b50c905865
Sets the Enrollment API free of the modulestore by replacing modulestore queries with calls to the CourseOverview model. Course deletion invalidates the corresponding CourseOverview. XCOM-462.
275 lines
9.2 KiB
Python
275 lines
9.2 KiB
Python
"""
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Data Aggregation Layer of the Enrollment API. Collects all enrollment specific data into a single
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source to be used throughout the API.
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"""
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import logging
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from django.contrib.auth.models import User
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from opaque_keys.edx.keys import CourseKey
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from enrollment.errors import (
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CourseNotFoundError, CourseEnrollmentClosedError, CourseEnrollmentFullError,
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CourseEnrollmentExistsError, UserNotFoundError, InvalidEnrollmentAttribute
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)
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from enrollment.serializers import CourseEnrollmentSerializer, CourseField
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from openedx.core.djangoapps.content.course_overviews.models import CourseOverview
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from student.models import (
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CourseEnrollment, NonExistentCourseError, EnrollmentClosedError,
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CourseFullError, AlreadyEnrolledError, CourseEnrollmentAttribute
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)
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log = logging.getLogger(__name__)
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def get_course_enrollments(user_id):
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"""Retrieve a list representing all aggregated data for a user's course enrollments.
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Construct a representation of all course enrollment data for a specific user.
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Args:
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user_id (str): The name of the user to retrieve course enrollment information for.
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Returns:
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A serializable list of dictionaries of all aggregated enrollment data for a user.
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"""
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qset = CourseEnrollment.objects.filter(
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user__username=user_id, is_active=True
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).order_by('created')
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return CourseEnrollmentSerializer(qset).data # pylint: disable=no-member
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def get_course_enrollment(username, course_id):
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"""Retrieve an object representing all aggregated data for a user's course enrollment.
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Get the course enrollment information for a specific user and course.
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Args:
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username (str): The name of the user to retrieve course enrollment information for.
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course_id (str): The course to retrieve course enrollment information for.
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Returns:
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A serializable dictionary representing the course enrollment.
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"""
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course_key = CourseKey.from_string(course_id)
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try:
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enrollment = CourseEnrollment.objects.get(
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user__username=username, course_id=course_key
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)
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return CourseEnrollmentSerializer(enrollment).data # pylint: disable=no-member
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except CourseEnrollment.DoesNotExist:
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return None
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def create_course_enrollment(username, course_id, mode, is_active):
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"""Create a new course enrollment for the given user.
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Creates a new course enrollment for the specified user username.
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Args:
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username (str): The name of the user to create a new course enrollment for.
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course_id (str): The course to create the course enrollment for.
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mode (str): (Optional) The mode for the new enrollment.
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is_active (boolean): (Optional) Determines if the enrollment is active.
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Returns:
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A serializable dictionary representing the new course enrollment.
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Raises:
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CourseNotFoundError
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CourseEnrollmentFullError
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EnrollmentClosedError
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CourseEnrollmentExistsError
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"""
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course_key = CourseKey.from_string(course_id)
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try:
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user = User.objects.get(username=username)
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except User.DoesNotExist:
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msg = u"Not user with username '{username}' found.".format(username=username)
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log.warn(msg)
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raise UserNotFoundError(msg)
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try:
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enrollment = CourseEnrollment.enroll(user, course_key, check_access=True)
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return _update_enrollment(enrollment, is_active=is_active, mode=mode)
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except NonExistentCourseError as err:
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raise CourseNotFoundError(err.message)
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except EnrollmentClosedError as err:
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raise CourseEnrollmentClosedError(err.message)
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except CourseFullError as err:
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raise CourseEnrollmentFullError(err.message)
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except AlreadyEnrolledError as err:
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enrollment = get_course_enrollment(username, course_id)
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raise CourseEnrollmentExistsError(err.message, enrollment)
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def update_course_enrollment(username, course_id, mode=None, is_active=None):
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"""Modify a course enrollment for a user.
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Allows updates to a specific course enrollment.
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Args:
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username (str): The name of the user to retrieve course enrollment information for.
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course_id (str): The course to retrieve course enrollment information for.
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mode (str): (Optional) If specified, modify the mode for this enrollment.
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is_active (boolean): (Optional) Determines if the enrollment is active.
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Returns:
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A serializable dictionary representing the modified course enrollment.
