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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
records = project.send(self.class.name.tableize)
records = records.with_deleted if self.paranoid?
max_iid = records.maximum(:iid)
self.iid = max_iid.to_i + 1
end
def to_param
iid.to_s
end
end
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