How to create a contract which would delegate XTZs and receive rewards?

Question

I am trying to write a contract that receives rewards from the baker using a default entry point and should only allow me to change the baker from a different entry point.

I am using the smartpy tool to write a contract.

import smartpy as sp

class DelegateAndRewards(sp.Contract):
    
    def __init__(self,admin):
        self.init(admin = admin)
    
    @sp.entry_point
    def default(self):
        sp.verify(sp.amount > sp.mutez(0))
    
    @sp.entry_point
    def setDelegation(self,params):
        sp.verify(sp.sender == self.data.admin)
        sp.set_delegate(params.baker)
    
@sp.add_test(name="test")

def test():
     obj = DelegateAndRewards(admin = sp.address("tz1a4UNywaxaAfh2LRBP2UugQTeCVcLCn5Sa"))
     scenario = sp.test_scenario()
     scenario += obj

This contract gets originated (KT1Qk5To61kToEbfPPbsaCvAE8xt3fDMHF6B) but fails at invocation of "setDelegation" entry point.

If you change the name of the "default" entry point to something like "getRewardsFromBaker" (KT1B3J5EHQM92GZH9hRJjAn7Rab16unLoHLx). Things would work fine but I am not sure whether the baker would be able to transfer rewards. If yes then how?

Thanks in advance.

Answer 1

Looking at the failed operation at https://better-call.dev/carthagenet/KT1Qk5To61kToEbfPPbsaCvAE8xt3fDMHF6B/operations, it seems the problem lies in the way you try to call the getRewardsFromBaker entrypoint. Which tool did you use to build this failed transaction?