In Cake 2 you could save a model and specify which fields you wanted to restrict the save to.

Is there a built-in way to do this simply in Cake 3? For example, if the request data is being put straight into a new entity which is then saved, how can I tell the method to only save the fields I allow?

**Simplified Example**

```
// User makes a request; their POST data goes directly into the entity
$customer = $this->Customers->newEntity($this->request->data);
$this->Customers->save($customer);

```

The obvious danger here is that I can set any properties I like on that customer entity, via the request. In reality, I only want to allowing saving of a couple of specific fields.