Php Laravel 5.2未定义的变量主题

我正在制作一个论坛，如果用户点击一个主题，他会被重定向到所有属于该主题的主题所在的页面。我想做的是，用户能够点击主题并重定向到它

问题是，我得到一个错误，说

未定义变量：theme

---

正如您在下面的代码中所看到的，我在

theme.blade.php

中有一个foreach循环，它循环属于他/她单击的主题的所有主题。在循环的开头有一个

我不知道你是否可以使用double'->with'选项

以下是有效的方法：

return view('topics/topic', ['topics' => $topics, 'theme'=> $theme]);

传递数组作为视图的第二个参数。您可以添加任意数量的键和变量

Route::get('/', 'ThemesController@index')->name('home');
Route::get('/theme/{theme_id}/topics', 'ThemesController@show')->name('showtheme');


Route::get('/theme/{theme_id}/topics/{topic_id}', 'TopicsController@topic')->name('showtopic');


Route::group(['middleware' => 'App\Http\Middleware\AdminMiddleware'], function() {

//THEMES

Route::get('/theme/{theme_id}/edit', 'ThemesController@edit')->name('edittheme');
Route::patch('/theme/{theme_id}/edit', 'ThemesController@update')->name('updatetheme');

Route::get('/theme/create', 'ThemesController@create')->name('createtheme');
Route::post('/theme/create', 'ThemesController@save')->name('savetheme');

Route::delete('/theme/{theme_id}/delete', 'ThemesController@destroy')->name('deletetheme');

//TOPICS

Route::get('/theme/{theme_id}/topics/{topic_id}/edit', 'TopicsController@edit')->name('edittopic');
Route::patch('/theme/{theme_id}/topics/{topic_id}/edit', 'TopicsController@update')->name('updatetopic');

Route::get('/theme/{theme_id}/topics/create', 'TopicsController@create')->name('createtopic');
Route::post('/theme/{theme_id}/topics/create', 'TopicsController@save')->name('savetopic');

Route::delete('/theme/{theme_id}/topics/{topic_id}/delete', 'TopicsController@destroy')->name('deletetopic');

});

Route::get('user/profile', 'UserController@profile')->name('showprofile');
Route::post('user/profile', 'UserController@update_avatar');

public function show($id)
{
    $theme = Theme::find($id);
    $topics = Topic::find($id);

    return view('topics/topic')->with('topics', $topics)->with('theme', $theme);
}

return view('topics/topic', ['topics' => $topics, 'theme'=> $theme]);