How to pass data from routes group to its controllers?

Question

I have a routes group in Laravel that gets a parameter like below:

Route::group(['prefix' => '{ProjectCode}'], function () {
    Route::get('/categories', 'CategoriesController@Categories');
    Route::get('/add-category', 'CategoriesController@AddCategory');
});    

The ProjectCode is an id, that is used to get some data from the database I want to pass the retrieved data to controllers that they are in sub of the route group and avoid getting data in every function in controller

Answer 1

You may use "Implicit/Explicit Route Model Binding", assuming you have Project model, you can have this controller method (use camelCase for parameters and controllers' methods name not PascalCase):

Route::group(['prefix' => '{projectCode}'], function () {
    Route::get('/categories', 'CategoriesController@pategories');
    Route::get('/add-category', 'CategoriesController@addCategory');
});  

class CategoriesController extends Controller
{
    /**
     * Display a listing of the resource.
     *
     * @param  Request  $request
     * @return \Illuminate\Http\Response
     */
    public function categories(\App\Project $projectCode)
    {
        //
    }
}

You may wish to use your own resolution binding, override the resolveRouteBinding on your model:

/**
* Retrieve the model for a bound value.
 *
 * @param  mixed  $value
 * @param  string|null  $field
 * @return \Illuminate\Database\Eloquent\Model|null
 */
public function resolveRouteBinding($value, $field = null)
{
    return $this->where($field ?? $this->getRouteKeyName(), $value)->first();
}

See Laravel docs for more info.