Fetch class methods from an extended class from within a used Trait - php

Question

I have a trait AutomatedEmails with a submit function, part of which features the below:
AutomatedEmails.php (Trait):
trait AutomatedEmails
{
/** Initial route function the form is posted to */
public function submit(Request $request)
{
$slug = $request->slug;
// Fetch the action function required and load (from AutomatedEmailsController file)
// The function must exactly match the slug in the automated_emails_actions table
// with underscores rather than hyphens
if (!method_exists($this, str_replace('-', '_', $slug)))
return redirect()->to($request->redirectUrl)->with('danger', App::environment('local') ? 'Form processing function not set up for this form' : $liveProcessingError);
// THE LINE ABOVE IS THE PROBLEM LINE - THE METHOD DOES NOT EXIST
}
I have a class which is also part of this package which contains form processing methods:
AutomatedEmailsController.php:
class AutomatedEmailsController extends Controller
{
use AutomatedEmails;
public $fillables = [];
public $appends = [];
public $tracking_data = [];
public $action;
public $thank_you = ['message' => 'Thank you - your enquiry has been received'];
public function contact_enquiry(Request $request = null)
{
// method implementation
}
}
I then want to create a class extension on the local project but make these methods available to the Trait (and this is where the the problem lies):
AutomatedEmailsControllerExtension.php:
class AutomatedEmailsControllerExtension extends AutomatedEmailsController
{
use AutomatedEmails;
public function vehicle_enquiry(Request $request = null)
{
// method implementation
}
}
Here is the new form example:
<form method="post" name="vehicle_enquiry" action="{{route('automated-email', ['slug' => 'vehicle_enquiry'])}}">
<input type="hidden" name="vehicle_id" value="{{$vehicle->id}}">
<-- Additional inputs here -->
</form>
And this is the route method in web.php:
Route::post('/automated-enquiry', 'AutomatedEmailsControllerExtension#submit')->name('automated-email');
The purpose of this class is to add functions that pass through data about a new form that should be processed.
The problem is that the vehicle_enquiry method cannot be found on the AutomatedEmails.php Trait and therefore the form will not get processed as required.
What I am planning to do is suggest a file for the Trait to search for an instantiate methods from that file.

Answer 1

It is entirely possible to refer to methods defined in composited classes from a trait (or from a parent class to methods on children classes).
See this, for example:
trait Foo {
public function g($method = 'zbar') {
if (method_exists($this, $method)) {
echo call_user_func([$this, $method]), "\n";
}
else {
echo "we not good";
}
}
}
class Bar {
use Foo;
protected function zbar() {
return 'abc';
}
}
class SuperBar extends Bar {
protected function xbar() {
return 'edf';
}
}
$a = new Bar();
$a->g('zbar');
$b = new SuperBar();
$b->g('xbar');
This outputs:
abc
edf
You can see it working here.
In your case, it looks like your code is not going through AutomatedEmailsControllerExtension at all. To make sure, you can put a die(class_name($this)); statement on submit().
If you are not hitting that class, it could be because of Laravel's caching getting in the way. Clear cache and you will be good to go.
Additionally, since AutomatedEmailsControllerExtension extends on AutomatedEmailsController, there is no need to use the trait again. If it's used on the parent, the methods are already available on the children.