Laravel 在 null 上调用成员函数 isValid()
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Laravel Call to a member function isValid() on null
提问by Cruzito
In my project users can upload stuff and attach an image. I have a controller where I do a isValid check on the file input. Everything works great as long as you select a file. When I don't select a file I get this error
在我的项目中，用户可以上传内容并附加图像。我有一个控制器，我在其中对文件输入进行 isValid 检查。只要您选择一个文件，一切都会很好。当我不选择文件时，我收到此错误
Call to a member function isValid() on null
On this line of code:
在这行代码中：
if (Input::file('image')->isValid())
The error is obvious since I don't select an image but I actually have no idea how I can fix this.
错误很明显，因为我没有选择图像，但实际上我不知道如何解决这个问题。
If anyone can help I'd be very happy :) Thanks in advance!
如果有人可以帮助我会很高兴:) 提前致谢！
回答by Ekene Oguikpu
add enctype="multipart/form-data"to your form
添加enctype="multipart/form-data"到您的表单
回答by Pratik Soni
First you need to check if your request is containing that file / input or not.
首先，您需要检查您的请求是否包含该文件/输入。
Determining If A File Was Uploaded
确定文件是否已上传
if (Request::hasFile('image'))
{
/*Determining If An Uploaded File Is Valid*/
if (Request::file('image')->isValid())
{
//
}
}
Just for your info also make sure you are getting file while posting.
enctype="multipart/form-data"
仅供您参考，还请确保您在发布时获取文件。
enctype="multipart/form-data"
You can use any of Input and Request facade.
Input class is also referencing to \Illuminate\Http\Requestin laravel
您可以使用任何输入和请求外观。输入类也在\Illuminate\Http\Requestlaravel 中引用
