Subject to the provisions of this Code, all persons having an interest either in the mortgage-security or in the right of redemption shall be joined as parties to any suit relating to the mortgage. Explanation.-A puisne mortgagee may sue for foreclosure or for sale without making the prior mortgagee a party to the suit; and a prior mortgage need not be joined in a suit to redeem a subsequent mortgage.

Subject to the provisions of this Code, all persons having an interest either in the mortgage-security or in the right of redemption shall be joined as parties to any suit relating to the mortgage. Explanation.-A puisne mortgagee may sue for foreclosure or for sale without making the prior mortgagee a party to the suit; and a prior mortgage need not be joined in a suit to redeem a subsequent mortgage.