创建类别并重定向到 category.index 后，在 laravel 中找不到基表或视图

Posted 2023-03-15

【中文标题】创建类别并重定向到 category.index 后，在 laravel 中找不到基表或视图

【英文标题】：base table or view not found in laravel after create category and redirect to category.index

【发布时间】：2018-12-01 04:30:21

【问题描述】：

我在创建类别时遇到问题。 在我将类别关系更改为多对多之前我没有问题。

当我发布新类别并重定向到类别列表页面后，我收到此错误：

SQLSTATE[42S02]：未找到基表或视图：1146 表“myblog.category_post”不存在（SQL：选择posts.*、category_post.category_id 作为pivot_category_id、@987654325 @.post_id as pivot_post_id from posts inner join category_post on posts.id = category_post.post_id where category_post.category_id = 1（查看） \Users\M0RT3Z4\Desktop\MyBlog\resources\views\admin\category\index.blade.php)

但类别插入到数据库中。如果记录插入到类别表中，类别列表将不会显示，我会得到错误。

后模型：

命名空间 App\Models;

使用 Cviebrock\EloquentSluggable\Sluggable; 使用 Illuminate\Database\Eloquent\Model;

class Post extends Model

    use Sluggable;
    protected $fillable = [
        'title', 'body', 'views', 'category_id', 'user_id'
    ];

    public function comment()
    
        $this->hasMany(Comment::class);
    

    public function category()
    
        return $this->belongsToMany(Category::class);
    

    public function tags()
    
        return $this->belongsToMany(Tag::class);
    

    /**
     * Return the sluggable configuration array for this model.
     *
     * @return array
     */
    public function sluggable(): array
    
        return [
            'slug' => [
                'source' => 'title'
            ]
        ];
    

    public function hastags($id)
    
        return in_array($id, $this->tags()->pluck('id')->toArray());
    

    public function hascategories($id)
    
        return in_array($id,$this->category()->pluck('id')->toArray());
    

类别模型：

<?php

namespace App\Models;

use Cviebrock\EloquentSluggable\Sluggable;
use Illuminate\Database\Eloquent\Model;

class Category extends Model

    use Sluggable;
    protected $fillable = [
        'name','slug'
    ];

    public function post()
    
        return $this->belongsToMany(Post::class);
    

    /**
     * Return the sluggable configuration array for this model.
     *
     * @return array
     */
    public function sluggable(): array
    
        return [
            'slug' => [
                'source' => 'name'
            ]
        ];
    

类别控制器：

    <?php

namespace App\Http\Controllers\Admin;

use App\Models\Category;
use App\Models\Post;
use Illuminate\Http\Request;
use App\Http\Controllers\Controller;
use Illuminate\Support\Facades\Session;

class CategoryController extends Controller

    public function index()
    
        $post = Post::all();
        $cats = Category::orderBy('id','DESC')->paginate(10);
        return view('admin.category.index',compact(['cats','post']));
    

    public function create()
    
        return view('admin.category.create');
    

    public function show(Category $category)
    
        return view('admin.category.show',compact('category'));
    

    public function store(Request $request)
    
        $this->validate($request, [
            'name' => 'required|min:3|unique:categories',
        ]);

        $cat = new Category();
        $cat->name = $request->name;
        $cat->slug = $request->slug;
        $cat->save();

        Session::flash('success','Category Created Successfully');

        return redirect()->route('admin.category.index');
    

    public function edit(Category $category)
    
        return view('admin.category.edit',compact('category'));
    

    public function update(Category $category,Request $request)
    
        $this->validate($request, [
            'name' => 'required|min:3|unique:categories',
        ]);

        $category->name = $request->name;
        $category->save();

        Session::flash('update','Category Updated Successfully');

        return redirect()->route('admin.category.index');
    

    public function destroy(Category $category)
    
        $category->delete();

        Session::flash('delete','Category Deleted Successfully');

        return redirect()->route('admin.category.index');
    

类别迁移：

<?php

use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class CreateCategoriesTable extends Migration

    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    
        Schema::create('categories', function (Blueprint $table) 
            $table->increments('id');
            $table->string('name');
            $table->string('slug');
            $table->timestamps();
        );
    

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    
        Schema::dropIfExists('categories');
    

post_category 迁移

<?php

use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class CreatePostCategory extends Migration

    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    
        Schema::create('post_category', function (Blueprint $table) 
            $table->unsignedInteger('post_id');
            $table->unsignedInteger('category_id');
            $table->foreign('post_id')->on('posts')->references('id')->onUpdate('cascade')->onDelete('cascade');
            $table->foreign('category_id')->on('categories')->references('id')->onUpdate('cascade')->onDelete('cascade');
            $table->unique(['post_id', 'category_id']);
        );
    

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    
        Schema::dropIfExists('post_category');
    

发布迁移

<?php

use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class CreatePostsTable extends Migration

    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    
        Schema::create('posts', function (Blueprint $table) 
            $table->increments('id');
            $table->string('title')->unique();
            $table->string('slug')->unique()->nullable();
            $table->text('body');
            $table->string('image')->nullable();
            $table->unsignedInteger('views')->default(0);
            $table->unsignedInteger('category_id')->nullable();
            $table->timestamps();
        );
    

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    
        Schema::dropIfExists('posts');
    

【参考方案1】：

您应该使用迁移命名约定的最佳实践来避免此问题

将create_post_category 重命名为category_post（按字母顺序）

或者您可以在 $this->belongsToMany(Category::class,'category_post') 中为数据透视表和键指定其他参数

【讨论】：

我已经更新了答案以包含数据透视表，试试吧，如果它不起作用，那么请确保您运行 php artisan migrate