轉換SQL查詢的Active Record

Question

我需要使用查詢我的數據庫的Ruby on Rails的：

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 2.1.5 v，Rails的4節和PG 9.4。

Answer 1

你可以簡單地執行sql：

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}" 
) 

不知道你的模型等等，這是我能猜到最佳的解決方案。