rails/rails — pull request #7140 by seamusabshere (2012-07-23 22:34:09+00:00)
Title: Make sure :environment task is executed before db:schema:load or db:structure:load

Otherwise, if schema_format = :sql, you will see:

$ rake db:setup --trace
** Invoke db:setup (first_time)
** Invoke db:schema:load_if_ruby (first_time)
** Invoke db:create (first_time)
** Invoke db:load_config (first_time)
** Invoke rails_env (first_time)
** Execute rails_env
** Execute db:load_config
** Execute db:create
db_example_development already exists
db_example_test already exists
** Execute db:schema:load_if_ruby #<-------- :environment hasn't been executed yet
** Invoke db:schema:load (first_time)
** Invoke environment (first_time)
** Execute environment
** Execute db:schema:load
~/db_example/db/schema.rb doesn't exist yet. Run `rake db:migrate` to create it then try again.