fix: Adjust min/max items to valid lengths for Set[Enum] fields

polyfactory/value_generators/constrained_collections.py

@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+from enum import EnumMeta
 from typing import TYPE_CHECKING, Any, Callable, List, Mapping, TypeVar, cast
 
 from polyfactory.exceptions import ParameterException
@@ -39,6 +40,11 @@ def handle_constrained_collection(
     min_items = abs(min_items if min_items is not None else (max_items or 0))
     max_items = abs(max_items if max_items is not None else min_items + 1)
 
+    if isinstance(field_meta.annotation, EnumMeta):
+        max_items = len(field_meta.annotation)
+        if min_items > max_items:
+            min_items = max_items
+
     if max_items < min_items:
         msg = "max_items must be larger or equal to min_items"
         raise ParameterException(msg)

tests/test_complex_types.py

@@ -155,6 +155,25 @@ class MyFactory(ModelFactory):
     assert result.animal_list
 
 
+def test_complex_typing_with_enum_set() -> None:
+    class Animal(str, Enum):
+        DOG = "Dog"
+        CAT = "Cat"
+        MONKEY = "Monkey"
+
+    class MyModel(BaseModel):
+        animal_list: Set[Animal]
+
+    class MyFactory(ModelFactory):
+        __model__ = MyModel
+        __randomize_collection_length__ = True
+        __min_collection_length__ = len(Animal) + 1
+        __min_collection_length__ = len(Animal) + 2
+
+    result = MyFactory.build()
+    assert len(result.animal_list) == len(Animal)
+
+
 def test_union_literal() -> None:
     class MyModel(BaseModel):
         x: Union[int, Literal["a", "b", "c"]]