ORM 中的 order by 和 group by (fuelphp)答案

【问题标题】：order by and group by in ORM (fuelphp)ORM 中的 order by 和 group by (fuelphp)
【发布时间】：2017-03-26 05:28:25
【问题描述】：

我正在尝试按标签排序和分组

$结果 = Model_Tag::query()->select(\Fuel\Core\Db::expr('count(*)'),'count')->select('tag')->group_by('tag')-> order_by('count','desc')->get();

$结果 = Model_Tag::query()->select(\Fuel\Core\Db::expr('count(*)','count'))->select('tag')->group_by('tag')-> order_by('count','desc')->get();

但是，无论我做什么，我都会收到错误，即未定义计数，因为 ORM 坚持对字段名称进行别名：

选择计数(*) AS t0_c0, t0.tag AS t0_c1, t0.id AS t0_c2 FROM tag AS t0 GROUP BY t0.tag ORDER BY t0.count DESC"

导致未找到列错误

或者：

$query = Model_Tag::query()->select(\Fuel\Core\Db::expr('count(*) as count'))->select('tag')->group_by('tag')->order_by('count','desc')->get();

查询

SELECT count(*) as count AS t0_c0, t0.tag AS t0_c1, t0.id AS t0_c2 FROM tag AS t0 GROUP BY t0.tag ORDER BY t0.countDESC

给出语法错误

【问题讨论】：

标签： fuelphp fuelphp-orm

【解决方案1】：

在 FuelPHP 1.8 版中，访问您的控制器并查询设置此示例：

$result = Model_Tag::query()->group_by('tag')->order_by('count','desc')->get();

如果你得到计数

$count = count($result);

警告！不要打电话给你的select('tag')，因为你已经在使用Model_Tag

参考：https://fuelphp.com/docs/classes/database/usage.html

【讨论】：