Class: AmplitudeExperiment::AssignmentService

Inherits:
Object
  • Object
show all
Defined in:
lib/experiment/local/assignment/assignment_service.rb

Overview

AssignmentService

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(amplitude, assignment_filter) ⇒ AssignmentService

Returns a new instance of AssignmentService.



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# File 'lib/experiment/local/assignment/assignment_service.rb', line 5

def initialize(amplitude, assignment_filter)
  @amplitude = amplitude
  @assignment_filter = assignment_filter
end

Class Method Details

.to_event(assignment) ⇒ Object 



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# File 'lib/experiment/local/assignment/assignment_service.rb', line 14

def self.to_event(assignment)
  event = AmplitudeAnalytics::BaseEvent.new(
    '[Experiment] Assignment',
    user_id: assignment.user.user_id,
    device_id: assignment.user.device_id,
    event_properties: {},
    user_properties: {}
  )

  set = {}
  unset = {}

  assignment.results.sort.to_h.each do |flag_key, variant|
    next unless variant.key

    version = variant.metadata['flagVersion'] if variant.metadata
    segment_name = variant.metadata['segmentName'] if variant.metadata
    flag_type = variant.metadata['flagType'] if variant.metadata
    default = variant.metadata ? variant.metadata.fetch('default', false) : false
    event.event_properties["#{flag_key}.variant"] = variant.key
    event.event_properties["#{flag_key}.details"] = "v#{version} rule:#{segment_name}" if version && segment_name
    next if flag_type == FLAG_TYPE_MUTUAL_EXCLUSION_GROUP

    if default
      unset["[Experiment] #{flag_key}"] = '-'
    else
      set["[Experiment] #{flag_key}"] = variant.key
    end
  end
  event.user_properties['$set'] = set
  event.user_properties['$unset'] = unset
  event.insert_id = "#{event.user_id} #{event.device_id} #{AmplitudeExperiment.hash_code(assignment.canonicalize)} #{assignment.timestamp / DAY_MILLIS}"
  event
end

Instance Method Details

#track(assignment) ⇒ Object 



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# File 'lib/experiment/local/assignment/assignment_service.rb', line 10

def track(assignment)
  @amplitude.track(AssignmentService.to_event(assignment)) if @assignment_filter.should_track(assignment)
end