Database.PostgreSQL.Simple.Newtypes

Module with newtypes suitable to usage with DerivingVia or standalone.

The newtypes are named after packages they wrap.

Documentation

newtype Aeson a

A newtype wrapper with ToField and FromField instances based on ToJSON and FromJSON type classes from aeson.

Example using DerivingVia:

data Foo = Foo Int String
  deriving stock (Eq, Show, Generic)            -- GHC built int
  deriving anyclass (FromJSON, ToJSON)          -- Derived using GHC Generics
  deriving (ToField, FromField) via Aeson Foo   -- DerivingVia

Example using Aeson newtype directly, for more ad-hoc queries

execute conn "INSERT INTO tbl (fld) VALUES (?)" (Only (Aeson x))

Since: 0.6.3

Constructors

Aeson a

Instances

Functor Aeson

Defined in Database.PostgreSQL.Simple.Newtypes

Methods

fmap :: (a -> b) -> Aeson a -> Aeson b

(<$) :: a -> Aeson b -> Aeson a

Eq a => Eq (Aeson a)

Defined in Database.PostgreSQL.Simple.Newtypes

Methods

(==) :: Aeson a -> Aeson a -> Bool

(/=) :: Aeson a -> Aeson a -> Bool

Read a => Read (Aeson a)

Defined in Database.PostgreSQL.Simple.Newtypes

Methods

readsPrec :: Int -> ReadS (Aeson a)

readList :: ReadS [Aeson a]

readPrec :: ReadPrec (Aeson a)

readListPrec :: ReadPrec [Aeson a]

Show a => Show (Aeson a)

Defined in Database.PostgreSQL.Simple.Newtypes

Methods

showsPrec :: Int -> Aeson a -> ShowS

show :: Aeson a -> String

showList :: [Aeson a] -> ShowS

ToJSON a => ToField (Aeson a)

Defined in Database.PostgreSQL.Simple.Newtypes

Methods

toField :: Aeson a -> Action

(FromJSON a, Typeable a) => FromField (Aeson a)

Defined in Database.PostgreSQL.Simple.Newtypes

Methods

fromField :: FieldParser (Aeson a)

getAeson :: Aeson a -> a