将SQL查询转换为Active Record

Question

我需要使用以下命令在Ruby on Rails中查询我的数据库：

select p.name from shoppe_products p
join shoppe_product_categorizations ca on (p.id = ca.product_id)
join shoppe_product_categories c on (c.id = ca.product_category_id)
where c.id = 2

我使用Ruby v 2.1.5，Rails v 4和PG 9.4。

Answer 1

您只需执行sql：

即可

query_id = ActiveRecord::Base.connection.quote(id_param)
results = ActiveRecord::Base.connection.exec_query(
  "select p.name from shoppe_products p
  join shoppe_product_categorizations ca on (p.id = ca.product_id)
  join shoppe_product_categories c on (c.id = ca.product_category_id)
  where c.id = #{query_id}"
)

不知道你的模型等，这是我能猜到的最好的解决方案。