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from typing import List
from sqlmodel import SQLModel, Field, Relationship
from utils.enums.course_name_id import CourseNameId
from .instructor import Instructor
from .enrollment import Enrollment
class Course(SQLModel, table=True):
"""
Represents a course, including its name, unique identifier, enrolled students, and instructors.
Attributes:
id (str): A unique identifier for the course.
course_name (str): The name of the course.
enrolled_students (Dict[str, Enrollment]): A dictionary mapping student IDs to `Enrollment` instances for students enrolled in the course.
instructors (Dict[str, Instructor]): A dictionary mapping instructor IDs to `Instructor` instances for those teaching the course, or None if no instructors are assigned.
Notes:
Attributes defaults to an empty dictionary using default_factory. This ensures that each instance of the class gets a new dictionary instead of sharing a single instance across all instances of the model.
"""
id: str = Field(
default=CourseNameId.INTRO_TO_PROGRAMMING.course_id, primary_key=True)
course_name: str = Field(
default=CourseNameId.INTRO_TO_PROGRAMMING.course_name)
enrollments: List[Enrollment] = Relationship(
back_populates="course", cascade_delete=True)
instructors: List[Instructor] = Relationship(back_populates="course")
def __str__(self) -> str:
"""
Returns a string representation of the course.
Returns:
str: A string describing the course, including the course name, course ID, and the number of enrolled students.
"""
return f"Course(course_name: {self.course_name}, id: {self.id}, enrolled_students: {self.enrollments}, total_students_enrolled: {len(self.enrollments)}, instructors: {self.instructors}, total_instructors: {len(self.instructors)})"
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