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                            當前是BPost表模型：
```
<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use \App\Models\Model;

class BPost extends Model
{
    use HasFactory;

    protected $table = "b_posts";

    /*
     * BPost表文章用戶id對應的用戶數據
     */
    public function bUser()
    {
        return $this->belongsTo('App\Models\BUser', 'b_user_id', 'id');
    }

    /*
     * 當前文章的所有分類
     */
    public function categories()
    {
        return $this->belongsToMany(\App\Models\BPostCategory::class, 'b_post_category_relationships', 'b_post_id', 'b_category_id');

        // return $this->belongsToMany(\App\Models\BPostCategory::class, 'b_post_category_relationships', 'b_post_id', 'b_category_id')->withPivot(['b_post_id', 'b_category_id']);
    }

    /*
     * 文章是否有分類
     */
    public function hascategory($category)
    {
        return $this->categories->contains($category);
    }
}

```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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