php 如何使用 Traits - Laravel 5.2
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How to use Traits - Laravel 5.2
提问by David
I'm new to Traits, but I have a lot of code that is repeating in my functions, and I want to use Traits to make the code less messy. I have made a Traitsdirectory in my Httpdirectory with a Trait called BrandsTrait.php. And all it does is call on all Brands. But when I try to call BrandsTrait in my Products Controller, like this:
我是 Traits 的新手，但我的函数中有很多重复的代码，我想使用 Traits 使代码不那么混乱。我Traits在我的Http目录中创建了一个名为BrandsTrait.php. 它所做的就是调用所有品牌。但是当我尝试在我的产品控制器中调用 BrandsTrait 时，如下所示：
use App\Http\Traits\BrandsTrait;
class ProductsController extends Controller {
use BrandsTrait;
public function addProduct() {
//$brands = Brand::all();
$brands = $this->BrandsTrait();
return view('admin.product.add', compact('brands'));
}
}
it gives me an error saying Method [BrandsTrait] does not exist.Am I suppose to initialize something, or call it differently?
它给了我一个错误，说Method [BrandsTrait] 不存在。我是想初始化一些东西，还是用不同的方式称呼它？
Here is my BrandsTrait.php
这是我的 BrandsTrait.php
<?php
namespace App\Http\Traits;
use App\Brand;
trait BrandsTrait {
public function brandsAll() {
// Get all the brands from the Brands Table.
Brand::all();
}
}
回答by Scopey
Think of traits like defining a section of your class in a different place which can be shared by many classes. By placing use BrandsTraitin your class it has that section.
想想traits，比如在不同的地方定义你的类的一个部分，可以被许多类共享。通过放置use BrandsTrait在您的班级中，它具有该部分。
What you want to write is
你想写的是
$brands = $this->brandsAll();
That is the name of the method in your trait.
那就是你的 trait 中方法的名称。
Also - don't forget to add a return to your brandsAllmethod!
另外 - 不要忘记在你的brandsAll方法中添加一个 return ！
回答by Sonford Son Onyango
use App\Http\Traits\BrandsTrait;
class ProductsController extends Controller {
use BrandsTrait;
public function addProduct() {
//$brands = Brand::all();
$brands = $this->brandsAll();
return view('admin.product.add', compact('brands'));
}
}
