Database.PostgreSQL.Query.TH.Enum

Helps to map enum types to postgresql enums.

Documentation

derivePgEnum

Arguments

:: InflectorFunc

mapping function from haskell constructor name to PG enum label

-> Name

type to derive instances for

-> DecsQ

derives FromField and ToField instances for a sum-type enum like

data Entity = Red | Green | Blue

type InflectorFunc = String -> String

Function to transform constructor name into its PG enum conterpart.