Hierarchical relationships example swaps columns #3325
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I was having issues when testing the hierarchical relationship in a Phoenix app I was building. It turns out doing `Repo.preload(parent, :parent)` would have the parent load the child, and having `Repo.preload(child, :parent)` would load `nil`. (Where `parent` has `parent_id` set to `nil` and `child` has `parent_id` set to `parent`'s id.) Swapping the columns like I did here makes things function correctly.
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I was having issues when testing the hierarchical relationship in a Phoenix app I was building.
It turns out doing
Repo.preload(parent, :parent)would have the parent load the child, and havingRepo.preload(child, :parent)would loadnil. (Whereparenthasparent_idset tonilandchildhasparent_idset toparent's id.)Swapping the columns like I did here makes things function correctly.