创建动态的Laravel访问器 [英] Create dynamic Laravel accessor

问题描述

我有一个Product模型，也有一个Attribute模型. Product和Attribute之间的关系是多对多的.在我的Product模型上，我试图创建一个动态访问器.我熟悉此处中所述的Laravel的访问器和更改器功能.我遇到的问题是，我不想在每次创建产品属性时都创建访问器.

I have a Product model and also an Attribute model. The relationship between Product and Attribute is many to many. On my Product model I am trying to create a dynamic accessor. I am familiar with Laravel's accessors and mutators feature as documented here. The problem I am having is that I do not want to create an accessor every time I create a product attribute.

例如，某产品可能具有可以这样设置的颜色属性:

For example, A product may have a color attribute which could be setup like so:

/**
 * Get the product's color.
 *
 * @param  string  $value
 * @return string
 */
public function getColorAttribute($value)
{
    foreach ($this->productAttributes as $attribute) {
        if ($attribute->code === 'color') {
            return $attribute->pivot->value;
        }
    }

    return null;
}

然后可以像$product->color这样访问产品的颜色. 如果要在产品中添加size属性，则需要在Product模型上设置另一个访问器，以便可以像$product->size那样访问该访问器.

The product's color could then be accessed like so $product->color. If I where to add a size attribute to the product I would need to setup another accessor on the Product model so I could access that like so $product->size.

有没有一种方法可以设置单个动态"访问器来处理作为属性访问的所有属性?

我是否需要使用自己的功能覆盖Laravel的访问器功能?

推荐答案

是的，您可以将自己的逻辑添加到Eloquent Model类的getAttribute()函数中(在模型中覆盖它)，但是我认为，这不是一个好习惯.

Yes, you can add your own piece of logic into the getAttribute() function of the Eloquent Model class (override it in your model), but in my opinion, it's not a good practice.

也许您可以拥有一个功能:

Maybe you can have a function:

public function getProductAttr($name)
{
    foreach ($this->productAttributes as $attribute) {
        if ($attribute->code === $name) {
            return $attribute->pivot->value;
        }
    }

    return null;
}

并这样称呼它:

$model->getProductAttr('color');

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