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# frozen_string_literal: true
# When a user is destroyed, some of their associated records are
# moved to a "Ghost User", to prevent these associated records from
# being destroyed.
#
# For example, all the issues/MRs a user has created are _not_ destroyed
# when the user is destroyed.
module Users
class MigrateToGhostUserService
extend ActiveSupport::Concern
attr_reader :ghost_user, :user, :hard_delete
def initialize(user)
@user = user
@ghost_user = User.ghost
end
# If an admin attempts to hard delete a user, in some cases associated
# records may have a NOT NULL constraint on the user ID that prevent that record
# from being destroyed. In such situations we must assign the record to the ghost user.
# Passing in `hard_delete: true` will ensure these records get assigned to
# the ghost user before the user is destroyed. Other associated records will be destroyed.
# letting the other associated records be destroyed.
def execute(hard_delete: false)
@hard_delete = hard_delete
transition = user.block_transition
# Block the user before moving records to prevent a data race.
# For example, if the user creates an issue after `migrate_issues`
# runs and before the user is destroyed, the destroy will fail with
# an exception.
user.block
begin
user.transaction do
migrate_records
end
rescue Exception # rubocop:disable Lint/RescueException
# Reverse the user block if record migration fails
if transition
transition.rollback
user.save!
end
raise
end
user.reset
end
private
def migrate_records
return if hard_delete
migrate_issues
migrate_merge_requests
migrate_notes
migrate_abuse_reports
migrate_award_emoji
migrate_snippets
migrate_reviews
end
# rubocop: disable CodeReuse/ActiveRecord
def migrate_issues
batched_migrate(Issue, :author_id)
batched_migrate(Issue, :last_edited_by_id)
end
# rubocop: enable CodeReuse/ActiveRecord
# rubocop: disable CodeReuse/ActiveRecord
def migrate_merge_requests
batched_migrate(MergeRequest, :author_id)
batched_migrate(MergeRequest, :merge_user_id)
end
# rubocop: enable CodeReuse/ActiveRecord
def migrate_notes
batched_migrate(Note, :author_id)
end
def migrate_abuse_reports
user.reported_abuse_reports.update_all(reporter_id: ghost_user.id)
end
def migrate_award_emoji
user.award_emoji.update_all(user_id: ghost_user.id)
end
def migrate_snippets
snippets = user.snippets.only_project_snippets
snippets.update_all(author_id: ghost_user.id)
end
def migrate_reviews
batched_migrate(Review, :author_id)
end
# rubocop:disable CodeReuse/ActiveRecord
def batched_migrate(base_scope, column)
loop do
update_count = base_scope.where(column => user.id).limit(100).update_all(column => ghost_user.id)
break if update_count == 0
end
end
# rubocop:enable CodeReuse/ActiveRecord
end
end
Users::MigrateToGhostUserService.prepend_mod_with('Users::MigrateToGhostUserService')
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