我是laravel的新手，我一直与我的关系有关
类别
id name slug
-----------------------------------------------------------------
3 Location location
4 Outfits outfits
5 Other other
子类别
id category_id name slug
-----------------------------------------------------------------------------
12 3 Club club
13 3 Home / Hotel home-hotel
14 3 Outdoor outdoor
15 3 Studio studio
16 4 Bikini / Swimwear bikini-swimwear
17 4 Dress dress
19 4 Jeans jeans
35 5 Dancing dancing
类别模型
<?php
class Category extends Eloquent {
public $timestamps = false;
public function subcategory()
{
return $this->belongsToMany('subcategory', "sub_categories");
}
}
我得到以下错误
SQLSTATE[42000]: Syntax error or access violation: 1066 Not unique table/alias: 'sub_categories' (SQL: select `sub_categories`.*, `sub_categories`.`category_id` as `pivot_category_id`, `sub_categories`.`subcategory_id` as `pivot_subcategory_id` from `sub_categories` inner join `sub_categories` on `sub_categories`.`id` = `sub_categories`.`subcategory_id` where `sub_categories`.`category_id` = ?) (Bindings: array ( 0 => 1, ))
请某人指出我做错了什么好吗？
您应该为同一个表提供不同的别名
更改此
inner join `sub_categories`
至
inner join `sub_categories` as sc
^^--//-this alias use it instead of sub_categories
在您的查询中，它将是
select `sub_categories`.*, sc.`category_id` as `pivot_category_id`, sc.`subcategory_id` as `pivot_subcategory_id` from `sub_categories` inner join `sub_categories` sc on sc.`id` = `sub_categories`.`subcategory_id` where `sub_categories`.`category_id` = ?) (Bindings: array ( 0 => 1, )
示例：
select * from table1 as t1
inner join table1 as t2
on t1.id = t2.id
澄清您的错误：Not unique table/alias
您正在将没有别名的同一个表连接到它们之间的不同表。
问题看起来像是两个表同时映射到相同名称的sub_category。
多对多关系需要3个表（类别/子类别/类别_子类别），这些表需要不同的名称。如果其中两个表使用相同的名称进行映射，则会出现所显示的错误。
更改其中一个映射，您就应该启动并运行了。