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"""
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course_key = CourseKey.from_string(course_id)
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try:
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user = User.objects.get(username=username)
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except User.DoesNotExist:
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msg = u"Not user with username '{username}' found.".format(username=username)
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log.warn(msg)
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raise UserNotFoundError(msg)
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try:
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enrollment = CourseEnrollment.objects.get(user=user, course_id=course_key)
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return _update_enrollment(enrollment, is_active=is_active, mode=mode)
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except CourseEnrollment.DoesNotExist:
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return None
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def add_or_update_enrollment_attr(user_id, course_id, attributes):
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"""Set enrollment attributes for the enrollment of given user in the
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course provided.
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Args:
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course_id (str): The Course to set enrollment attributes for.
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user_id (str): The User to set enrollment attributes for.
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attributes (list): Attributes to be set.
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Example:
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>>>add_or_update_enrollment_attr(
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"Bob",
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"course-v1-edX-DemoX-1T2015",
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[
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{
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"namespace": "credit",
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"name": "provider_id",
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"value": "hogwarts",
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},
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]
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)
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"""
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course_key = CourseKey.from_string(course_id)
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user = _get_user(user_id)
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enrollment = CourseEnrollment.get_enrollment(user, course_key)
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if not _invalid_attribute(attributes) and enrollment is not None:
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CourseEnrollmentAttribute.add_enrollment_attr(enrollment, attributes)
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def get_enrollment_attributes(user_id, course_id):
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"""Retrieve enrollment attributes for given user for provided course.
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Args:
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user_id: The User to get enrollment attributes for
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course_id (str): The Course to get enrollment attributes for.
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Example:
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>>>get_enrollment_attributes("Bob", "course-v1-edX-DemoX-1T2015")
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[
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{
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"namespace": "credit",
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"name": "provider_id",
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"value": "hogwarts",
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},
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]
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Returns: list
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"""
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course_key = CourseKey.from_string(course_id)
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user = _get_user(user_id)
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enrollment = CourseEnrollment.get_enrollment(user, course_key)
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return CourseEnrollmentAttribute.get_enrollment_attributes(enrollment)
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def _get_user(user_id):
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"""Retrieve user with provided user_id
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Args:
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user_id(str): username of the user for which object is to retrieve
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Returns: obj
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"""
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try:
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return User.objects.get(username=user_id)
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except User.DoesNotExist:
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msg = u"Not user with username '{username}' found.".format(username=user_id)
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log.warn(msg)
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raise UserNotFoundError(msg)
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def _update_enrollment(enrollment, is_active=None, mode=None):
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enrollment.update_enrollment(is_active=is_active, mode=mode)
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enrollment.save()
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return CourseEnrollmentSerializer(enrollment).data # pylint: disable=no-member
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def _invalid_attribute(attributes):
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"""Validate enrollment attribute
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Args:
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attributes(dict): dict of attribute
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Return:
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list of invalid attributes
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"""
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invalid_attributes = []
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for attribute in attributes:
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if "namespace" not in attribute:
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msg = u"'namespace' not in enrollment attribute"
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log.warn(msg)
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invalid_attributes.append("namespace")
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raise InvalidEnrollmentAttribute(msg)
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if "name" not in attribute:
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msg = u"'name' not in enrollment attribute"
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log.warn(msg)
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invalid_attributes.append("name")
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raise InvalidEnrollmentAttribute(msg)
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if "value" not in attribute:
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msg = u"'value' not in enrollment attribute"
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log.warn(msg)
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invalid_attributes.append("value")
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raise InvalidEnrollmentAttribute(msg)
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return invalid_attributes
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def get_course_enrollment_info(course_id, include_expired=False):
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"""Returns all course enrollment information for the given course.
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Based on the course id, return all related course information.
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Args:
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course_id (str): The course to retrieve enrollment information for.
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include_expired (bool): Boolean denoting whether expired course modes
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should be included in the returned JSON data.
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Returns:
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A serializable dictionary representing the course's enrollment information.
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Raises:
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CourseNotFoundError
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"""
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course_key = CourseKey.from_string(course_id)
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try:
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course = CourseOverview.get_from_id(course_key)
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except CourseOverview.DoesNotExist:
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msg = u"Requested enrollment information for unknown course {course}".format(course=course_id)
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log.warning(msg)
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raise CourseNotFoundError(msg)
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else:
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return CourseField().to_native(course, include_expired=include_expired)
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