OCW resource readable_id needs to include more than course number #132
Description
Expected Behavior
Each run of an OCW course should be imported during the ETL pipeline as a distinct LearningResource. For example, "Chinese IV" (21G.104) from 2004, 2006, and 2018 should be stored as 3 separate LearningResource objects
Current Behavior
Only one OCW LearningResource with course id 21G.104 is imported during the ETL pipeline, with 3 runs. This is because readable_id is unique per platform and resource type.
unique_together = (("platform", "readable_id", "resource_type"),)
Possible Solution
Change readable_id for OCW courses to be <course_id>+<semester>_<year> and add the course_id to the associated Course.extra_course_numbers field.