fix: missing 0x on ContractLog.transaction_hash (#2501)

src/ape/types/events.py

@@ -6,7 +6,7 @@
 from eth_abi.packed import encode_packed
 from eth_pydantic_types import HexBytes
 from eth_typing import Hash32, HexStr
-from eth_utils import encode_hex, keccak, to_hex
+from eth_utils import encode_hex, is_hex, keccak, to_hex
 from ethpm_types.abi import EventABI
 from pydantic import BaseModel, field_serializer, field_validator, model_validator
 from web3.types import FilterParams
@@ -193,6 +193,18 @@ class ContractLog(ExtraAttributesMixin, BaseContractLog):
     Is `None` when from the pending block.
     """
 
+    @field_validator("transaction_hash", mode="before")
+    @classmethod
+    def _validate_transaction_hash(cls, transaction_hash):
+        if (
+            isinstance(transaction_hash, str)
+            and is_hex(transaction_hash)
+            and not transaction_hash.startswith("0x")
+        ):
+            return f"0x{transaction_hash}"
+
+        return transaction_hash
+
     @field_serializer("transaction_hash", "block_hash")
     def _serialize_hashes(self, value, info):
         return self._serialize_value(value, info)

tests/functional/test_contract_event.py

@@ -471,3 +471,17 @@ def test_model_dump_json():
         '"MyEvent","log_index":0,'
         '"transaction_hash":"0x00000000000000000000000004d21f074916369e"}'
     )
+
+
+def test_transaction_hash():
+    event_arguments = {"key": 123, "validators": [HexBytes(123)]}
+    txn_hash = "a3430927834bd23"
+    event = ContractLog(
+        block_number=123,
+        block_hash="block-hash",
+        event_arguments=event_arguments,
+        event_name="MyEvent",
+        log_index=0,
+        transaction_hash=txn_hash,
+    )
+    assert event.transaction_hash == f"0x{txn_hash}"