Laravel 5具有动态参数的全局范围 [英] Laravel 5 Global Scope with Dynamic Parameter

问题描述

在使用带有动态查询参数的全局范围时，我们遇到了问题.全局作用域基于管理者ID，但是$ model为空，并且$ this指的是管理者作用域而不是模型，因此$ this-> id是未定义的属性.有没有办法做这样的事情:

We're having issues using a global scope with a dynamic query parameter. The global scope is based on the manager ID, but $model is empty, and $this refers to the manager scope not the model so $this->id is an undefined property. Is there a way to do something like this:

public function apply(Builder $builder, Model $model)
{
    return $builder->where('manager', $model->id); // $this->id
}

我假设 $ model 应该是经理模型，但是由于它是空的，而且我找不到关于它的任何文档，所以我不确定(如果有人可以在评论中告诉我，我将不胜感激.这是Manager模型中的全局范围方法:

I'm assuming that $model is supposed to be the manager model, but since it is empty and I can't find any documentation on it I'm not entirely sure (if anyone can tell me in a comment I'd appreciate it). This is our global scope method in the Manager model:

protected static function boot()
{
    parent::boot();

    static::addGlobalScope(new ManagerScope);
}

由于全局范围不需要应用显式方法，我想也许在引导中添加一些内容可能会允许一个额外的参数，例如:

Since global scopes don't require an explicit method to be applied I thought maybe adding something to the boot might allow for an extra parameter something like:

protected static function boot()
{
    parent::boot();

    static::addGlobalScope(new ManagerScope($this->id);
}

但是在静态方法中不允许这样做，这在我看到错误后才有意义.

But this isn't allowed in a static method, which makes sense after I saw the error.

推荐答案

自然，全局范围会自动应用，并且无法直接将参数传递给它们.

Naturally global scopes are applied automatically and there are no way to pass parameters to them directly.

因此，您可以坚持使用动态局部范围，这对IMO来说更有意义，

Therefore you can either stick with a dynamic local scope, which IMO makes more sense,

public function scopeForManager($query, $manager)
{
    return $query->where('manager', $manager->id);
}

Document::forManager($manager)->all();

，或者如果经理信息在某种全局状态下(即会话)可用，则可以创建某种ManagerResolver类

or if the a manager info is available in some kind of global state (i.e. session) you can create some sort of ManagerResolver class

class ManagerScope
{
    protected $resolver;

    public function __construct(ManagerResolver $resolver)
    {
        $this->resolver = $resolver
    }

    public function apply(Builder $builder, Model $model)
    {
        return $builder->where('manager', $this->resolver->getManagerId());
    }    
}

并将其实例传递到您的作用域

and pass an instance of it into your scope

protected static function boot()
{
    parent::boot();
    static::addGlobalScope(new ManagerScope(new ManagerResolver());
}

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