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added doctest

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iko 2019-10-19 00:53:17 +03:00
parent 9012d25a5f
commit 44e68f87c7
1 changed files with 5 additions and 2 deletions
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7
squeal-postgresql/src/Squeal/PostgreSQL/Definition.hs
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@ -97,8 +97,11 @@ instance PGTyped schemas ('NotNull ty) => PGNullityTyped schemas ('NotNull ty) w
pgNullityType = notNullable (pgtype @_ @('NotNull ty))
-- | Allow you to specify pg column types in relation to haskell types.
-- | >>> hask @(Maybe String) ~ nullable text
-- | >>> hask @String ~ notNullable text
-- >>> printSQL $ hask @(Maybe String)
-- text NULL
--
-- >>> printSQL $ hask @Double
-- float8 NOT NULL
hask
:: forall h schemas. PGNullityTyped schemas (NullPG h)
=> ColumnTypeExpression schemas ('NoDef :=> NullPG h)