Create checkbox list in Backbone.js - backbone.js

Question

I'd like to create a form which contains a text field and a list of checkboxes.
Using the underscore template function with a _.each() statement I can get it rendered.
When I click the save button I get the model (with the text field) but the array for the checkboxes is not where it should be....
This my view model:
window.SpotEditView= Marionette.View.extend({
initialize: function () {
var featureList = ['Rail', 'Curb','Pipe'];
//this.el = this.compiledTemplate(this.model.toJSON());
var viewModel = this.model.toJSON();
viewModel.features = featureList;
$(this.el).html( _.template(htmlBody, viewModel));
return;
},
render: function () {
return this;
},
events: {
"change" : "change",
"click .save" : "beforeSave",
"click .delete" : "delete",
"drop #picture" : "dropHandler"
},
beforeSave: function () {
var self = this;
var check = this.model.validateAll();
if (check.isValid === false) {
utils.displayValidationErrors(check.messages);
return false;
}
// Upload picture file if a new file was dropped in the drop area
if (this.pictureFile) {
this.model.set("picture", this.pictureFile.name);
utils.uploadFile(this.pictureFile,
function () {
self.save();
}
);
} else {
self.save();
}
return false;
},
save: function () {
var self = this;
this.model.save(null, {
success: function (model) {
self.render();
var point = model.toMarker();
app.mapView.model.markers.add(point);
app.navigate('map', true);
app.mapView.openInfo(point);
},
error: function () {
utils.showAlert('Error', 'An error occurred while trying to save this item', 'alert-error');
}
});
}
});
This is the relevant part of my html template:
<% _.each(features, function(f,key) { %>
<label class="checkbox">
<input type="checkbox" name="features[<%= key-1 %>]" value="<%= f %>">
<%= f %>
</label>
<% }); %>
The model that the save function recieves looks like this:
{..
attributes:{ ...
features:[],
features[1]:'Dick',
...
}
}
It seems as if the backbone 'form-parser' cannot handle the array.
Is there a fix or a better solution to this approach?