Update utils/instructor.py

utils/instructor.py

@@ -1,4 +1,4 @@
-from typing_extensions import Self, Optional, Union
+from typing_extensions import Self, Optional
 from pydantic import model_validator
 from sqlmodel import Field, Relationship
 
@@ -12,13 +12,13 @@ class Instructor(Person, table=True):
     Represents an Instructor, inheriting from Person, with an additional department field.
 
     Attributes:
-        department (Union[str, Department): The  instructor's department.
+        department (str): The  instructor's department.
 
     Methods:
         set_id() -> Self: An SQLmodel validator that automatically sets the instructor's ID with a "INS" prefix through handle_id method in the Person class.
     """
 
-    department: Union[str, Department] = Field(default=Department.COMPUTER_SCIENCE)
+    department: str = Field(default=Department.COMPUTER_SCIENCE)
 
     course_id: Optional[str] = Field(
         default=None, foreign_key="course.id")