How to incorporate ->isDirty() with laravel ->update() - php

Question

I want to check if certain columns in database are changed.
the update code in my controller goes like this:
$tCustomer = TCustomer::withTrashed()->findOrFail($id);
$tCustomer->update(request()->all());
How do I incorporate it with the ->isDirty() function?
I tried adding it after $tCustomer->update(request()->all()); but it always returns false:
$dirty = $tCustomer->getDirty('payment_method_id');
do I have to add isDirty() before or right after the update?

Answer 1

You can uuse fill() instead of update(), check for isDirty(), then save(). This way you can take advantage of the mass injectable fields.
$myModel->fill($arrayLikeinUpdate);
if ($myModel->isDirty()) {
// do something
}
$myModel->save();

Answer 2

You have to use observers, you can use updating() eloquent model event for before saving the model or updated() after saving model, you just have to add below code in your TCustomer model:
public static function boot(){
static::updated(function($tCustomer){
if($tCustomer->isDirty('field_name')){
//This code will run only after model save and field_name is updated, You can do whatever you want like triggering event etc.
}
}
static::updating(function($tCustomer){
if($tCustomer->isDirty('field_name')){
//This code will run only before saving model and field_name is updating, You can do whatever you want like triggering event etc.
}
}

Answer 3

isDirty returns a bool, so you'd use it with a conditional to check if a given models attributes have changed. Example:
// modify an attribute
$myModel->foo = 'some new value';
....
// do other stuff
...
// before the model has been saved
if ($myModel->isDirty()) {
// update model
$myModel->save();
}
So the check needs to be done before you update (save) the model.
Calling update saves the model with the given attributes in one call so you wouldn't use isDirty in that context.