Database.PostgreSQL.Simple.Newtypes · postgresql-simple-0.7.0.0

newtypenewtype 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))

Constructors

Aeson a

Instances6Functor, Eq, Read, Show, FromField, ToField

Functor AesonDefined in postgresql-simple-0.7.0.0 · Database.PostgreSQL.Simple.Newtypes
Eq a => Eq (Aeson a)Defined in postgresql-simple-0.7.0.0 · Database.PostgreSQL.Simple.Newtypes
Read a => Read (Aeson a)Defined in postgresql-simple-0.7.0.0 · Database.PostgreSQL.Simple.Newtypes
Show a => Show (Aeson a)Defined in postgresql-simple-0.7.0.0 · Database.PostgreSQL.Simple.Newtypes
(FromJSON a, Typeable a) => FromField (Aeson a)Defined in postgresql-simple-0.7.0.0 · Database.PostgreSQL.Simple.Newtypes
ToJSON a => ToField (Aeson a)Defined in postgresql-simple-0.7.0.0 · Database.PostgreSQL.Simple.Newtypes