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from django.contrib.auth.models import User
from django.db import models
from jsonfield import JSONField

NOTIFICATION_CONFIG_VERSION = 1

NOTIFICATION_CHANNEL_CONFIG = {
      "web": False,
      "push": False,
      "email": False,
}

COURSE_NOTIFICATION_CONFIG = {
  "discussion": {
    "new_post": NOTIFICATION_CHANNEL_CONFIG
  },
}

class CourseNotificationPreferences(models.Model):
    """
    A model to store user notification preferences.
    """
    user = models.ForeignKey(  # example: User1
        User,
        related_name="notification_preferences",
        on_delete=models.CASCADE,
        db_index=True,
        help_text="User whose notification preferences are being stored.",
    )
    course = models.CharField(    # example: "course-v1:edX+DemoX+Demo_Course"
        max_length=255,
        blank=True,
        default=None,
        null=False,
        help_text="Course whose notification preferences are being stored.",
    )
    notification_config = JSONField(default=COURSE_NOTIFICATION_CONFIG)
    preferences_version = models.BooleanField(default=1)