feat: allow creating LogFilter object from Nones (coercing to empty list / dict when possible) (#2506)

Author: antazoey

src/ape/types/events.py

@@ -38,7 +38,7 @@ class LogFilter(BaseModel):
     @classmethod
     def compute_selectors(cls, values):
         values["selectors"] = {
-            encode_hex(keccak(text=event.selector)): event for event in values.get("events", [])
+            encode_hex(keccak(text=event.selector)): event for event in values.get("events") or []
         }
 
         return values
@@ -48,6 +48,16 @@ def compute_selectors(cls, values):
     def validate_start_block(cls, value):
         return value or 0
 
+    @field_validator("addresses", "events", "topic_filter", mode="before")
+    @classmethod
+    def _convert_none_to_empty_list(cls, value):
+        return value or []
+
+    @field_validator("selectors", mode="before")
+    @classmethod
+    def _convert_none_to_dict(cls, value):
+        return value or {}
+
     def model_dump(self, *args, **kwargs):
         _Hash32 = Union[Hash32, HexBytes, HexStr]
         topics = cast(Sequence[Optional[Union[_Hash32, Sequence[_Hash32]]]], self.topic_filter)

tests/functional/test_types.py

@@ -117,6 +117,16 @@ def test_topic_filter_encoding():
     ]
 
 
+def test_log_filter_model_validate_coerces_nones():
+    log_filter = LogFilter.model_validate(
+        {"addresses": None, "events": None, "topic_filter": None, "selectors": None}
+    )
+    assert log_filter.addresses == []
+    assert log_filter.events == []
+    assert log_filter.topic_filter == []
+    assert log_filter.selectors == {}
+
+
 def test_address_type(owner):
     class MyModel(BaseModel):
         addr: AddressType