Lumen: In routes.php line 17: Call to undefined method Laravel\Lumen\Application::post(), after upgrade to 5.5.*

Question

I am working in project where I need to upgrade the Lumer version from 5.1.* to 7.*.

But I have been stuck at the versions 5.4.* and 5.5.* . Where in 5.4.* when I ran the built-in php server php -S localhost:8000 -t./public and visited the URL http:\\localhost:8000 , I got the below error:

Call to undefined method ...\Application->welcome()

But I upgraded to next version hoping that would solve this issue, as I hadn't changed any of files outside vendor folder.

But after I upgraded to Lumen 5.5.* version, and now when I run any php artisan command, I am getting below error:

In routes.php line 17:
  Call to undefined method Laravel\Lumen\Application::post()

Can anyone share idea on what's wrong and how to fix both the aforementioned errors?

This is composer.json file of project, just in case it helps:

{
    "name": "laravel/lumen",
    "description": "The Laravel Lumen Framework.",
    "keywords": ["framework", "laravel", "lumen"],
    "license": "MIT",
    "type": "project",
    "require": {
        "php": ">=5.5.9",
        "laravel/lumen-framework": "5.5.*",
        "vlucas/phpdotenv": "~2.2"
    },
    "require-dev": {
        "phpunit/phpunit": "~4.0"
    },
    "autoload": {
        "psr-4": {
            "App\\": "app/"
        },
        "classmap": [
            "database/"
        ]
    },
    "autoload-dev": {
        "classmap": [
            "tests/"
        ]
    },
    "config": {
        "preferred-install": "dist"
    }
}

app/Http/routes.php:

<?php
    date_default_timezone_set('America/Chicago');
/*
|--------------------------------------------------------------------------
| Application Routes
|--------------------------------------------------------------------------
|
| Here is where you can register all of the routes for an application.
| It's a breeze. Simply tell Laravel the URIs it should respond to
| and give it the controller to call when that URI is requested.
|
*/


//$app->group(['middleware' => 'FilterInput'], function($app) {

    $app->post('app_details', ['as' => 'app_details', 'uses' => 'App\Http\Controllers\Details@set_app_details']);
    $app->post('phone_details', ['as' => 'phone_details', 'uses' => 'App\Http\Controllers\Details@set_phone_details']);
    $app->post('app_search', ['as' => 'from_search', 'uses' => 'App\Http\Controllers\Details@set_search_details']);
    $app->post('app_lead', ['as' => 'from_search', 'uses' => 'App\Http\Controllers\Details@set_lead_details']);
    $app->post('survey', ['as' => 'survey', 'uses' => 'App\Http\Controllers\Survey@set_data']);


    //capture all routes regardless
    $app->get('{path:.*}', function() use ($app) {
        return $app->welcome();
    });

//});

bootstrap/app.php excerpt:

...
...
require __DIR__.'/../app/Http/routes.php';

return $app;

Answer 1

As you may see here $app is no longer used - instead you use $router .

$router->get('/', function () use ($router) {
    return $router->app->version();
});

The previous version was like this

After updating the routes by replacing $app with $router ; the bootstrap/app.php becomes like this

$app->router->group(['namespace' => 'App\Http\Controllers'], function ($router) {
    require __DIR__ . '/../app/Http/routes.php';
});