在Laravel4中有许多透视表

在Laravel4中有许多透视表,laravel,laravel-4,eloquent,Laravel,Laravel 4,Eloquent,我正试图与雄辩者建立一种草率的关系,但不清楚从文件上看它是如何运作的 表格: users - id - firstname - ...etc accounts - id - user_id - username - ...etc roles - id - permissions account_role - id - account_id - role_id 型号 <?php class User extend

我正试图与雄辩者建立一种草率的关系,但不清楚从文件上看它是如何运作的

表格:

users
   - id
   - firstname
   - ...etc

accounts
   - id
   - user_id
   - username
   - ...etc

roles
   - id
   - permissions

account_role
   - id
   - account_id
   - role_id
型号

<?php
class User extends Eloquent {

    public function account()
    {
        return $this->hasOne('Account');
    }

    // This is what I'm trying to achieve
    public function roles()
    {
        return $this->hasManyThrough('Role', 'Account');
    }
}

class Role extends Eloquent {

    public function accounts()
    {
        return $this->belongsToMany('Account')->withTimestamps();
    }
}

class Account extends Eloquent {

    public function user()
    {
        return $this->belongsTo('User');
    }
}

最后,我通过以下方法解决了这个问题:

class User extends Eloquent {

    /**
     * @return \Illuminate\Database\Eloquent\Relations\BelongsToMany
     */
    public function roles()
    {
        return $this->account->belongsToMany('Navicula\Entities\Role');
    }
}
我怀疑这不会立即加载帐户,导致大量查询开销。然而,当我使用
User::with('roles')->limit(100)->get()尝试时
并记录查询,运行以下查询:

SELECT * FROM `users` WHERE `users`.`deleted_at` IS NULL LIMIT 100
SELECT * FROM `accounts` WHERE `accounts`.`deleted_at` IS NULL LIMIT 1
SELECT `roles`.*, `account_role`.`account_id` as `pivot_account_id`, `account_role`.`role_id` as `pivot_role_id` FROM `roles` inner join `account_role` on `roles`.`id` = `account_role`.`role_id` WHERE `account_role`.`account_id` in ('1', '2', '3', '4', '5', '6', '7', '8', '9', '10', '11', '12', '13', '14', '15', '16', '17', '19', '20', '21', '22', '23', '24', '25', '26', '27', '28', '29', '30', '31', '32', '33', '34', '35', '36', '37', '38', '39', '40', '41', '42', '43', '44', '45', '46', '47', '48', '49', '50', '51', '52', '53', '54', '55', '56', '57', '58', '60', '61', '62', '63', '64', '65', '67', '68', '70', '71', '72', '73', '74', '75', '78', '79', '80', '81', '82', '83', '84', '85', '86', '87', '88', '89', '90', '91', '92', '93', '94', '95', '96', '97', '98', '99', '100', '101', '102', '103', '104', '105', '106')

这正是我们想要的。谢谢泰勒;-)

hasManyThrough
不适用于多对多关系,请检查以下答案:。如果您仍然有问题,请随时提问。这是一个不错的解决方法,但我需要立即加载才能使用用户模型。也许在定义我自己的
关系
或其他方面有一个解决方案。不知道该怎么做。当然你可以扩展Eloquent并创建自定义关系、模型方法等等。这取决于你,我链接的答案应该会告诉你如何做到这一点。我对
belongsto做了完全相同的事情,通过另一种方式工作。