如何使用PHP活动记录管理关系

我在Code Igniter中有一个扩展为HMVC的现有项目。也通过sparc使用php-activerecord。

对于一个新模块，我创建了两个具有一对多关系的表，直接在DB级别（在MySQL中）强制执行。表是"nassignment"（PK id）和"nassignment_assignee"（FK assignment_id）。

在模型下，我创建了两个类"nassignment.php"（具有类nassignment）和"nassignment_assignee.php"（类名为nassignment_assignee）。

下面是我在控制器中尝试的代码

$this->load->model("nassignment");
$nAssignmentArr = $this->nassignment->all();

并得到以下错误

[Fri Aug 02 13:50:52 2013] [error] [client 127.0.0.1] PHP Fatal error:  Uncaught 
exception 'ReflectionException' with message 'Class Nassignmentassignee does not exist' 
in /home/kapil/projects/<project>/application/sparks/php-activerecord/0.0.2/vendor/php-
activerecord/lib/Reflections.php:33'nStack trace:'n#0 
/home/kapil/projects/<project>/application/sparks/php-activerecord/0.0.2/vendor/php-
activerecord/lib/Reflections.php(33): ReflectionClass-
>__construct('Nassignmentassi...')'n#1 
/home/kapil/projects/<project>/application/sparks/php-activerecord/0.0.2/vendor/php-
activerecord/lib/Relationship.php(286): ActiveRecord''Reflections-
>add('Nassignmentassi...')'n#2 /home/kapil/projects/<project>/application/sparks/php-
activerecord/0.0.2/vendor/php-activerecord/lib/Relationship.php(281): 
ActiveRecord''AbstractRelationship->set_class_name('Nassignmentassi...')'n#3 
/home/kapil/projects/<project>/application/sparks/php-activerecord/0.0.2/vendor/php-
activerecord/lib/Relationship.php(464): ActiveRecord''AbstractRelationship-
>set_inferred_class_name()'n#4 /home/kapil/projects/<project>/application/sparks/php-
activerecord/0.0 in /home/kapil/projects/<project>/application/sparks/php-
activerecord/0.0.2/vendor/php-activerecord/lib/Reflections.php on line 33

型号代码为

nassignment.php

class Nassignment Extends ActiveRecord'Model{
    static $table_name = 'nassignment';
    //Work fine if I remove following line, but do not get data
    static $has_many = array(
            array('nassignment_assignee')
        );
}

nassignment_assignee.php

class Nassignment_assignee Extends ActiveRecord'Model{
    static $table_name = 'nassignment_assignee';
}

任何建议，为什么它不工作