gitlab-org--gitlab-foss/app/models/concerns/internal_id.rb

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module InternalId
extend ActiveSupport::Concern
included do
validate :set_iid, on: :create
validates :iid, presence: true, numericality: true
end
def set_iid
max_iid = project.send(self.class.name.tableize).maximum(:iid)
self.iid = max_iid.to_i + 1
end
def to_param
iid.to_s
end
end