Attempt to read property "title" on null

when I enter the detail page in Laravel, it gives an error. I don't understand where the error is coming from. My codes are as follows. where is the problem? actually it says it's empty, but it needs to pull data from $blog on controller side.

Controller:

public function show($id)
{
    $blog = Blog::where('id',$id)->first();

    return view('front.detail',compact('blog'));
}

routes/web.php:

Route::prefix('{lang?}')->middleware('locale')->group(function() {

    Route::get('/', [MainController::class, 'index'])->name('home');
    Route::get('/about', [MainController::class, 'about'])->name('about');
    Route::resource('/blogs', MainController::class)->only([ 'show']);
});

detail.blade.php:

<li>
    <h2><a href="">{{$blog->title}}</a></h2>
      <p>{!! $blog->text !!}</p>
</li>

CodePudding user response：

If you want to get a model by the main column you use find not where and the column:

public function show($id)
{
    $blog = Blog::find($id);

    return view('front.detail',compact('blog'));
}

Then, find can return the Model (hence an object) or null, so in your case it is not finding the model by ID.

What you should use is findOrFail so it throws an exception if it did not find the model:

public function show($id)
{
    $blog = Blog::findOrFail($id);

    return view('front.detail',compact('blog'));
}

Then you can continue debugging why it is not found

CodePudding user response：

Doesn't appear you are passing the blog ID in with your URL:

Route::resource('/blogs', MainController::class)->only([ 'show']);

Try changing your route to this:

Route::resource('/blogs/{id}', MainController::class)->only([ 'show']);

Your URL should be something like (where 5 is the blog ID):

http://yourdomain.com/blogs/5

You could also use binding:

// Route
Route::get('/blogs/{blog}', [MainController::class, 'show']);

public function show(Blog $blog)
{
    return view('front.detail', ['blog' => $blog]);
}

More info can be found here: Route model binding

CodePudding user response：

When I use this code, it redirects to 404 page.

public function show($id)
{
    $blog = Blog::find($id);

    return view('front.detail',compact('blog'));
}

When I use this code, it redirects to 404 page.

public function show($id)
{
    $blog = Blog::findOrFail($id);

    return view('front.detail',compact('blog'));
}