调用未定义函数 App\belongsToMany [Laravel]

Question

我收到的错误是 "Call to undefined function App\belongsToMany"。

这是用于关系的两个模型之一：

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Review extends Model
{
protected $table = "reviews";

protected $fillable = [ 'user_id','email','review'];

public function user()
{
    return $this->belongsTo('App\User');
}

public function votes()
{
    return $this->belongsToMany('App\User')->withPivot('vote')->withTimestamps();
}

public function categories()
{
    return $this-belongsToMany('Category','category_review','review_id','category_id')->withTimestamps();
}

public function tags()
{
    return $this->belongsToMany('App\Tag')->withTimestamps();
}

}

我的另一个型号：

<?php

 namespace App;

 use Illuminate\Database\Eloquent\Model;

 class Category extends Model
 {
public function reviews()
{
    return $this->belongsToMany('App\Review','category_review','category_id','review_id')->withTimestamps();
}

public function children()
{
    return $this->hasMany('App\Category','parent_id');
}

public function parent()
{
    return $this->belongsTo('App\Category','parent_id');
}

}

问题是，我可以运行 App\Category::find(1)->reviews;但是，我不能运行 App\Review::find(1)->categories;它说 "Call to undefined function App\BelongsToMany"

Answer 1

您的 categories() 方法有两个错误。

public function categories()
{
    return $this-belongsToMany('Category','category_review','review_id','category_id')->withTimestamps();
}

第一个错误是箭头。你输入 $this-belongsToMany 但它应该是 $this->belongsToMany.

第二个错误是命名空间。应该是 App\Category.

加在一起，方法应该是：

public function categories()
{
    return $this->belongsToMany('App\Category','category_review','review_id','category_id')->withTimestamps();
}

调用未定义函数 App\belongsToMany [Laravel]

Call to undefined function App\belongsToMany [Laravel]

php

laravel

eloquent

laravel-5