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module ActiveRecord
  module ConnectionAdapters
    module PostgreSQL
      module ColumnDumper
        def column_spec_for_primary_key(column)
          spec = super
          if schema_type(column) == :uuid
            spec[:default] ||= "nil"
          end
          spec
        end

        # Adds +:array+ option to the default set
        def prepare_column_options(column)
          spec = super
          spec[:array] = "true" if column.array?
          spec
        end

        # Adds +:array+ as a valid migration key
        def migration_keys
          super + [:array]
        end

        private

        def default_primary_key?(column)
          schema_type(column) == :serial
        end

        def schema_type(column)
          return super unless column.serial?

          if column.bigint?
            :bigserial
          else
            :serial
          end
        end

        def schema_expression(column)
          super unless column.serial?
        end
      end
    end
  end
end