src/Rel8/Query/Each.hs · rel8

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1{-# language FlexibleContexts #-}

3module Rel8.Query.Each

4 ( each

5 )

6where

8-- base

9import Prelude

11-- opaleye

12import qualified Opaleye.Table as Opaleye

14-- rel8

15import Rel8.Query ( Query )

16import Rel8.Query.Opaleye ( fromOpaleye )

17import Rel8.Schema.Table ( TableSchema )

18import Rel8.Table ( fromColumns, toColumns )

19import Rel8.Table.Opaleye ( table, unpackspec )

20import Rel8.Table.Recontextualize ( Selects )

23-- | Select each row from a table definition. This is equivalent to @FROM

24-- table@.

26-- >>> mapM_ print =<< select c (each projectSchema)

27-- Project {projectAuthorId = 1, projectName = "rel8"}

28-- Project {projectAuthorId = 2, projectName = "aeson"}

29-- Project {projectAuthorId = 2, projectName = "text"}

30each :: Selects names exprs => TableSchema names -> Query exprs

31each =

32 fmap fromColumns .

33 fromOpaleye .

34 Opaleye.selectTableExplicit unpackspec .

35 table .

36 fmap toColumns