Laravel 上传照片可选

Question

    public function submitReview(Request $request){
        
        $request->validate([
            'comment'=> 'required',
            'R_Image' => 'mimes:kpg,png,jpeg|max:5048'


        ]);

        
            
        $newImageName = time() . '-' . $request->name . '.' . 
        $request->R_Image->extension();
        $request->R_Image->move(public_path('images'), $newImageName);
    


        $UserId=Auth::id();
        $query = DB::table('review') ->insert ([

                        'User_Id'=> $UserId,
                        'P_Id'=>$request->input('productID' ),
                        'R_Rating'=>$request->input('R_Rating' ),
                        'R_Comment'=>$request->input('comment' ),
                        'R_Image'=>$newImageName,
                        "created_at" =>  \Carbon\Carbon::now(), # new \Datetime()
                        "updated_at" => \Carbon\Carbon::now(), 
                    

                    ]);
        
        if ($query) {
            return back()-> with ('success' , 'Review has been successfully submitted');
        }else{
            return back() -> with ('fail' , 'Something went wrong');
        }

    }
}

这是我的审查代码。 用户可以在提交表单时上传图片，图片不是必需的，这是可选的。 但是，当用户不上传图像时，我收到错误消息“呼叫成员 function extension() on null”。 但是，如果提交带有图像的表单，我没有收到错误。 我的代码有问题吗？

Answer 1

'R_Image' => 'mimes:`jpg`,png,jpeg|max:5048' 

Answer 2

public function submitReview(Request $request){
        
        $request->validate([
            'comment'=> 'required'
            ]);

        $newImageName = "";

        if ($request->hasFile('R_Image')) {
            $request->validate([
            'R_Image' => 'mimes:kpg,png,jpeg|max:5048'
            ]);

            $newImageName = time() . '-' . $request->name . '.' . 
            $request->R_Image->extension();
            $request->R_Image->move(public_path('images'), $newImageName);
        }

        $UserId=Auth::id();
        $query = DB::table('review') ->insert ([

                        'User_Id'=> $UserId,
                        'P_Id'=>$request->input('productID' ),
                        'R_Rating'=>$request->input('R_Rating' ),
                        'R_Comment'=>$request->input('comment' ),
                        'R_Image'=>$newImageName,
                        "created_at" =>  \Carbon\Carbon::now(), # new \Datetime()
                        "updated_at" => \Carbon\Carbon::now(), 
                    

                    ]);
        
        if ($query) {
            return back()-> with ('success' , 'Review has been successfully submitted');
        }else{
            return back() -> with ('fail' , 'Something went wrong');
        }

    }
}