Data posted to api empty?

My api is Asp.net web api, so I’m using the web-api adapter and serializer (both empty, other than the api url in the adapter)

I can get data from my api just fine, and after a bit of struggle, manage to hit the put and post methods as well (all running locally, so I can debug)

I’m going back to the books on this, but while doing so figured I’d ask: Like I said I can do a GET fine and get the data back (api model and ember model exactly the same, and I use the same model for the PUT and POST’s)

When I do an update or create (thus ember do a PUT or POST) it does call the correct api method, but the object received have all it’s properties empty, so not sure what I’m doing wrong here?

export default Ember.Route.extend({

model() {
    return this.store.createRecord('deal');
},

actions : {

    saveDeal(newDeal) {
        newDeal.save().then(() => this.transitionTo('deals'));
    } .....

Just occured to me to create a test model (both in api and in ember) with straight text fields, since this “deal” form have several instances of a custom component I created. It just render a dropdown with options, so not sure why that would be a problem (some code below for in case…?)

{{select-component datatype=‘dealtype’ selectedId=model.dealType.id}}

export default Ember.Component.extend({

tagName: 'select',
classNames: ['form-control'],
datatype: '',
items: [],
selectedId: 0,
store: Ember.inject.service(),

didReceiveAttrs : function(){
    this._super(...arguments);        
    Ember.run.scheduleOnce('afterRender', this, this.afterRenderEvent);
},

afterRenderEvent : function(){
    var store = this.get('store'); 
    let items =  store.findAll(this.get('datatype'));
    this.set('items', items);
    Ember.run.later(function() {
        Ember.$('select').select2();
    });
}   

});

{{#each items as |item|}}
    {{#if (eq selectedId item.id)}}
        <option selected="selected" value="{{item.id}}">{{item.name}}</option>
    {{else}}
        <option  value="{{item.id}}"> {{item.name}} </option>
    {{/if}}
{{/each}}