puppetlabs/puppet · error · ArgumentError

MergeStrategies.add_strategy 'strategy_class' must be a 'Mer

Error message

MergeStrategies.add_strategy 'strategy_class' must be a 'MergeStrategy' class. Got %{strategy_class}

What it means

Error "MergeStrategies.add_strategy 'strategy_class' must be a 'MergeStrategy' class. Got %{strategy_class}" thrown in puppetlabs/puppet.

Source

Thrown at lib/puppet/pops/merge_strategy.rb:60

      merge_options == EMPTY_HASH ? strategy_class::INSTANCE : strategy_class.new(merge_options)
    end

    # Returns the list of merge strategy keys known to this class
    #
    # @return [Array<Symbol>] List of strategy keys
    #
    def self.strategy_keys
      strategies.keys - [:default, :unconstrained_deep, :reverse_deep]
    end

    # Adds a new merge strategy to the map of strategies known to this class
    #
    # @param strategy_class [Class<MergeStrategy>] The class of the added strategy
    #
    def self.add_strategy(strategy_class)
      unless MergeStrategy > strategy_class
        # TRANSLATORS 'MergeStrategies.add_strategy' is a method, 'stratgey_class' is a variable and 'MergeStrategy' is a class name and should not be translated
        raise ArgumentError, _("MergeStrategies.add_strategy 'strategy_class' must be a 'MergeStrategy' class. Got %{strategy_class}") %
                             { strategy_class: strategy_class }
      end
      strategies[strategy_class.key] = strategy_class
      nil
    end

    # Finds a merge strategy that corresponds to the given _merge_ argument and delegates the task of merging the elements of _e1_ and _e2_ to it.
    #
    # @param e1 [Object] The first element
    # @param e2 [Object] The second element
    # @return [Object] The result of the merge
    #
    def self.merge(e1, e2, merge)
      strategy(merge).merge(e1, e2)
    end

    def self.key
      raise NotImplementedError, "Subclass must implement 'key'"

View on GitHub (pinned to e227c27540)

When it happens

Trigger: Thrown at lib/puppet/pops/merge_strategy.rb:60 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of puppetlabs/puppet@e227c27540 (2026-08-21). Data as JSON: /api/errors/ce3c57636918441c. Report an issue: GitHub.