121 lines
3.9 KiB
Python
121 lines
3.9 KiB
Python
# -*- coding: utf-8 -*-
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"""
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Django model specifications for the Program Enrollments API
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"""
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from django.contrib.auth.models import User
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from django.core.exceptions import ValidationError
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from django.db import models
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from django.utils.translation import ugettext_lazy as _
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from model_utils.models import TimeStampedModel
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from opaque_keys.edx.django.models import CourseKeyField
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from simple_history.models import HistoricalRecords
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from student.models import CourseEnrollment
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from .constants import ProgramCourseEnrollmentStatuses, ProgramEnrollmentStatuses
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class ProgramEnrollment(TimeStampedModel): # pylint: disable=model-missing-unicode
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"""
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This is a model for Program Enrollments from the registrar service
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.. pii: PII is found in the external key for a program enrollment
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.. pii_types: other
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.. pii_retirement: local_api
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"""
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STATUS_CHOICES = ProgramEnrollmentStatuses.__MODEL_CHOICES__
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class Meta(object):
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app_label = "program_enrollments"
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# A student enrolled in a given (program, curriculum) should always
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# have a non-null ``user`` or ``external_user_key`` field (or both).
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unique_together = (
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('user', 'program_uuid', 'curriculum_uuid'),
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('external_user_key', 'program_uuid', 'curriculum_uuid'),
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)
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user = models.ForeignKey(
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User,
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null=True,
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blank=True, on_delete=models.CASCADE
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)
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external_user_key = models.CharField(
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db_index=True,
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max_length=255,
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null=True
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)
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program_uuid = models.UUIDField(db_index=True, null=False)
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curriculum_uuid = models.UUIDField(db_index=True, null=False)
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status = models.CharField(max_length=9, choices=STATUS_CHOICES)
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historical_records = HistoricalRecords()
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def clean(self):
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if not (self.user or self.external_user_key):
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raise ValidationError(_('One of user or external_user_key must not be null.'))
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@classmethod
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def retire_user(cls, user_id):
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"""
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With the parameter user_id, retire the external_user_key field
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Return True if there is data that was retired
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Return False if there is no matching data
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"""
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enrollments = cls.objects.filter(user=user_id)
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if not enrollments:
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return False
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for enrollment in enrollments:
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enrollment.historical_records.update(external_user_key=None)
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enrollments.update(external_user_key=None)
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return True
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def __str__(self):
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return '[ProgramEnrollment id={}]'.format(self.id)
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class ProgramCourseEnrollment(TimeStampedModel): # pylint: disable=model-missing-unicode
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"""
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This is a model to represent a learner's enrollment in a course
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in the context of a program from the registrar service
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.. no_pii:
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"""
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STATUS_CHOICES = ProgramCourseEnrollmentStatuses.__MODEL_CHOICES__
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class Meta(object):
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app_label = "program_enrollments"
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# For each program enrollment, there may be only one
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# waiting program-course enrollment per course key.
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# This same constraint is implicitly enforced for
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# completed program-course enrollments by the
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# OneToOneField on `course_enrollment`, which mandates that
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# there may be at most one program-course enrollment per
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# (user, course) pair.
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unique_together = (
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('program_enrollment', 'course_key'),
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)
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program_enrollment = models.ForeignKey(
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ProgramEnrollment,
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on_delete=models.CASCADE,
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related_name="program_course_enrollments"
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)
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course_enrollment = models.OneToOneField(
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CourseEnrollment,
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null=True,
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blank=True,
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)
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course_key = CourseKeyField(max_length=255)
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status = models.CharField(max_length=9, choices=STATUS_CHOICES)
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historical_records = HistoricalRecords()
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def __str__(self):
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return '[ProgramCourseEnrollment id={}]'.format(self.id)
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