Rails 3 ActiveRecord条件包括？

Question

我知道这可以做到:

Article.where("published_at <= ?", Time.now).includes(:comments)

但是,如果我只想在过去一个月发布评论怎么办？

.includes运算符是否允许条件？

Answer 1

Article.includes(:comments).where("articles.published_at <= ? and comments.created_at >= ?", Time.now, Time.now - 1.month)

编辑:

Article.joins(:comments).where("articles.published_at <= ? and comments.created_at >= ?", Time.now, Time.now - 1.month)