Question

我有3张桌子：成员（ID，名字） lesson_member（id，member_id，lesson_id，注释）课程（id，date_time，完整）当我在数据透视表（lesson_member）中插入/删除或更新记录时，我想检查该课程是否具有最多的成员。如果是，则字段满必须为true，否则为false。我认为最好的方法是使用观察员。这是我的观察者：

updateFullLesson（$ lessonLicenseMember）; }

    public function deleting(LessonLicenseMember $lessonLicenseMember)
    {
        $this->updateFullLesson($lessonLicenseMember);
    }

    public function updateFullLesson(LessonMember $lessonMember): void
    {
        $maxMembers = $lessonMember->lesson->course->type->max_members;
        $countActualMembers = LessonMember::where('lesson_id', $lessonMember->lesson->id)->count();
        $lesson=Lesson::find($lessonMember->lesson->id);
        if ($countActualMembers + 1 >= $maxMembers) {
            $lesson->full = true;
        } else {
            $lesson->full = false;
        }
        $lesson->save();
    }
}

这是控制器中的3个功能：

 <?php
 public function removeMember($lessonMemberId)
    {
        $lessonMember=LessonMember::findOrFail($lessonMemberId);
        $lesson=$lessonMember->lesson;
        $lessonMember->delete();
        return redirect()->route('lessons.edit',['lesson'=>$lesson->id])->with('id',trans('lesson.member_removed'))->withInput(['tab'=>'tab2']);
    }


     public function editLessonLicenseMember($lessonLicenseMemberId,Request $request)
    {

        $lessonMember=LessonMember::findOrFail($lessonLicenseMemberId);
        $lessonMember->notes=$request->notes;
        $lessonMember->save();

        //return redirect()->route('lessons.edit',['lesson'=>$lesson->id])->with('id',trans('lesson.member_removed'))->withInput(['tab'=>'tab2']);
    }

    public function addMember(Request $request)
    {
        $lessonMember=new LessonMember();

        $lessonId = $request->session()->get('lessonId',1);

        if((!($lessonMember::where('lesson_id','=',$lessonId)
            ->where('license_member_id','=',$request->licenseMemberId)
            ->exists()))) {

            $lessonMember->lesson_id = $lessonId;
            $lessonMember->license_member_id = $request->licenseMemberId;
            $lessonMember->save();

    }

当我尝试该程序时，它没有给我任何错误，但是数据库中的字段从未更改。

Laravel模型事件观察者

0 个答案: