如何在 Laravel 中将 3 个表与 eloquent 组合

Question

How to combine 3 tables with eloquent inaravel?

Hi Whomever help me, I need your help.

How do you combine the following three tables with eloquent in laravel?

The following table structure and figures:

Tag table structure {tag_id: primary key, tag_name, tag_category}

Article table structure {article_id: primary key, date_posting, content, tag_id: foreign key}

Review table structure {review_id: primary key, date_review, reviewer_name, review_content, article_id: foreign key}

structure table

Can you give me sample source code for view.blade, controller and model.

Thank you very helpful answer:)

Answer 1

From your image

Tag are are having articles and articles are having reveiw

Now Tag shares a one-to-many andmany-to-one(inverse) relationship with Article

use App\Article;

class Tag extends Model{
    public function articles()
    {
        return $this->hasMany(Article::class);
    }
}

Article model

use App\Tag;
use App\Review;

class Article extends Model{
    //Inverse relation for Tag and Article  
    public function tag()
    {
        return $this->belongsTo(Tag::class);
    }

   //Articles having reviews
   public function reviews()
   {
       return $this->hasMany(Review::class);
   }
}

In Review model

use App\Article;

class Review extends Model {
    public function article()
    {
        return $this->belongsTo(Article::clas);
    }

}

Now you can retrieve all models data using eager loading

App\Tag::with('articles.reviews')->get()