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# frozen_string_literal: true
class Experiment < ApplicationRecord
has_many :experiment_users
has_many :experiment_subjects, inverse_of: :experiment
validates :name, presence: true, uniqueness: true, length: { maximum: 255 }
def self.add_user(name, group_type, user, context = {})
find_or_create_by!(name: name).record_user_and_group(user, group_type, context)
end
def self.add_group(name, variant:, group:)
add_subject(name, variant: variant, subject: group)
end
def self.add_subject(name, variant:, subject:)
find_or_create_by!(name: name).record_subject_and_variant!(subject, variant)
end
def self.record_conversion_event(name, user, context = {})
find_or_create_by!(name: name).record_conversion_event_for_user(user, context)
end
# Create or update the recorded experiment_user row for the user in this experiment.
def record_user_and_group(user, group_type, context = {})
experiment_user = experiment_users.find_or_initialize_by(user: user)
experiment_user.assign_attributes(group_type: group_type, context: merged_context(experiment_user, context))
# We only call save when necessary because this causes the request to stick to the primary DB
# even when the save is a no-op
# https://gitlab.com/gitlab-org/gitlab/-/issues/324649
experiment_user.save! if experiment_user.changed?
experiment_user
end
def record_conversion_event_for_user(user, context = {})
experiment_user = experiment_users.find_by(user: user)
return unless experiment_user
experiment_user.update!(converted_at: Time.current, context: merged_context(experiment_user, context))
end
def record_subject_and_variant!(subject, variant)
raise 'Incompatible subject provided!' unless ExperimentSubject.valid_subject?(subject)
attr_name = subject.class.table_name.singularize.to_sym
experiment_subject = experiment_subjects.find_or_initialize_by(attr_name => subject)
experiment_subject.assign_attributes(variant: variant)
# We only call save when necessary because this causes the request to stick to the primary DB
# even when the save is a no-op
# https://gitlab.com/gitlab-org/gitlab/-/issues/324649
experiment_subject.save! if experiment_subject.changed?
experiment_subject
end
private
def merged_context(experiment_user, new_context)
experiment_user.context.deep_merge(new_context.deep_stringify_keys)
end
end
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