instance method prepare_all

# File activerecord/lib/active_record/tasks/database_tasks.rb, line 174
      def prepare_all
        seed = false
        dump_db_configs = []

        each_current_configuration(env) do |db_config|
          database_initialized = initialize_database(db_config)

          seed = true if database_initialized && db_config.seeds?
        end

        each_current_environment(env) do |environment|
          db_configs_with_versions(environment).sort.each do |version, db_configs|
            dump_db_configs |= db_configs

            db_configs.each do |db_config|
              with_temporary_pool(db_config) do
                migrate(version)
              end
            end
          end
        end

        # Dump schema for databases that were migrated.
        if ActiveRecord.dump_schema_after_migration
          dump_db_configs.each do |db_config|
            with_temporary_pool(db_config) do
              dump_schema(db_config)
            end
          end
        end

        load_seed if seed
      end