带有动态参数的 Laravel 5 全局作用域
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Laravel 5 Global Scope with Dynamic Parameter
提问by mtpultz
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:
我们在使用具有动态查询参数的全局范围时遇到问题。全局范围基于管理器 ID，但 $model 为空，并且 $this 指的是管理器范围而不是模型，因此 $this->id 是未定义的属性。有没有办法做这样的事情：
public function apply(Builder $builder, Model $model)
{
return $builder->where('manager', $model->id); // $this->id
}
I'm assuming that $modelis supposed to be the manager model, but since it is empty and I can't find any documentation on it I'm not entirely sure (if anyone can tell me in a comment I'd appreciate it). This is our global scope method in the Manager model:
我假设这$model应该是经理模型，但由于它是空的，我找不到任何关于它的文档，我不完全确定（如果有人能在评论中告诉我，我会很感激）。这是我们在 Manager 模型中的全局作用域方法：
protected static function boot()
{
parent::boot();
static::addGlobalScope(new ManagerScope);
}
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:
由于全局作用域不需要应用显式方法，我认为可能在引导中添加一些内容可能会允许一个额外的参数，例如：
protected static function boot()
{
parent::boot();
static::addGlobalScope(new ManagerScope($this->id);
}
But this isn't allowed in a static method, which makes sense after I saw the error.
但这在静态方法中是不允许的，这在我看到错误后才有意义。
回答by peterm
Naturally global scopes are applied automatically and there are no way to pass parameters to them directly.
自然地，全局作用域是自动应用的，无法直接将参数传递给它们。
Therefore you can either stick with a dynamic local scope, which IMO makes more sense,
因此，您可以坚持使用 IMO 更有意义的动态本地范围，
public function scopeForManager($query, $manager)
{
return $query->where('manager', $manager->id);
}
Document::forManager($manager)->all();
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
或者如果管理器信息在某种全局状态（即会话）中可用，您可以创建某种 ManagerResolver 类
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());
}
}
and pass an instance of it into your scope
并将它的一个实例传递到您的作用域中
protected static function boot()
{
parent::boot();
static::addGlobalScope(new ManagerScope(new ManagerResolver());
}
