Fix Get Literal Type Error for Attribute Access Compile in Flyteprope…

…ller (#2749)

Signed-off-by: Future-Outlier <eric901201@gmail.com>

flytekit/core/type_engine.py

@@ -476,10 +476,13 @@ def get_literal_type(self, t: Type[T]) -> LiteralType:
         # Recursively construct the dataclass_type which contains the literal type of each field
         literal_type = {}
 
+        hints = typing.get_type_hints(t)
         # Get the type of each field from dataclass
         for field in t.__dataclass_fields__.values():  # type: ignore
             try:
-                literal_type[field.name] = TypeEngine.to_literal_type(field.type)
+                name = field.name
+                python_type = hints.get(name, field.type)
+                literal_type[name] = TypeEngine.to_literal_type(python_type)
             except Exception as e:
                 logger.warning(
                     "Field {} of type {} cannot be converted to a literal type. Error: {}".format(

tests/flytekit/unit/core/test_type_engine.py

@@ -2860,9 +2860,25 @@ class MyDataClass:
     assert literal_type is not None
 
     invalid_json_str = "{ unbalanced_braces"
+
     with pytest.raises(Exception):
         Literal(scalar=Scalar(generic=_json_format.Parse(invalid_json_str, _struct.Struct())))
 
+    @dataclass
+    class Fruit(DataClassJSONMixin):
+        name: str
+
+    @dataclass
+    class NestedFruit(DataClassJSONMixin):
+        sub_fruit: Fruit
+        name: str
+
+    literal_type = de.get_literal_type(NestedFruit)
+    dataclass_type = literal_type.structure.dataclass_type
+    assert dataclass_type["sub_fruit"].simple == SimpleType.STRUCT
+    assert dataclass_type["sub_fruit"].structure.dataclass_type["name"].simple == SimpleType.STRING
+    assert dataclass_type["name"].simple == SimpleType.STRING
+
 
 def test_DataclassTransformer_to_literal():
     @dataclass