dump sql and reload

dump_sql.rb

> DB_STRUCTURE=db/null_schema.sql rake db:structure:dump


class NullMigration < ActiveRecord::Migration
  def up
    file_data = File.read('db/migrate/null_schema.sql')
    ActiveRecord::Base.connection.execute file_data
  end

  def down
    raise ActiveRecord::IrreversibleMigration
  end
end