db_config

# File railties/lib/rails/commands/dbconsole/dbconsole_command.rb, line 23
    def db_config
      @db_config ||= begin
        # If the user provided a database, use that. Otherwise find
        # the first config in the database.yml
        config = if database
          @db_config = configurations.configs_for(env_name: environment, name: database, include_hidden: true)
        else
          @db_config = configurations.find_db_config(environment)
        end

        unless config
          missing_db = database ? "'#{database}' database is not" : "No databases are"
          raise ActiveRecord::AdapterNotSpecified,
            "#{missing_db} configured for '#{environment}'. Available configuration: #{configurations.inspect}"
        end

        config.validate!
        config
      end
    end