Question

Laravel是否允许我们为模型添加多个策略？即考虑App\Providers\ASuthServiceProvider＆＃39; $policies属性：

protected $policies = [
    'App\Team' => 'App\Policies\TeamPolicy',
    'App\Team' => 'App\Policies\RoundPolicy',
    'App\Team' => 'App\Policies\AnotherPolicy',
];

我还没有在一个应用程序中对它进行测试，因为即使它有效，我也会在这里提出一个类似的问题，关于这是否被视为不良行为或是否容易出现意外行为。

我所拥有的替代方案是一个非常混乱的策略，包含与几个控制器相关的策略，以驼峰形式命名：

/**
 * Allows coach of Team and admin to see the Team management view.
 * Used in TeamManagementController
 *
 * @param  App\User   $user
 * @param  App\Team   $team
 * @return boolean
 */
public function manage(User $user, Team $team)
{
    return  $user->id === $team->user_id || $user->isAdmin();
}

/**
 * Allows a coach to detach themself from a Team.
 * Used in TeamController
 *
 * @param  App\User   $user
 * @param  App\Team   $team
 * @return boolean
 */
public function detach(User $user, Team $team)
{
    return  $user->id === $team->user_id;
}

/**
 * Below function are used for controllers other than TeamController and TeamManagementController.
 * Reason: We need to authorize, based on a Team. Hence, using this Policy.
 */

/**
 * Allows coach of Team, as well as admin to view players of a Team.
 * Used in PlayerController
 *
 * @param  App\User   $user
 * @param  App\Team   $team
 * @return boolean
 */
public function indexPlayers(User $user, Team $team)
{
    return  $user->id === $team->user_id || $user->isAdmin();
}

/**
 * Allows coach of Team, as well as admin to view players of a Team as an array.
 * Used in PlayerController
 *
 * @param  App\User   $user
 * @param  App\Team   $team
 * @return boolean
 */
public function fetchPlayers(User $user, Team $team)
{
    return  $user->id === $team->user_id || $user->isAdmin();
}

等。等

Answer 1

您可以使用特征来分隔策略的逻辑。

您将创建一个基TeamPolicy，然后使用基类中想要的各种方法创建多个特征。

<?php

class TeamPolicy
{
    use RoundPolicy, AnotherPolicy;
}

Answer 2

$policies变量使用模型作为键，将值作为策略值。密钥是唯一的，因此您只能为每个模型设置一个策略。但是，您可以在多个模型上使用策略。

在您的情况下，App\Policies\AnotherPolicy是唯一将被使用的select min(datetime), max(datetime), count(*) as numrecs, avg(temperature) from (select t.*, row_number() over (order by datetime) as seqnum, row_number() over (partition by (temperature >= 50)::int order by datetime) as seqnum_t from t ) t where temperature >= 50 group by (seqnum - seqnum_t) having max(datetime) >= min(datetime) + interval '30' minute;。同时为多个模型分配相同的策略实际上取决于您想要做什么。基本上你不需要凌乱或粗糙的代码。因此，如果您为两个模型创建策略并且策略代码变得太大，那么现在是时候考虑创建另一个策略是否会使代码更简单/更少。

Laravel中模型的多个策略

2 个答案: