from django.db import models
from django.conf import settings


class UserCourse(models.Model):

    user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.DO_NOTHING)
    course = models.ForeignKey('university.Course', on_delete=models.DO_NOTHING)
    expires_at = models.DateTimeField()
    created_at = models.DateTimeField(auto_now_add=True)
    created_by = models.ForeignKey(
        settings.AUTH_USER_MODEL,
        on_delete=models.DO_NOTHING,
        related_name='staff_grant_user_course')

    class Meta:
        db_table = 'user_courses'
        unique_together = ('user', 'course')