小编clo*_*ude的帖子

我对一个旧的 Codeigniter 项目有这样的查询：

$this->db->select("SUM(source = 'FBS) AS facebook");
$this->db->select("SUM(source = 'FBS' AND promotion = 0) AS facebook_promotion");
$this->db->select("SUM(source = 'IG') AS instagram");
$this->db->select("SUM(source = 'LP') AS landing_page");   

如果可以使用 Eloquent 而不是查询生成器或原始查询，我希望使用 Laravel 获得相同的结果。