$casts, array data - php

Question

I'm using $casts to save data in array to database. I have an issue with that.
How can i push data to an existing array in the database?
For example i have already an array of data in my db column like: ["some_data", "another_el"] and so on and in the Controller i want to push in this array in db some other data from input.
$brand = Brand::find($request->input('brand'));
$brand->model = $request->input('model');
$brand->update();
Pushing data like this.

Answer 1

You cannot do this with Eloquent's Mass Assignment functions (update, create, etc). You must pull down your field, change it, then save the model.
$collection = collect($brand->field);
$collection->push($myNewData);
$brand->field = $collection->toJson();
$brand->save();

Answer 2

Way 1
$brand = Brand::find($request->input('brand'));
$brand->model = array_merge($brand->model, [$request->input('model')]);
$brand->update();
Way 2 (my favorite because it encapsulates the logic)
$brand = Brand::find($request->input('brand'));
$brand->addModel($request->input('model'));
$brand->update();
And on Entity:
public function addModel($value)
{
$this->model = array_merge($this->model, [$value]);
}
Optional
And on Entity (instead $casts):
public function setModelAttribute($value)
{
$this->attributes['model'] = json_encode($value);
}
public function getModelAttribute($value)
{
return json_decode($value, true);
}