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add index for modified to course and subsection grades

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Sanford Student
2017-01-11 14:39:10 -05:00
parent 28e3b1cb5a
commit 85fb7b8ad2
1 changed files with 11 additions and 0 deletions
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11
lms/djangoapps/grades/models.py
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@@ -253,6 +253,14 @@ class PersistentSubsectionGrade(DeleteGradesMixin, TimeStampedModel):
# * Course staff can see all grades for a course using (course_id,)
('course_id', 'user_id', 'usage_key'),
]
# Allows querying in the following ways:
# (modified): find all the grades updated within a certain timespan
# (modified, course_id): find all the grades updated within a timespan for a certain course
# (modified, course_id, usage_key): find all the grades updated within a timespan for a subsection
# in a course
index_together = [
('modified', 'course_id', 'usage_key')
]
# primary key will need to be large for this table
id = UnsignedBigIntAutoField(primary_key=True) # pylint: disable=invalid-name
@@ -502,11 +510,14 @@ class PersistentCourseGrade(DeleteGradesMixin, TimeStampedModel):
# (course_id) for instructors to see all course grades, implicitly created via the unique_together constraint
# (user_id) for course dashboard; explicitly declared as an index below
# (passed_timestamp, course_id) for tracking when users first earned a passing grade.
# (modified): find all the grades updated within a certain timespan
# (modified, course_id): find all the grades updated within a certain timespan for a course
unique_together = [
('course_id', 'user_id'),
]
index_together = [
('passed_timestamp', 'course_id'),
('modified', 'course_id')
]
# primary key will need to be large for this table