fix: respect override of optional nested model fields

polyfactory/factories/base.py

@@ -559,7 +559,7 @@ def get_field_value(  # noqa: C901, PLR0911, PLR0912
         if cls.is_ignored_type(field_meta.annotation):
             return None
 
-        if cls.should_set_none_value(field_meta=field_meta):
+        if field_build_parameters is None and cls.should_set_none_value(field_meta=field_meta):
             return None
 
         unwrapped_annotation = unwrap_annotation(field_meta.annotation, random=cls.__random__)

tests/test_passing_build_args_to_child_factories.py

@@ -3,6 +3,7 @@
 from pydantic import BaseModel
 
 from polyfactory.factories.pydantic_factory import ModelFactory
+from polyfactory.field_meta import FieldMeta
 
 
 class Address(BaseModel):
@@ -176,3 +177,22 @@ class DFactory(ModelFactory):
     build_result = DFactory.build(factory_use_construct=False, **{"c": {"b": {"a": {"name": "test"}}}})
     assert build_result
     assert build_result.c.b.a.name == "test"
+
+
+def test_factory_with_nested_optional_field_overrides_in_dict() -> None:
+    class MyChildModel(BaseModel):
+        name: str
+
+    class MyParentModel(BaseModel):
+        child: Optional[MyChildModel]
+
+    class MyParentModelFactory(ModelFactory):
+        __model__ = MyParentModel
+
+        @classmethod
+        def should_set_none_value(cls, field_meta: FieldMeta) -> bool:
+            return True
+
+    result = MyParentModelFactory.build(child={"name": "test"})
+    assert result.child is not None
+    assert result.child.name == "test"