测试方法：twoCate：

public function twoCate(){    $where = array(        'category_id'=>43    );    $list = D('TwoView')->where($where)->select();    p($list);    }

模型：

      array(            'id','uid','name','title','update_time',            '_type' => 'LEFT'        ),        'document_article' => array(            'content',            '_on' => 'document.id = document_article.id'        )    );}

组合后的列表：

array(3) {  [0]=>  array(6) {    ["id"]=>    string(1) "7"    ["uid"]=>    string(1) "1"    ["name"]=>    string(0) ""    ["title"]=>    string(15) "医院新闻一"    ["update_time"]=>    string(10) "1502544150"    ["content"]=>    string(750) "医院新闻一医院新闻一医院新闻详情"  }  [1]=>  array(6) {    ["id"]=>    string(1) "8"    ["uid"]=>    string(1) "1"    ["name"]=>    string(0) ""    ["title"]=>    string(15) "医院新闻二"    ["update_time"]=>    string(10) "1502544139"    ["content"]=>    string(195) "医院新闻二医院新闻二医院新闻详情"  }  [2]=>  array(6) {    ["id"]=>    string(1) "9"    ["uid"]=>    string(1) "1"    ["name"]=>    string(0) ""    ["title"]=>    string(15) "医院新闻三"    ["update_time"]=>    string(10) "1502544159"    ["content"]=>    string(735) "医院新闻三医院新闻三医院新闻详情"  }}