Rails AR. validate one field, with 4 validators & 2 condition block

validates :inn,
          presence: { if: -> { user.is_a?(Client) } },
          inn: { if: -> { user.is_a?(Client) } },
          uniqueness: { if: -> { user.is_a?(Client) } },
          absence: { if: -> { user.is_a?(Department) } }

Could I have some tips on refactoring this?