已解决：调用未定义的方法 App\Category::posts() Laravel

Question

我想用 laravel 创建一些 CMS 项目，当用户尝试单击类别时，应用程序将显示仅显示用户单击的类别的帖子。 当用户单击类别时，应用程序会显示错误错误方法调用。 我应该怎么办？ 任何帮助将不胜感激。

这是来自 web.php 的代码

<?php

use App\Http\Controllers\Blog\PostsController;
use Illuminate\Support\Facades\Route;

/*
|--------------------------------------------------------------------------
| Web Routes
|--------------------------------------------------------------------------
|
| Here is where you can register web routes for your application. These
| routes are loaded by the RouteServiceProvider within a group which
| contains the "web" middleware group. Now create something great!
|
*/

Route::get('/', 'WelcomeController@index')->name('welcome');
Route::get('blog/posts/{post}', [PostsController::class, 'show'])->name('blog.show');
Route::get('blog/categories/{category}', [PostsController::class, 'category'])->name('blog.category');
Route::get('blog/tags/{tag}', [PostsController::class, 'tag'])->name('blog.tag');

Auth::routes();

Route::middleware(['auth'])->group(function () {
    Route::get('/home', 'HomeController@index')->name('home');
    Route::resource('categories', 'CategoriesController');
    Route::resource('posts','PostsController');
    Route::resource('tags','TagsController');
    Route::get('trashed-posts','PostsController@trashed')->name('trashed-posts.index');
    Route::put('restore-post/{post}', 'PostsController@restore')->name('restore-posts');
});

Route::middleware(['auth', 'admin'])->group(function () {
    Route::get('users/profile', 'UserController@edit')->name('users.edit-profile');
    Route::put('users/profile', 'UserController@update')->name('users.update-profile');
    Route::get('users','UserController@index')->name('users.index');
    Route::post('users/{user}/make-admin', 'UserController@makeAdmin')->name('users.make-admin');
});

这是 PostsController.php 的代码

<?php

namespace App\Http\Controllers\Blog;

use App\Http\Controllers\Controller;
use App\Post;
use Illuminate\Http\Request;
use App\Tag;
use App\Category;


class PostsController extends Controller
{
    public function show(Post $post) {
        return view('blog.show')->with('post', $post);
    }

    public function category(Category $category) {
        return view('blog.category')
        ->with('category', $category)
        ->with('posts', $category->posts()->simplePaginate())
        ->with('categories', Category::all())
        ->with('tags', Tag::all());
    }

    public function tag(Tag $tag) {
        return view('blog.tag')
        ->with('tag', $tag)
        ->with('posts', $tag->posts()->simplePaginate(3));
    }
}

这是来自 App\Category.php 的代码

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Category extends Model
{
   protected $fillable = ['name'];

   public function post() {
      return $this->hasMany(Post::class);
   }
}

这是来自 category.blade.php 的代码

@extends('layouts.blog')


@section('title')
Category {{ $category->name }}
@endsection

@section('header')
<header class="header text-center text-white" style="background-image: linear-gradient(-225deg, #5D9FFF 0%, #B8DCFF 48%, #6BBBFF 100%);">
    <div class="container">

      <div class="row">
        <div class="col-md-8 mx-auto">

          <h1>{{ $category->name }}</h1>
          <p class="lead-2 opacity-90 mt-6">Read and get updated on how we progress</p>

        </div>
      </div>

    </div>
  </header><!-- /.header -->
@endsection

@section('content')
  <main class="main-content">
    <div class="section bg-gray">
      <div class="container">
        <div class="row">


          <div class="col-md-8 col-xl-9">
            <div class="row gap-y">

              @forelse($posts as $post)
                  <div class="col-md-6">
                      <div class="card border hover-shadow-6 mb-6 d-block">
                        <a href="{{ route('blog.show',$post->id) }}"><img class="card-img-top" src="{{ asset($post->image) }}" alt="Card image cap"></a>
                        <div class="p-6 text-center">
                          <p>
                              <a class="small-5 text-lighter text-uppercase ls-2 fw-400" href="#"></a>
                                  {{ $post->category->name }}
                              </p>
                          <h5 class="mb-0">
                              <a class="text-dark" href="{{ route('blog.show',$post->id) }}">
                                  {{ $post->title }}
                              </a>
                          </h5>
                        </div>
                      </div>
                    </div>
                    @empty
                    <p class="text-center">
                    No Results found for query   <strong>{{ request()->query('search') }} </strong>
                </p>
                    @endforelse
            </div>


            {{-- <nav class="flexbox mt-30">
              <a class="btn btn-white disabled"><i class="ti-arrow-left fs-9 mr-4"></i> Newer</a>
              <a class="btn btn-white" href="#">Older <i class="ti-arrow-right fs-9 ml-4"></i></a>
            </nav> --}}
            {{ $posts->appends(['search' => request()->query('search') ])->links() }}

          </div>

          @include('partials.sidebar')

        </div>
      </div>
    </div>
  </main>
@endsection

如果你们没有看到我没有显示的文件，请问。 如果你们发现任何令人困惑的问题，我可以使用 teamviewer。 任何帮助将不胜感激。 谢谢你。

Answer 1

错误告诉你没有posts 。 它的确是。 您所拥有的是Category class 上的post()方法，如这一行所示：

public function post() {

您应该将->with('posts', $category->posts()->simplePaginate())更改为：

public function category(Category $category) {
    return view('blog.category')
    ->with('category', $category)
    ->with('posts', $category->post()->simplePaginate())
    ->with('categories', Category::all())
    ->with('tags', Tag::all());
}

Answer 2

在您的 model 中，您定义了一个post关系，而您使用的是posts关系，它们不是同一个。 您应该逐个posts替换post ，因为它是一对多的关系。

Answer 3

您的关系是post并且您有多个->with('posts', $category->posts()->simplePaginate()) 。 您可以将它们更改为->with('post')并重试吗？