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

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.开发者_如何学运维where("len(title) < 30")?

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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.

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This works for me with MySQL: Post.find(:all, :conditions => "length(title) < 30")