method
preload_one
v3.2.13 -
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Class: Preloader
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preload_one(association)
private
Not all records have the same class, so group then preload group on the reflection itself so that if various subclass share the same association then we do not split them unnecessarily
Additionally, polymorphic belongs_to associations can have multiple associated classes, depending on the polymorphic_type field. So we group by the classes as well.