title: cakephp: $belongsTo in model is not working
body: <p>table: graduate_applicants</p>
  
  <pre><code>CREATE TABLE IF NOT EXISTS `graduate_applicants` (
    `grat_id` int(10) NOT NULL auto_increment,
    `studentnum` int(9) NOT NULL,
    `QuarterID` int(10) NOT NULL,
    PRIMARY KEY  (`grat_id`)
  ) 
  </code></pre>
  
  <p>table: stu_students</p>
  
  <pre><code>CREATE TABLE IF NOT EXISTS `stu_students` (
    `id` int(11) NOT NULL auto_increment,
    `studentid` int(9) default NULL,
    `firstname` varchar(50) default NULL,
    `lastname` varchar(50) default NULL,
    `email` varchar(100) default NULL,
    PRIMARY KEY  (`id`),
    KEY `studentid` (`studentid`),
   )
  </code></pre>
  
  <p>model：</p>
  
  <pre><code>class GraduateApplicant extends AppModel{
  
  var $name = 'GraduateApplicant';
  
  var $tablePrefix = '';
  
  var $belongsTo = array('Student' =&gt; array('className' =&gt; 'Student','foreignKey' =&gt; false,''conditions' =&gt; array('Student.studentid=GraduateApplicant.studentnum'),'fields' =&gt; '','order' =&gt; ''),);
  
  }
  </code></pre>
  
  <p>controller:</p>
  
  <pre><code>$list = $this-&gt;paginate('GraduateApplicant');
  </code></pre>
  
  <p>i can not understand why $list is empty ?</p>