As per http://edgeguides.rubyonrails.org/configuring.html and this post I have this in application.rb
config.active_record.schema_format = :sql
However, it's still creating db/schema.rb (even after I delete it) and more importantly it's not creating the schema in sql when I run "rake db:migrate". Anyone know what I'm doing wrong? I'm on Rails 3.1 pre.
Well, this could be a rails bug, but you can always generate your db structure with this:
rake db:structure:dump
This is going to generate an "#{Rails.env}.sql" file for you with your database structure in SQL.
来源：https://stackoverflow.com/questions/7034977/how-to-create-schema-in-sql