Method: Optimizely::DecisionService#get_variation_for_feature_experiment

Defined in:

lib/optimizely/decision_service.rb

#get_variation_for_feature_experiment(project_config, feature_flag, user_id, attributes = nil, decide_options = []) ⇒ Object

# File 'lib/optimizely/decision_service.rb', line 160

def get_variation_for_feature_experiment(project_config, feature_flag, user_id, attributes = nil, decide_options = [])
  # Gets the variation the user is bucketed into for the feature flag's experiment.
  #
  # project_config - project_config - Instance of ProjectConfig
  # feature_flag - The feature flag the user wants to access
  # user_id - String ID for the user
  # attributes - Hash representing user attributes
  #
  # Returns Decision struct (nil if the user is not bucketed into any of the experiments on the feature)
  # or nil if the user is not bucketed into any of the experiments on the feature
  decide_reasons = []
  feature_flag_key = feature_flag['key']
  if feature_flag['experimentIds'].empty?
    message = "The feature flag '#{feature_flag_key}' is not used in any experiments."
    @logger.log(Logger::DEBUG, message)
    decide_reasons.push(message)
    return nil, decide_reasons
  end

  # Evaluate each experiment and return the first bucketed experiment variation
  feature_flag['experimentIds'].each do |experiment_id|
    experiment = project_config.experiment_id_map[experiment_id]
    unless experiment
      message = "Feature flag experiment with ID '#{experiment_id}' is not in the datafile."
      @logger.log(Logger::DEBUG, message)
      decide_reasons.push(message)
      return nil, decide_reasons
    end

    experiment_id = experiment['id']
    variation_id, reasons_received = get_variation(project_config, experiment_id, user_id, attributes, decide_options)
    decide_reasons.push(*reasons_received)

    next unless variation_id

    variation = project_config.get_variation_from_id_by_experiment_id(experiment_id, variation_id)

    return Decision.new(experiment, variation, DECISION_SOURCES['FEATURE_TEST']), decide_reasons
  end

  message = "The user '#{user_id}' is not bucketed into any of the experiments on the feature '#{feature_flag_key}'."
  @logger.log(Logger::INFO, message)
  decide_reasons.push(message)

  [nil, decide_reasons]
end