esqueleto-3.5.10.3: Type-safe EDSL for SQL queries on persistent backends.
Safe HaskellSafe-Inferred
LanguageHaskell2010

Database.Esqueleto.Experimental.ToMaybe

Documentation

type family Nullable a where ... Source #

Equations

Nullable (Maybe a) = a 
Nullable a = a 

class ToMaybe a where Source #

Associated Types

type ToMaybeT a Source #

Methods

toMaybe :: a -> ToMaybeT a Source #

Instances

Instances details
ToMaybe (SqlExpr (Value a)) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToMaybe

Associated Types

type ToMaybeT (SqlExpr (Value a)) Source #

ToMaybe (SqlExpr (Entity a)) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToMaybe

Associated Types

type ToMaybeT (SqlExpr (Entity a)) Source #

ToMaybe (SqlExpr (Maybe a)) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToMaybe

Associated Types

type ToMaybeT (SqlExpr (Maybe a)) Source #

(ToMaybe a, ToMaybe b) => ToMaybe (a :& b) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.From.Join

Associated Types

type ToMaybeT (a :& b) Source #

Methods

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

(ToMaybe a, ToMaybe b) => ToMaybe (a, b) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToMaybe

Associated Types

type ToMaybeT (a, b) Source #

Methods

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

(ToMaybe a, ToMaybe b, ToMaybe c) => ToMaybe (a, b, c) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToMaybe

Associated Types

type ToMaybeT (a, b, c) Source #

Methods

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

(ToMaybe a, ToMaybe b, ToMaybe c, ToMaybe d) => ToMaybe (a, b, c, d) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToMaybe

Associated Types

type ToMaybeT (a, b, c, d) Source #

Methods

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

(ToMaybe a, ToMaybe b, ToMaybe c, ToMaybe d, ToMaybe e) => ToMaybe (a, b, c, d, e) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToMaybe

Associated Types

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

Methods

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

(ToMaybe a, ToMaybe b, ToMaybe c, ToMaybe d, ToMaybe e, ToMaybe f) => ToMaybe (a, b, c, d, e, f) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToMaybe

Associated Types

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

Methods

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

(ToMaybe a, ToMaybe b, ToMaybe c, ToMaybe d, ToMaybe e, ToMaybe f, ToMaybe g) => ToMaybe (a, b, c, d, e, f, g) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToMaybe

Associated Types

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

Methods

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

(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) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToMaybe

Associated Types

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

Methods

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