Database.Persist.Join

Typeclass

class RunJoin a where

Associated Types

type Result a

Methods

runJoin :: PersistBackend m => a -> m (Result a)

Instances

(PersistEntity one, PersistEntity many, Ord (Key one)) => RunJoin (SelectOneMany one many)

One-to-many relation

data SelectOneMany one many

Constructors

SelectOneMany

Fields

somFilterOne :: [Filter one]

somOrderOne :: [Order one]

somFilterMany :: [Filter many]

somOrderMany :: [Order many]

somFilterKeys :: [Key one] -> Filter many

somGetKey :: many -> Key one

somIncludeNoMatch :: Bool

Instances

(PersistEntity one, PersistEntity many, Ord (Key one)) => RunJoin (SelectOneMany one many)

(PersistEntity one, PersistEntity many, Eq (Key one)) => RunJoin (SelectOneMany one many)

selectOneMany :: ([Key one] -> Filter many) -> (many -> Key one) -> SelectOneMany one many