activerecord/lib/active_record/connection_adapters/postgresql/column.rb


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module ActiveRecord
  module ConnectionAdapters
    # PostgreSQL-specific extensions to column definitions in a table.
    class PostgreSQLColumn < Column #:nodoc:
      delegate :array, :oid, :fmod, to: :sql_type_metadata
      alias :array? :array

      def serial?
        return unless default_function

        %r{\Anextval\('"?#{table_name}_#{name}_seq"?'::regclass\)\z} === default_function
      end
    end
  end
end