thinkphp6 belongsToMany多对多带where关联查询

coupon_cate 分类表

coupon_brand 品牌表

coupon_brand_cate_relation 分类和品牌 =》 多对多关系表

代码如下

/**
     * @descripe 关联关系-品牌
     */
    public function couponBrand(){

        return $this->belongsToMany(CouponBrand::class,'coupon_brand_cate_relation','brand_id','cate_id');

    }

多对多关联查询 带where其他条件

$data = CouponCate::query()->where('coupon_cate.status', CouponCate::STATUS_ACTIVE)
            ->with(['couponBrand' => function($query) {
                // $query->getQuery() 需要取出原先的查询条件在拼上新的where条件
                $query->getQuery()->where('coupon_brand.status', CouponBrand::STATUS_ACTIVE)->order('sort desc');         
            }])
            
           ->select()->toArray();

with输出的sql语句 

SELECT `coupon_brand`.*,`pivot`.`cate_id` AS `pivot__cate_id`,`pivot`.`brand_id` AS `pivot__brand_id` FROM `coupon_brand` INNER JOIN `coupon_brand_cate_relation` `pivot` ON `pivot`.`brand_id`=`coupon_brand`.`id` WHERE `coupon_brand`.`status` = '1' AND `pivot`.`cate_id` IN ('1','2','3','4','5','6','7','8','9') ORDER BY `sort` DESC 

闭包查询 中的dump($query->getQuery());

关键点 $query->getQuery() 取出原先的查询条件 在拼上where的其他条件

注意以下这种写法会覆盖掉原先的where查询条件

$data = CouponCate::query()->where('coupon_cate.status', CouponCate::STATUS_ACTIVE)
           ->with(['couponBrand' => function($query){
               //todo 覆盖where条件，导致多对多查询无效，返回的是最后一条数据
               $query->where('coupon_brand.status', CouponBrand::STATUS_ACTIVE);
           }])

输出的sql语句 SELECT `coupon_brand`.*,`pivot`.`cate_id` AS `pivot__cate_id`,`pivot`.`brand_id` AS `pivot__brand_id` FROM `coupon_brand` INNER JOIN `coupon_brand_cate_relation` `pivot` ON `pivot`.`brand_id`=`coupon_brand`.`id` WHERE `pivot`.`cate_id` = '9' AND `coupon_brand`.`status` = '1'

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