An assignment of property including choses in action, by a debtor for the benefit of creditors shall be in writing and signed by the debtor. If real estate is assigned, it shall be by deed, executed and recorded in the same manner as a conveyance of real estate. Such assignment shall be for the benefit of all the creditors of the assignor in proportion to their respective claims. An assignment shall not be valid against a creditor of the assignor, if the assignee is a creditor or interested in the provisions of the assignment.