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1. matchMaybe :: Default IfPP b b => MaybeFields a -> (Maybe a -> b) -> b

   opaleye	Opaleye.MaybeFields

   Use a Haskell \case expression to pattern match on a MaybeFields.

   example :: MaybeFields (Field SqlInt4) -> Field SqlInt4
   example mf = matchMaybe mf $ \case
   Nothing -> 0
   Just x  -> x * 100
   

2. nullableToMaybeFields :: FieldNullable a -> MaybeFields (Field a)

   opaleye	Opaleye.MaybeFields

   Convert NULL to nothingFields and non-NULL to a justFields

3. nullspecMaybeFields :: Nullspec a b -> Nullspec (MaybeFields a) (MaybeFields b)

   opaleye	Opaleye.MaybeFields

   No documentation available.

4. toFieldsMaybeFields :: Nullspec a b -> ToFields a b -> ToFields (Maybe a) (MaybeFields b)

   opaleye	Opaleye.MaybeFields

   No documentation available.

5. traverseMaybeFields :: (Default Unpackspec a a, Default Unpackspec b b) => SelectArr a b -> SelectArr (MaybeFields a) (MaybeFields b)

   opaleye	Opaleye.MaybeFields

   traverseMaybeFields is analogous to Haskell's traverse :: (a -> [b]) -> Maybe a -> [Maybe b]. In particular, traverse has the following definition that generalises to traverseMaybeFields:

   • traverse _ Nothing = pure Nothing

   • traverse f (Just x) = fmap Just (f x)

6. traverseMaybeFieldsExplicit :: Unpackspec a a -> Unpackspec b b -> SelectArr a b -> SelectArr (MaybeFields a) (MaybeFields b)

   opaleye	Opaleye.MaybeFields

   No documentation available.

7. unpackspecMaybeFields :: Unpackspec a b -> Unpackspec (MaybeFields a) (MaybeFields b)

   opaleye	Opaleye.MaybeFields

   No documentation available.

8. valuesspecMaybeFields :: Valuesspec a b -> Valuesspec (MaybeFields a) (MaybeFields b)

   opaleye	Opaleye.MaybeFields

   No documentation available.

9. checkMapMaybe :: HasCallStack => (a -> Maybe b) -> Parser a -> Parser b

   opt-env-conf	OptEnvConf

   Like checkMapEither but without a helpful error message. Prefer checkMapEither.

10. checkMapMaybe :: HasCallStack => (a -> Maybe b) -> Parser a -> Parser b

    opt-env-conf	OptEnvConf

    Like checkMapEither but without a helpful error message. Prefer checkMapEither.

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