Automatic status on 2 models

I am stuck since 2 days on a problem that I haven’t think before.

To be simple, I manage 3 models (Motorbike, Revision, Training).

If a motorbike is in revision or in training, I have to see on my form Motorbike that the moto is unavailable.

Example:

There are a training on 10/08/2019 with the motorbike 00004.

In my form Motorbike, the status has changed in unavailable for the motorbike 000004.

Well !

Now, my problem is in my form Revision, if I add a revision for the motorbike 000002

the status has to change in my form Motorbike also. Here the status has not changed...

In my Controller Motorbike I have this:

public function index()
    {
        $motorbikes =…