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/post.scala
Created Aug 3, 2017

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val categoriesFetcher: Fetcher[ShopRepository, Category, (Seq[CategoryId], Category), CategoryId] = Fetcher.relCaching(
(repo: ShopRepository, ids: Seq[CategoryId]) => repo.categories(ids),
(repo: ShopRepository, ids: RelationIds[Category]) => repo.categoriesByProducts(ids(categoriesForProductRelation))
)
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