

way 1 main js:

// app.js  var schema = new mongoose.schema({ a_field : string },                                   { collection : 'the_col_with_data' }); var documentmodel = mongoose.model('doc', schema); var a_document = documentmodel.findone({}, callback);  app.get('/', function(req, res) {     res.render('index', {                             pass_var: a_document.a_field                         }); }); 

way 1 view:

// index.jade  #{ pass_var } 

---

way 2 main js:

// app.js  var schema = new mongoose.schema({ a_field : string },                                   { collection : 'the_col_with_data' }); var documentmodel = mongoose.model('doc', schema); var a_document = documentmodel.findone({}, callback);  app.get('/', function(req, res) {     res.render('index', {                             pass_var: a_document                         }); }); 

way 2 view:

// index.jade  #{ pass_var.a_field } 

interaction mongoose asynchronous. means, can't rely on return value of mongoose operation. have perform logic operates on document within callbacks. in case, a_document doesn't point document you're trying find. instead, have use document within callback:

app.get('/', function(req, res) {     documentmodel.findone({}, function(err, doc) {         if(err) {             res.send(500);             return;         }         res.render('index', {pass_var: doc});     }); });