How to delete all data from all tables in Rails?

Question

I can do Post.delete_all to delete all my posts, but what if I want to delete all posts, comments, blogs, etc.?

How do I iterate over all my models and

Answer 1

If you're trying to do this from code instead of the command line, say from a Test::Unit::TestCase#teardown method, you could do either

class MyTest < Test::Unit::TestCase

  def teardown
    ActiveRecord::Base.subclasses.each(&:delete_all)
  end

end

or

class MyTest < Test::Unit::TestCase

  def teardown
    Rake::Task['db:reset'].invoke
  end

end

I warn you, though: neither is particularly fast. You're definitely better off with transactional tests if you can.