How should I get the value of this input field? - ember.js

Question

I am using a subexpression at {{input value=(cents-to-dollars model.amountInCents)}}. It is using a custom helper to convert the value from cents to dollars. My API returns cents.
However in the controllers save action, console.log(this.get('model.amountInCents')); returns undefined. Am I missing something? Maybe name or valueBinding in the input helper?
If I remove the subexpression. console.log(this.get('model.amountInCents')); outputs fine.
// Routes
import Ember from 'ember';
export default Ember.Route.extend({
model: function(params) {
return this.store.find('product', params.product_id);
}
});
// Controller
export default Ember.Controller.extend({
actions: {
save: function() {
console.log(this.get('model.amountInCents')); // returns undefined
var _this = this;
var dollars = this.get('model.amountInCents');
var amountInCents = dollars / 100;
this.get('model').set('amountInCents', amountInCents);
this.get('model').save().then(function(product){
_this.transitionToRoute('admin.products.show', product);
}, function() {
// Need this promise, so we can render errors, if any, in the form
});
return false;
},
cancel: function() {
this.transitionToRoute('products.show', this.get('model'));
}
}
});
// Template
<form {{action "save" on="submit"}}>
<p>
<label>Name:
{{input value=model.name}}
</label>
</p>
<p>
<label>Amount in cents:
{{input value=(cents-to-dollars model.amountInCents)}}
</label>
</p>
<input type="submit" value="Save"/>
<button {{action "cancel"}}>Cancel</button>
</form>

Answer 1

First of all, (at least in version 1.9.1) what you are proposing doesn't really work (see here - the value appears outside of the input field). The real problem, I think, is that you are not binding to a property and instead are binding to a string returned from a helper (which is not what you want).
So, what can you do?
You can set up a dollars computed property as follows:
App.IndexController = Ember.ObjectController.extend({
dollars: function(key, value){
if (arguments.length > 1) {
var dollars = value;
this.set('amountInCents', parseInt(dollars) * 100);
}
return this.get('amountInCents') / 100;
}.property('model.amountInCents')
});
Full working example here