класс ActiveRecord::NoDatabaseError

# File activerecord/lib/active_record/errors.rb, line 250
      def db_error(db_name)
        NoDatabaseError.new(<<~MSG)
          We could not find your database: #{db_name}. Which can be found in the database configuration file located at config/database.yml.

          To resolve this issue:

          - 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 245
def initialize(message = nil)
  super(message || "Database not found")
end