DatabaseCleaner/database_cleaner · error · UnknownStrategySpecified

The '#{strategy}' strategy does not exist for the #{orm} ORM

Error message

The '#{strategy}' strategy does not exist for the #{orm} ORM!  Available strategies: #{available_strategies.join(', ')}

What it means

Error "The '#{strategy}' strategy does not exist for the #{orm} ORM! Available strategies: #{available_strategies.join(', ')}" thrown in DatabaseCleaner/database_cleaner.

Source

Thrown at lib/database_cleaner/cleaner.rb:93

    def set_strategy_db(strategy, desired_db)
      if strategy.respond_to? :db=
        strategy.db = desired_db
      elsif desired_db != :default
        raise ArgumentError, "You must provide a strategy object that supports non default databases when you specify a database"
      end
    end

    def create_strategy(*args)
      strategy, *strategy_args = args
      orm_strategy(strategy).new(*strategy_args)
    end

    def orm_strategy(strategy)
      strategy_module_name = camelize(strategy)
      orm_module.const_get(strategy_module_name)
    rescue NameError
      available_strategies = self.class.available_strategies(orm_module)
      raise UnknownStrategySpecified, "The '#{strategy}' strategy does not exist for the #{orm} ORM!  Available strategies: #{available_strategies.join(', ')}"
    end

    def orm_module
      orm_module_name = camelize(orm)
      DatabaseCleaner.const_get(orm_module_name)
    end

    # copied from ActiveSupport to avoid adding it as a dependency

    def camelize(term)
      string = term.to_s
      string = string.sub(/^[a-z\d]*/) { |match| match.capitalize }
      string.gsub!(/(?:_|(\/))([a-z\d]*)/i) { "#{$1}#{$2.capitalize}" }
      string.gsub!("/", "::")
      string
    end

    def self.underscore(camel_cased_word)

View on GitHub (pinned to 09b47d03cc)

When it happens

Trigger: Thrown at lib/database_cleaner/cleaner.rb:93 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of DatabaseCleaner/database_cleaner@09b47d03cc (2026-08-23). Data as JSON: /api/errors/6ebb05d24f9db01b. Report an issue: GitHub.