9e6c44911d
This change allows graded assignments to be added to a campus LMS regardless of the granularity at which the problem sits. Previously a grade could only be returned if the usage ID for the problem itself was specified in the LTI launch. The code assumes that courses taking advantage of this functionality are arranged in a hiearchy (with sections being parents to verticals, and verticals being parents to problems). When a grading event occurs it traverses the parent hiearchy to identify any previous graded LTI launches for which the new scoring event should generate a grade update. It then calculates and sends scores to each of those outcome services. Since grade calculation is an expensive operation, the code optimizes the case where a problem has been added only once as a leaf unit. In that case it is able to behave as before, just taking the grade from the signal without having to calculate grades for the whole course.
LMS (Learning Management System) -------------------------------- This directory contains code relating to the student portal for edX.