rails lazy loding query

https://rubyinrails.com/2014/01/08/what-is-lazy-loading-in-rails/

https://www.theodinproject.com/courses/ruby-on-rails/lessons/active-record-queries#relations-and-lazy-evaluation

左侧console命令；右侧是log

本条语句右侧无查询log

User.where(id: 1); nil

1.png

本条语句右侧有查询语句

User.where(id: 1).load; nil

2.png

注意class对比

3.png

参考：https://apidock.com/rails/ActiveRecord/Relation/load