错误：未定义变量：项目（视图：../resources/views/project.blade.php）

Question

I am trying to return a view when i go to (for instance) /project/2 but i get the following error:

Undefined variable: projects (View: ../resources/views/project.blade.php)

Keep in mind that i'm pretty new to development and Laravel . I'm using Laravel 5.2 .

This is my controller:

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\Project;
use App\Http\Controllers\Controller;

class pagesController extends Controller {
  public function index() {
    $projects = \App\Project::orderBy('created_at', 'desc')->get();
    return view('index')->with('projects', $projects);
  }

  public function storeProject(Request $request) {
    $project = new Project;
    $project->name = $request->newProject;
    $project->save();
  }

  public function getProject($id) {
    $project = \App\Project::findorfail($id); //findorfail 404 teruggeven wanneer id null is.
    return view('project')->with('project', $project);
  }
}

My form:

<!-- Begin nieuw project formulier-->
<div class="dropdown-container">
  <div class="text-center dropdownwrap">
    <form role="form" method="POST" action="/project/">
      <div class="form-group">
        <input name="newProject" type="text" class="form-control" id="newProjectField" placeholder="Voeg project toe..."/>
      </div>
      <div class="form-group text-center">
        <button type="submit" class="btn btn-primary">
          Bewaar
        </button>
      </div>
    </form>
  </div>
  <a href="#" class="btn btn-default btn-block dropdownButton"><span class="glyphicon glyphicon-plus"></span></a>
</div>
<!-- Einde Nieuw project formulier-->

My routes:

<?php

/*
|--------------------------------------------------------------------------
| Routes File
|--------------------------------------------------------------------------
|
| Here is where you will register all of the routes in 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.
|
*/

Route::get('/', 'pagesController@index');

Route::get('/test', function() {
  return view('testPage');
}
);

Route::post('/', 'pagesController@storeProject');

Route::post('/project', 'pagesController@storeProject');
Route::get('/project/{id}', 'pagesController@getProject');

/*
|--------------------------------------------------------------------------
| Application Routes
|--------------------------------------------------------------------------
|
| This route group applies the "web" middleware group to every route
| it contains. The "web" middleware group is defined in your HTTP
| kernel and includes session state, CSRF protection, and more.
|
*/

Route::group(['middleware' => ['web']], function () {
    //
});

Answer 1

According to your route URI project/2 you trigger the following method:

public function getProject($id)
{
    $project = \App\Project::findorfail($id); //findorfail 404 teruggeven wanneer id null is.
    return view('project')->with('project', $project);

}

In this case, you've used project not projects so the variable $projects will not be available, instead use $project . To be more clear, when you write )->with('project', $project); you meant that, the first argument in the with method would be the variable name to access the data passed in the second parameter and in your case, you've used with('project', $project) . So it works just like this:

return view('project')->with(
    'project', // <-- This will be available in the view as $project
    $project // <-- This will be contained in the $project variable in the view
);