Cal. Pub. Contract Code § 20461
No assignment by the contractor of the whole or any part of the money, assessment, partial assessment, any reassessment and any bonds which may be issued to represent any assessment or reassessment, due or to be due under the contract, or for "extras" in connection therewith, whether made before or after a verified claim is filed pursuant to this chapter, shall take priority over the claims, and the assignment shall have no binding force insofar as the rights of the claimants, or their assigns, are concerned. None of the provisions of Title 3 (commencing with Section 9000) of Part 6 of Division 4 of the Civil Code shall be applicable to any assessment, partial assessment, reassessment, bonds, moneys or funds payable to the contractor or assignee under this division or to any matter contained in this chapter.
Ca. Pub. Cont. Code § 20461