Database.Esqueleto.Experimental.ToMaybe

Documentation

type family Nullable a where ...

Equations

Nullable (Maybe a) = a

Nullable a = a

class ToMaybe a where

Associated Types

type ToMaybeT a

Methods

toMaybe :: a -> ToMaybeT a

Instances

ToMaybe (SqlExpr (Value a))

Defined in Database.Esqueleto.Experimental.ToMaybe

Associated Types

type ToMaybeT (SqlExpr (Value a))

Methods

toMaybe :: SqlExpr (Value a) -> ToMaybeT (SqlExpr (Value a))

ToMaybe (SqlExpr (Entity a))

Defined in Database.Esqueleto.Experimental.ToMaybe

Associated Types

type ToMaybeT (SqlExpr (Entity a))

Methods

toMaybe :: SqlExpr (Entity a) -> ToMaybeT (SqlExpr (Entity a))

ToMaybe (SqlExpr (Maybe a))

Defined in Database.Esqueleto.Experimental.ToMaybe

Associated Types

type ToMaybeT (SqlExpr (Maybe a))

Methods

toMaybe :: SqlExpr (Maybe a) -> ToMaybeT (SqlExpr (Maybe a))

(ToMaybe a, ToMaybe b) => ToMaybe (a :& b)

Defined in Database.Esqueleto.Experimental.From.Join

Associated Types

type ToMaybeT (a :& b)

Methods

toMaybe :: (a :& b) -> ToMaybeT (a :& b)

(ToMaybe a, ToMaybe b) => ToMaybe (a, b)

Defined in Database.Esqueleto.Experimental.ToMaybe

Associated Types

type ToMaybeT (a, b)

Methods

toMaybe :: (a, b) -> ToMaybeT (a, b)

(ToMaybe a, ToMaybe b, ToMaybe c) => ToMaybe (a, b, c)

Defined in Database.Esqueleto.Experimental.ToMaybe

Associated Types

type ToMaybeT (a, b, c)

Methods

toMaybe :: (a, b, c) -> ToMaybeT (a, b, c)

(ToMaybe a, ToMaybe b, ToMaybe c, ToMaybe d) => ToMaybe (a, b, c, d)

Defined in Database.Esqueleto.Experimental.ToMaybe

Associated Types

type ToMaybeT (a, b, c, d)

Methods

toMaybe :: (a, b, c, d) -> ToMaybeT (a, b, c, d)

(ToMaybe a, ToMaybe b, ToMaybe c, ToMaybe d, ToMaybe e) => ToMaybe (a, b, c, d, e)

Defined in Database.Esqueleto.Experimental.ToMaybe

Associated Types

type ToMaybeT (a, b, c, d, e)

Methods

toMaybe :: (a, b, c, d, e) -> ToMaybeT (a, b, c, d, e)

(ToMaybe a, ToMaybe b, ToMaybe c, ToMaybe d, ToMaybe e, ToMaybe f) => ToMaybe (a, b, c, d, e, f)

Defined in Database.Esqueleto.Experimental.ToMaybe

Associated Types

type ToMaybeT (a, b, c, d, e, f)

Methods

toMaybe :: (a, b, c, d, e, f) -> ToMaybeT (a, b, c, d, e, f)

(ToMaybe a, ToMaybe b, ToMaybe c, ToMaybe d, ToMaybe e, ToMaybe f, ToMaybe g) => ToMaybe (a, b, c, d, e, f, g)

Defined in Database.Esqueleto.Experimental.ToMaybe

Associated Types

type ToMaybeT (a, b, c, d, e, f, g)

Methods

toMaybe :: (a, b, c, d, e, f, g) -> ToMaybeT (a, b, c, d, e, f, g)

(ToMaybe a, ToMaybe b, ToMaybe c, ToMaybe d, ToMaybe e, ToMaybe f, ToMaybe g, ToMaybe h) => ToMaybe (a, b, c, d, e, f, g, h)

Defined in Database.Esqueleto.Experimental.ToMaybe

Associated Types

type ToMaybeT (a, b, c, d, e, f, g, h)

Methods

toMaybe :: (a, b, c, d, e, f, g, h) -> ToMaybeT (a, b, c, d, e, f, g, h)