Flowdock
method

preload_one

Importance_1
Ruby on Rails latest stable (v4.0.2) - 0 notes - Class: Preloader
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.

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