def _generate_grades(course_key, enrollments):
"""
Load enrolled user grades for a program-course,
using bulk fetching for efficiency.
Arguments:
course_key (CourseKey)
enrollments (list[ProgramCourseEnrollment])
Yields: BaseProgramCourseGrade
"""
users = [enrollment.program_enrollment.user for enrollment in enrollments]
prefetch_course_grades(course_key, users)
try:
grades_iter = CourseGradeFactory().iter(users, course_key=course_key)
for enrollment, grade_tuple in zip(enrollments, grades_iter):
user, course_grade, exception = grade_tuple
if course_grade:
yield ProgramCourseGradeOk(enrollment, course_grade)
else:
error_template = 'Failed to load course grade for user ID {} in {}: {}'
error_string = error_template.format(
user.id, course_key,
text_type(exception) if exception else 'Unknown error')
logger.error(error_string)
yield ProgramCourseGradeError(enrollment, exception)
finally:
clear_prefetched_course_grades(course_key)
def bulk_course_grade_context(course_key, users):
"""
Prefetches grades for the given users in the given course
within a context, storing in a RequestCache and deleting
on context exit.
"""
prefetch_course_grades(course_key, users)
try:
yield
finally:
clear_prefetched_course_grades(course_key)
def bulk_course_grade_context(course_key, users):
"""
Prefetches grades for the given users in the given course
within a context, storing in a RequestCache and deleting
on context exit.
"""
prefetch_course_grades(course_key, users)
try:
yield
finally:
clear_prefetched_course_grades(course_key)