Question

我有几个共享一些共同功能的模型（由于它们的多态性），我想将它们放入ResourceContentModel类（甚至是特征）。

ResourceContentModel类将扩展eloquent Model类，然后我的各个模型将扩展ResourceContentModel。

我的问题是围绕模型字段，如$ with，$ appends和$ touches。如果我将这些用于ResourceContentModel中的任何常用功能，那么当我在我的子模型类中重新定义它们时，它会覆盖我在父类中设置的值。

寻找一些干净利落的建议？

例如：

class ResourceContentModel extends Model
{
    protected $with = ['resource']
    protected $appends = ['visibility']

    public function resource()
    {
        return $this->morphOne(Resource::class, 'content');
    }

    public function getVisibilityAttribute()
    {
        return $this->resource->getPermissionScope(Permission::RESOURCE_VIEW);
    }
}

class Photo extends ResourceContentModel
{
    protected $with = ['someRelationship']
    protected $appends = ['some_other_property']

    THESE ARE A PROBLEM AS I LOSE THE VALUES IN ResourceContentModel
}

我正在采取一种干净的方式来实现这一目标，因为我已经在层次结构中的额外类中插入以收集公共代码，因此子类不会过度改变。

Answer 1

不知道这是否有用......

public async static Task DeleteProjectFile(this Company companies)
    {
        var file = await GetCompanyFile(companies.CompanyName);
        if (file == null)
        {
            var folder = await GlobalFolder();
            file = await folder.CreateFileAsync(companies.CompanyName + GlobalFileExtension, CreationCollisionOption.ReplaceExisting);
        }
        Projects project = new Projects();

        companies.ProjectsListed.Remove(project);
    }

或者在ResourceContentModel上添加一个方法来访问该属性。

class Photo extends ResourceContentModel
{
    public function __construct($attributes = [])
    {
        parent::__construct($attributes);
        $this->with = array_merge(['someRelationship'], parent::$this->with);
    }
}

然后

class ResourceContentModel extends Model
{
    public function getParentWith()
    {
        return $this->with;
    }
}

修改

在第3个片段的构造函数中，

class Photo extends ResourceContentModel { public function __construct($attributes = []) { parent::__construct($attributes); $this->with = array_merge(['someRelationship'], parent::getParentWith()); } }

需要

$this->with = array_merge(['someRelationship'], parent->getParentWith());

Answer 2

我发现在PHP 7.1中使用parent::$this->appends导致PHP错误。

这对我有用：

父模型：

<?php

use Illuminate\Database\Eloquent\Model as BaseModel;

class Model extends BaseModel
{
    public function __construct($attributes = [])
    {
        parent::__construct($attributes);

        $this->append([
            'everyChildModelAppendsThis',
        ]);
    }
}

儿童模特：

<?php

class ChildModel extends Model
{
    protected $appends = [
        'childModelStuff',
    ];
}

laravel 5如何在子模型类中添加$ with with $ appends字段

2 个答案: