Dynamic Properties on Model with EmberJS - ember.js

Question

Below is a basic ember model:
App.Person = DS.Model.extend({
firstName: DS.attr('string'),
birthday: DS.attr('date'),
day1: DS.attr('string'),
day2: DS.attr('string'),
day3: DS.attr('string')
});
For the purpose of this example, what if I had days go up to 50? Rather than going line by line... day4, day5, day6... is there a way to loop through dynamically? My first instinct is to use a MIXIN, and push these onto the object, but I don't think it would work if I had computed property:
isHoliday: function(){
if(this.get('day1') == 'off'){
return true;
}
}.property('day1'),
Given that 'this' is in there and we have a return, I don't believe you can simply 'push' this onto the model to generate something like this:
App.Person = DS.Model.extend({
firstName: DS.attr('string'),
birthday: DS.attr('date'),
day1: DS.attr('string'),
day2: DS.attr('string'),
day3: DS.attr('string'),
isHoliday: function(){
if(this.get('day1') == 'off'){
return true;
}
}.property('day1')
});

Answer 1

This is strange approach but still possible:
var defaults = {
firstName: DS.attr('string'),
birthday: DS.attr('date'),
isHoliday: function(){
if(this.get('day1') == 'off'){
return true;
}
}.property('day1')
}
var dayProps = {};
var count = 20;
while(count--){
dayProps['day' + (count + 1)] = DS.attr('string');
}
App.Person = DS.Model.extend(Ember.merge(defaults, dayProps));
instead defining with dynamic props, it is better to define Day model and have one-to-many relations with Person:
App.Person = DS.Model.extend({
days: DS.hasMany('day')
});
App.Day = DS.Model.extend({
person: DS.belongsTo('person')
});