按条件Ruby on Rails更新记录

Question

我们可以按条件更新记录而不先检查记录吗？

Answer 1

是的,方法是update_all.

# Update all books with 'Rails' in their title
Book.update_all "author = 'David'", "title LIKE '%Rails%'"

http://apidock.com/rails/ActiveRecord/Relation/update_all