We have a Rails3 app we've just started development on. We use a has_and_belongs_to_many relation between two models. Every time we use one of these models, ActiveRecord executes a DESCRIBE-query on the join-table, e.g.:We have a Rails3 app we've just started develop
阅读背景：
ActiveRecord为has_and_belongs_to_many关系生成昂贵的描述查询
来源：互联网
分享到：
