Jake Dallimore 1dee827c39 MDL-63973 core_badges: related badges query now works both ways
If A is related to B, then we should be able to view this relationship
from both badge A and badge B. The following badge methods were updated:
- get_related_badges()
- has_related()
- delete_related_badge()
2018-11-19 11:08:00 +08:00
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