Question

我创建了数据库表users，groups和group_user（MySQL）。而group_user表（中间表）包含user_id和{{ 1}}。用户和群体的关系是多对多的。我想删除role_id表中的一个组。在删除组之前，我想检查是否有任何用户属于该组。我试着这样做。

Group.php（Model）

groups

Service.php

 public function users()
    {
        return $this->belongsToMany('\Modules\User\Models\User');
    }

但这不起作用。

Answer 1

我发现了。

service.php

public function deleteGroup($data) {

    $group = Group::find($data['groupID']);
    if (!$group){
        return [
            "msg" => "Failed to delete group. Group not found."
        ];
    }
    // find out any one belongs to the group.           
    $result = $group->users->first()->userID;
    if ($result){
        return [
            "msg" => "Failed to delete group. Group has users."
        ];
    }

    $result = $group->delete($data['groupID']);
    if(!$result){
        return [
            "msg" => "Failed to delete group."
        ];
    }

    return [
        "msg" => "Successfully deleted group."
    ];
}

我就是这样做的。如果还有其他方式请告诉我。感谢。

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