ActiveRecord select a string field has a certain length in Rails 3?

Question

I've got a series of Posts and would like to select all posts where its title size is lesser than 30, how to do that?

Posts.where("len(title) < 30")? 

Answer 1

This should work:

Post.where("length(title) < 30") 

You're correctly using #where as shorthand for :conditions in Rails 3. You can pass in any snippet that works in your local SQL directly.

Just remember that ActiveRecord model classes are singular by convention.