如何從eloquent，silex中的中間表中獲取數據

Question

我創建了數據庫表users ， groups和group_user （MySQL）。而group_user表（中間表）包含user_id和role_id 。 用戶和群體的關系是多對多的。 我想刪除groups表中的groups 。 在刪除組之前，我想檢查是否有任何用戶屬於該組。 我試着這樣做。

Group.php（型號）

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

Service.php

public function deleteGroup($data) {
    if (!isset($data['groupID']))
        return ['error' => 'Failed to delete group. Group id is required'];

    $group = Group::find($data['groupID']);
    if (!$group)
        return ['error' => 'Failed to delete group. Group not found'];

    // check any user belongs to group. 
    $result = $group->users()->pivot->user_id;

    if(!$result){
       $group->delete();
       return ['success' => 'Successfully delete group.'];
    }
    return ['error' => 'Failed to delete group. Group not found'];
}

但這不起作用。

Answer 1

我發現了。

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."
    ];
}

我就是這樣做的。 如果還有其他方式請告訴我。 謝謝。