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
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