I believe there may be 3 possible solutions:
- You may try to use fibers to make Your async code looks like a sync. I
gues it may work, but I'm not sure about it.
- Hack Backbone Model, it's sources are small and clear and it shouldn't be
too complex.
- Create Your own async model. You can use any model implementation with
Backbone.js, it's very modular and works well with custom stuff.
For example, here's my own custom model I use with Backbone for my project
(I did it because I don't like to write user.get('name') and prefer
user.name and also for some other reasons)
https://github.com/alexeypetrushin/rad_core/blob/master/assets/rad/models.coffee
https://github.com/alexeypetrushin/rad_core/blob/master/assets/rad_spec/model_spec.coffee
On Tuesday, March 20, 2012 3:12:57 PM UTC+4, Bika wrote:
>
> hi,
>
> I'm trying to use backbone for "everything" on the server side too, and
> got stuck with doing a proper validation. The problem is that backbone's
> validate method return a boolean, and the validation mechanics should be
> implemented inside of it, but with node these mechanics are asynchronous,
> thus the validate method returns before evaluating my code.
>
> Here is a code sample that illustrates well my setup:
>
> Backbone.Model.extend({
> validate: function(){
> var result;
> Jobs._withCollection(function(err, collection){
> collection.count(query, function(count){
> result = count > 1 ? "Job already exist" : null;
> });
> })
> return result;
> }
> })
>
> I might be able to improve this a little bit, but I'm not sure if this
> would work:
>
> function _validate(){
> Jobs._withCollection(function(err, collection){
> collection.count(query, function(count){
> yield count > 1 ? "Job already exist" : null;
> });
> })
> }
>
> Backbone.Model.extend({
> validate: function(){
> return _validate.call(this);
> }
> })
>
> Especially not for a bit more complex situations where I use async for
> example, and the return value is set in the last callback of async, like
> here (this is obviously wrong as res is null at return):
>
> Backbone.Model.extend({
> validate: function(){
> var res;
> async.parallel([
> .. do stuff ..
> ], function(err, results){
> res = results;
> })
> return results;
> }
> })
>
> Any ideas?
>
> Viktor
> close
>
>
>
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