- Actually enumerate columns when any are ignored to avoid loading unknown attributes
- Remove old ignored_columns so we don't unnecessary bloat queries when not ignoring
- Various minor fixes for places we do unusual AR things to ensure they work with explicit columns
- Tweak some migrations to clear column information so future migrations are happy
refs AE-747
Change-Id: I60b1c3eae73f4fa9f0b6b6ab4d2b00abd8f8395f
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/339971
Tested-by: Service Cloud Jenkins <svc.cloudjenkins@instructure.com>
Reviewed-by: Cody Cutrer <cody@instructure.com>
Migration-Review: Cody Cutrer <cody@instructure.com>
QA-Review: Jacob Burroughs <jburroughs@instructure.com>
Product-Review: Jacob Burroughs <jburroughs@instructure.com>