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kmels/gist:3908520

Created October 17, 2012 21:53
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gistfile1.txt
maybeGetBy :: forall (m :: * -> *) val. (PersistEntity val,
PersistUnique
(PersistEntityBackend val) m) =>
Unique val (PersistEntityBackend val)
-> MaybeT
(PersistEntityBackend val m) (Database.Persist.Store.Entity val)
maybeGetBy criterion = MaybeT $ getBy criterion
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