# Looking for walkthrough / tutorial on complex models (changed in dropdown)

**URL:** <https://discuss.emberjs.com/t/looking-for-walkthrough-tutorial-on-complex-models-changed-in-dropdown/11147>\
**Category:** Uncategorized\
**Created:** [July 13, 2016, 10:13am UTC](https://discuss.emberjs.com/t/looking-for-walkthrough-tutorial-on-complex-models-changed-in-dropdown/11147 "2016-07-13T10:13:56Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![niconel](https://avatars.discourse-cdn.com/v4/letter/n/e480ec/32.png) [@niconel](https://discuss.emberjs.com/u/niconel)\
**Post date:** [July 13, 2016, 10:13am UTC](https://discuss.emberjs.com/t/looking-for-walkthrough-tutorial-on-complex-models-changed-in-dropdown/11147/1 "2016-07-13T10:13:56Z")

</div>

Seems one thing I cannot get right is when I have a complex model (say “vehicle” that has a “model” property which is a separate model)

What I’m trying to do is have a drop down in the template, listing all models, and have the current model (if any) selected, which I get right.

But when the user selects a different model and save, the vehicle’s model property is always null.

For what it matter I can save “simple” or “flat” models just fine.

Seems none of the books I tackled so far address this unless I’ve been a retard and misunderstand the whole concept. (which is most likely the case!)

---

<div class="post-metadata">

**Author:** ![niconel](https://avatars.discourse-cdn.com/v4/letter/n/e480ec/32.png) [@niconel](https://discuss.emberjs.com/u/niconel)\
**Post date:** [July 14, 2016, 8:10am UTC](https://discuss.emberjs.com/t/looking-for-walkthrough-tutorial-on-complex-models-changed-in-dropdown/11147/2 "2016-07-14T08:10:53Z")

</div>

It’s cool. Think on the right track now.

For whoever land on this in the future: While YoEmber and R&Roll with EmberJs is great, Ember CLI 101, while much shorter covers this in its examples and explanations.

Now…do the book all over again to really UNDERSTAND…