Laravel 9 pass variable from route to controller - php

Question

My problem:
I am currently trying to refactor some of my controllers. Doing so I found these two routes:
Route::get('/events', [EventsController::class, 'eventsList'])->name('event-list');
Route::get('/courses', [EventsController::class, 'allCoursesList'])->name('all-events');
they show different filter options in the frontend.
What I want to do:
Example Code:
Route::get('/courses', [
'all' => 1,
EventsController::class, 'courseList'
])->name('all-events');
so having the ability to pass a variable, in this case all to my controller. EventsController So I can check with if in my controller and handle these routes differently with only one function instead of two.
With the current solutions on StackOverflow, users are using:
'uses'=>'myController#index'
now if I try it like this:
Route::get('/courses', [
'all' => 1,
'uses' => 'EventsController#CourseList'
])->name('all-events');
I get the following error:
Target class [EventsController] does not exist.
Question:
What is the current, correct way, to pass a variable to a controller, from a route. In Laravel 9 and 10.

Answer 1

You can pass arbitrary data to the route as a parameter using the defaults method of Route:
Route::get('courses', [EventsController::class, 'list'])
->name('all-events')
->defaults('all', 1);
Route::get('events', [EventsController::class, 'list'])
->name('event-list');
public function list(Request $request, $all = 0)
{
...
}
There are also other ways of using the Route to pass data.

Answer 2

Laravel versions 8 and above do not automatically apply namespace prefixes. This means that when passing the class name as a string, you need to use the fully qualified class name (FQCN).
For example:
Route::get('/courses', [
'all' => 1,
'uses' => '\App\Http\Controllers\EventsController#CourseList'
])->name('all-events');
If it makes sense for your use case, you could also use URL parameters. For example, if your Course models belong to a Category model, you might do something like this:
Route::get('/courses/{category}', [EventsController::class, 'allCourseList');
Then in your countroller, you define the allCoursesList function like so:
public function allCoursesList(Category $category)
{
// ... do something with $category which is an instance of the Category model.
}

Answer 3

You can use Route Parameters to pass variable from route to controller.
// web.php
Route::get('/events/{all}', [EventsController::class, 'eventsList'])->name('event-list');
then in your controller you can access the variables
public function eventsList(Request $request,$all){
if($all==1){
//your logic for handling the condition when $all =1
}
// the remaining condition
}
if you have multiple parameters you can pass them like so, you can use ? for optional parameter.
// web.php
Route::get('/courses/{param_one}/{param_two?}', [EventsController::class, 'allCoursesList'])->name('all-events');
then in your controller you can access the variables
public function allCoursesList(Request $request,$paramOne,$paramTwo){
return $paramOne.' '.$paramTwo;
}
to access the query parameter
// web.php
Route::get('/evets', [EventsController::class, 'allCoursesList'])->name('all-events');
if the route were /events?timeframe=0&category=1 you can access the query parameter like so
public function allCoursesList(Request $request,$paramOne,$paramTwo){
$timeframe= $request->query('timeframe');
// do this for all the query parameters
}