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