класс ActiveRecord::NoDatabaseError

# File activerecord/lib/active_record/errors.rb, line 319
      def db_error(db_name)
        NoDatabaseError.new(<<~MSG)
          We could not find your database: #{db_name}. Available database configurations can be found in config/database.yml file.

          To resolve this error:

          - Did you create the database for this app, or delete it? You may need to create your database.
          - Has the database name changed? Check your database.yml config has the correct database name.

          To create your database, run:\n\n        bin/rails db:create
        MSG
      end

# File activerecord/lib/active_record/errors.rb, line 314
def initialize(message = nil, connection_pool: nil)
  super(message || "Database not found", connection_pool: connection_pool)
end