[11.x] Don't touch BelongsTo relationship when it doesn't exist #52407
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Currently,
MorphTo
andBelongsToMany
check for relation existence before sending the update query to the database.This adds that check to the
BelongsTo
relationship.I found this when trawling through query logs. Nullable belongs to relationship were producing a lot of unnecessary update queries
Additionally,
getParentKey()
can be used to find the child foreign key value.