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CHANGELOG.md

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v0.16.1

  • Change RedisStorage scrub to be iterative to avoid SystemStackError while cleaning big experiments

v0.16.0

  • Allow configuring the RedisStorage with a ConnectionPool instead of a raw Redis connection.

v0.15.2

  • Fix edge case where inheriting from Verdict::Experiment and overriding subject_qualifies? resulted in an error.

v0.15.1

  • Make the dynamic_qualifies parameter in Verdict::Experiment#subject_qualifies? optional. This fixes a bug where users that were previously calling this method directly experienced issues after v0.15.0

v0.15.0

  • Add optional qualifiers parameter to the Verdict::Experiment#switch method. This parameter accepts an array of procs and is used as additional qualifiers. The purpose of this parameter is to allow users to define qualification logic outside of the experiment definition.

v0.14.0

  • Add optional experiment definition method schedule_stop_new_assignment_timestamp to support limiting experiment's assignment lifetime with another pre-determined time interval. It allows users to have an assignment cooldown period for stable analysis of the experiment results. Experiment's lifetime now becomes: start experiment -> stop new assignments -> end experiment.

v0.13.0

  • Add optional experiment definition methods schedule_start_timestamp and schedule_end_timestamp to support limiting experiment's lifetime in a pre-determined time interval.
  • Support eager loading from within a Rails app using Zeitwerk.
  • Add CookieStorage storage backend. This backend is a distributed store for Verdict and does not support experiment timestamps. It is designed to be used with Rails applications and requires that .cookies be set to the CookieJar instance before use.

v0.12.0

  • Allow options to be passed to Experiment#cleanup so they can be forwarded to storage.

  • Changed Experiment#cleanup to accept an argument of type Verdict::Experiment. Passing a String/Symbol argument is still supported, but will log a deprecation warning.

v0.11.0

  • Automatic eager loading when inside a Rails app.

v0.10.0

  • Add Experiment#cleanup to remove stored redis hashes.
  • Fix typo in Experiment#fetch_subject error message.

v0.9.0

This version has breaking changes

  • Eagerly load experiment definitions when booting Rails, so that multi-threaded applications do not face a race-condition when populating experiments.
  • Fixes deprecated assert_equal tests that return nil.

v0.8.0

This version has breaking changes

  • Experiments that have store_unqualified set to false will now have previous assignments loaded on assign regardless of whether or not the merchant no longer qualifies
  • Here's the change in logic for assign based on whether or not the store_unqualified flag is on:

Old behaviour:

store_unqualified true false
assignments for subjects that don't qualify are persisted in the database yes no
existing assignments are returned (even if subject doesn't qualify anymore) yes no

New behaviour:

store_unqualified true false
assignments for subjects that don't qualify are persisted in the database yes no
existing assignments are returned (even if subject doesn't qualify anymore) yes yes

v0.7.0

This version has breaking changes

  • Experiment can now specify multiple qualify blocks
    • Verdict::Experiment#qualifier has been removed in favor for Verdict::Experiment#qualifiers, which returns an array of procs
  • Allow pass of an argument to qualify with a method name as a symbol, instead of a block

v0.6.3

  • Fix bug were Verdict.directory is overwritten
  • Allow Verdict.directory to handle multiple directories (using globbing)

v0.6.2

  • Implement Verdict.clear_repository_cache, which fixes autoloading issues with Rails.
  • Integrated Verdict.clear_repository_cache with our Railtie.

v0.6.1

  • Make Verdict Railtie .freeze the eager_load_paths it changes as Rails itself does.

v0.6.0

This version has breaking changes

Verdict::Experiment

  • replaced following public methods that took a subject_identifier with an equivalent method which takes a subject
old method new method
lookup_assignment_for_identifier(subject_identifier) lookup(subject)
assign_manually_by_identifier(subject_identifier, group) assign_manually(subject, group)
disqualify_manually_by_identifier(subject_identifier) disqualify_manually(subject)
remove_subject_assignment_by_identifier(subject_identifier) remove_subject_assignment(subject)
fetch_assignment(subject_identifier) lookup(subject)
  • Changed the following methods to take a subject instead of subject_identifier
  • subject_assignment(subject, group, originally_created_at = nil, temporary = false)
  • subject_conversion(subject, goal, created_at = Time.now.utc)

Improved Testability

Verdict::Experiment#subject_qualifies?(subject, context = nil) is now public, so it's easier to test the qualification logic for your experiments.

Verdict::BaseStorage

  • BaseStorage's public methods now take a subject, instead of a subject_identifier. They fetch the subject_identifier using the Experiment#subject_identifier(subject) method. Existing storages will still work normally.
  • The basic #get,#set, and #remove methods are now protected.

Verdict::Assignment

  • #initialize now takes a subject instead of a subject_identifier, the new signature is initialize(experiment, subject, group, originally_created_at, temporary = false)

Verdict::Conversion

  • #initialize now takes a subject instead of a subject_identifier, the new signature is initialize(experiment, subject, goal, created_at = Time.now.utc)

Rake Tasks

  • In order to use the included helper Rake Tasks, you must implement fetch_subject(subject_identifier) in Experiment.

Unsupported Ruby Versions

Support has been removed for the following Ruby versions:

  • 1.9.X
  • Rubinius