laravel 使用 ModelNotFoundException
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/23938061/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Using ModelNotFoundException
提问by cookie
I'm starting out in Laravel and want to discover more about using error handling especially the ModelNotFoundExceptionobject.
我从 Laravel 开始，想了解更多关于使用错误处理的信息，尤其是ModelNotFoundException对象。
<?php
class MenuController extends BaseController {
function f() {
try {
$menus = Menu::where('parent_id', '>', 100)->firstOrFail();
} catch (ModelNotFoundException $e) {
$message = 'Invalid parent_id.';
return Redirect::to('error')->with('message', $message);
}
return $menus;
}
}
?>
In my model:
在我的模型中：
<?php
use Illuminate\Database\Eloquent\ModelNotFoundException;
class Menu extends Eloquent {
protected $table = 'categories';
}
?>
Of course for my example there are no records in 'categories' that have a parent_id > 100this is my unit test. So I'm expecting to do something with ModelNotFoundException.
当然，对于我的示例，“类别”中没有记录，parent_id > 100这是我的单元测试。所以我期待用ModelNotFoundException.
If I run http://example.co.uk/fin my browser I receive:
如果我在浏览器中运行http://example.co.uk/f，我会收到：
Illuminate \ Database \ Eloquent \ ModelNotFoundException
No query results for model [Menu].
the laravel error page - which is expected, but how do I redirect to my route 'error' with the pre-defined message? i.e.
laravel 错误页面 - 这是预期的，但是如何使用预定义的消息重定向到我的路由“错误”？IE
<?php
// error.blade.php
{{ $message }}
?>
If you could give me an example.
如果你能给我一个例子。
采纳答案by The Alpha
In Laravelby default there is an error handler declared in app/start/global.phpwhich looks something like this:
在Laravel默认情况下没有宣布一个错误处理程序app/start/global.php，看起来是这样的：
App::error(function(Exception $exception, $code) {
Log::error($exception);
});
This handler basically catches every error if there are no other specific handler were declared. To declare a specific (only for one type of error) you may use something like following in your global.phpfile:
如果没有声明其他特定的处理程序，这个处理程序基本上会捕获每个错误。要声明特定的（仅针对一种类型的错误），您可以在global.php文件中使用以下内容：
App::error(function(Illuminate\Database\Eloquent\ModelNotFoundException $exception) {
// Log the error
Log::error($exception);
// Redirect to error route with any message
return Redirect::to('error')->with('message', $exception->getMessage());
});
it's better to declare an error handler globally so you don't have to deal with it in every model/controller. To declare any specific error handler, remember to declare it after (bottom of it) the default error handler because error handlers propagates from most to specific to generic.
最好全局声明一个错误处理程序，这样您就不必在每个模型/控制器中处理它。要声明任何特定的错误处理程序，请记住在（其底部）默认错误处理程序之后声明它，因为错误处理程序从大多数传播到特定再到泛型。
Read more about Errors & Logging.
阅读有关错误和日志记录的更多信息。
回答by Razor
Just use namespace
只需使用命名空间
try {
$menus = Menu::where('parent_id', '>', 100)->firstOrFail();
}catch (\Illuminate\Database\Eloquent\ModelNotFoundException $e) {
$message = 'Invalid parent_id.';
return Redirect::to('error')->with('message', $message);
}
Or refer it to an external name with an alias
或将其引用为具有别名的外部名称
use Illuminate\Database\Eloquent\ModelNotFoundException as ModelNotFoundException;
