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# 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::MigrateToGhostUser
extend ActiveSupport::Concern
attr_reader :ghost_user
def move_associated_records_to_ghost_user(user)
# Block the user before moving records to prevent a data race.
# For example, if the user creates an issue after `move_issues_to_ghost_user`
# runs and before the user is destroyed, the destroy will fail with
# an exception.
user.block
user.transaction do
@ghost_user = User.ghost
move_issues_to_ghost_user(user)
move_merge_requests_to_ghost_user(user)
end
user.reload
end
private
def move_issues_to_ghost_user(user)
user.issues.update_all(author_id: ghost_user.id)
end
def move_merge_requests_to_ghost_user(user)
user.merge_requests.update_all(author_id: ghost_user.id)
end
end
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