db_config

# File railties/lib/rails/commands/dbconsole/dbconsole_command.rb, line 98
    def db_config
      return @db_config if defined?(@db_config)

      # We need to check whether the user passed the database the
      # first time around to show a consistent error message to people
      # relying on 2-level database configuration.

      @db_config = configurations.configs_for(env_name: environment, name: database)

      unless @db_config
        raise ActiveRecord::AdapterNotSpecified,
          "'#{database}' database is not configured for '#{environment}'. Available configuration: #{configurations.inspect}"
      end

      @db_config
    end