Laravel Voyager：BelongsToMany

Question

我有一本书桌和作者。我希望能够将作者与书籍联系起来。我调整了BREAD的书籍：

通过这些设置，我可以单击编辑并为我的书选择作者，但是当我尝试保存书籍时，laravel会发出以下错误：

 SQLSTATE[HY000]: General error: 1366 Incorrect integer value: 'Mrs. Alivia 
 Stanton IV' for column 'authors_id' at row 1 (SQL: insert into 
 `authors_books` (`authors_id`, `books_id`) values (Mrs. Alivia Stanton IV, 
 55))

这是合乎逻辑的。但是当我将name切换到id时，laravel发出了这个错误：

 SQLSTATE[23000]: Integrity constraint violation: 1052 Column 'id' in field 
 list is ambiguous (SQL: select `id` from `authors` inner join 
 `authors_books` on `authors`.`id` = `authors_books`.`authors_id` where 
  `authors_books`.`books_id` = 57) (View: 

我尝试使用所有组合，但什么也没发生。

型号书籍：

class Books extends Model
{   
protected $fillable = ['name','img'];

public function authors()
{
    return $this->belongsToMany('App\Authors');
}

public function getImgAttribute($img)
{   
    if(!empty($img)){
        return 'storage/images/books/'.$img;
    }else{
        return 'storage/images/books/not-found.jpg';
    }
}

 }

模特作者：

class Authors extends Model
 {

protected $fillable = ['name','img'];

public function books()
{
    return $this->belongsToMany('App\Books');
}

public function getImgAttribute($img)
{   
    if(!empty($img)){
        return 'storage/images/authors/'.$img;
    }else{
        return 'storage/images/books/not-found.jpg';
    }
}
}

请帮忙！

Answer 1

型号书籍：

class Books extends Model
{   
protected $fillable = ['name','img'];

public function authors()
{
    return $this->belongsToMany('App\Author','Pivot table');
}

public function getImgAttribute($img)
{   
    if(!empty($img)){
        return 'storage/images/books/'.$img;
    }else{
        return 'storage/images/books/not-found.jpg';
    }
}

 }

模特作者：

class Authors extends Model
 {

protected $fillable = ['name','img'];

public function books()
{
    return $this->belongsToMany('App\Book,'Pivot table');
}

public function getImgAttribute($img)
{   
    if(!empty($img)){
        return 'storage/images/authors/'.$img;
    }else{
        return 'storage/images/books/not-found.jpg';
    }
}
}

请阅读本文档以便更好地理解http://laraveldaily.com/pivot-tables-and-many-to-many-relationships/