Method: TrailGuide::Experiments::Enrollment#choose_variant!

Defined in:
lib/trail_guide/experiments/enrollment.rb

#choose_variant!(override: nil, excluded: false, metadata: nil) ⇒ Object 



20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
 
# File 'lib/trail_guide/experiments/enrollment.rb', line 20

def choose_variant!(override: nil, excluded: false, metadata: nil)
  return control if TrailGuide.configuration.disabled

  if override.present?
    variant = variants.find { |var| var == override } || control
    if running? && !is_combined?
      variant.increment_participation! if configuration.track_override
      participant.participating!(variant) if configuration.store_override
    end
    return variant
  end

  if winner?
    variant = winning_variant
    if track_winner_conversions? && running?
      variant.increment_participation! unless participant.variant == variant
      participant.exit! if participant.participating? && participant.variant != variant
      participant.participating!(variant)
    end
    return variant
  end

  return control if excluded || stopped?

  if !started? && start_manually?
    if enable_calibration?
      unless participant.variant == control
        control.increment_participation!
        parent.control.increment_participation! if is_combined?
      end

      if participant.participating? && participant.variant != control
        participant.exit!
        parent.participant.exit! if is_combined?
      end

      participant.participating!(control)
      parent.participant.participating!(parent.control) if is_combined?
    end
    return control
  end

  start! unless started? || scheduled?
  return control unless running?

  # only re-use the variant for experiments that store participation,
  # all other (i.e. content-based) experiments should re-select and
  # re-assign on enrollment
  if configuration.sticky_assignment? && participant.participating?
    variant = participant.variant
    participant.participating!(variant) if track_participation?(metadata)
    return variant
  end

  return control unless is_combined? || TrailGuide.configuration.allow_multiple_experiments == true || !participant.participating_in_active_experiments?(TrailGuide.configuration.allow_multiple_experiments == false)
  return control unless allow_participation?(metadata)

  variant = algorithm_choose!(metadata: metadata)
  if track_participation?(metadata)
    variant.increment_participation!
    participant.participating!(variant)
  end
  run_callbacks(:on_choose, variant, participant, metadata)
  variant
end