Laravel 7路线模型绑定不起作用(路线中的模型始终为空)

问题描述

我正在研究Laravel 7项目.在我的项目中，我正在进行路线模型绑定.但是它不起作用，并且路由中的模型始终返回null.这是我到目前为止所做的.

I am working on a Laravel 7 project. In my project, I am doing the route model binding. But it is not working and the model in the route is always returning null. This is what I have done so far.

我声明一条路线

Route::put('restaurant-category/{category}', 'RestaurantCategoryController@update')->name('restaurant-category.update');

如您所见，模型绑定有一个占位符{category}.

As you can see, there is a placeholder for model binding, {category}.

这是我在控制器中的动作.

This is my action in the controller.

public function update(RestaurantCategory $category, UpdateRestaurantCategoryRequest $request)
    {
        //here $category is always null even if I passed the valid category id.
    }

在操作方法中，即使我传递了正确的ID，$ category也始终为null.我的代码有什么问题，我该如何解决?

In the action method, the $category is always null even if I passed the correct id for it. What is wrong with my code and how can I fix it?

推荐答案

首先必须订购，控制器方法是首先请求$ request，然后进行模型注入:

First you have to order, the controller method is first Request $request and then the model injection:

public function update(UpdateRestaurantCategoryRequest $request, RestaurantCategory $category)
    {
        //here $category is always null even if I passed the valid category id.
    }

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