Backbone.js model.has method does not work on sub-objects - backbone.js

Question

I am developing applications with backbone.js and I sometime use JSON based models containing sub-objects, like this one :
{
"key1": "value1",
"key2": "value2",
"key3": {
"key1": "value1"
},
}
Now it seems that the model's method "has" (returning a boolean wether or not a key is part of the model) is not working for sub-objects.
For example, for the data above, this will return undefined
myModel.has("key3.key1")
Any idea how to treat this case?
Thanks

Answer 1

I would suggest, instead of overriding default behaviours, one can easily build this functionality with something similar to
var buildDeepMap = function(baseKey, map, obj){
_.each(obj, function(value, objKey){
var key = baseKey === ''? objKey : baseKey+'.'+objKey;
if(typeof value === 'object'){
buildDeepMap(key, map, value)
}else{
map[key]=value;
}
})
return map;
}
var MyModel = Backbone.Model.extend({
constructor: function(){
Backbone.Model.apply(this, arguments);
this.buildDeepMap();
},
buildDeepMap: function(){
this.deepFlatIndex = buildDeepMap('', {}, this.toJSON());
},
deepHas: function(key){
return _.has(this.deepFlatIndex, key)
}
});
usage can be like this
var data = {
"key1": "value1",
"key2": "value2",
"key3": {
"key1": "value1"
}
}
var myDeepHasModel = new MyModel(data);
console.log(myDeepHasModel.deepHas('key1')); //true
console.log(myDeepHasModel.deepHas('key3.key1')); //true
console.log(myDeepHasModel.deepHas('key3.key2')); //false