The first permanent example from the book of Yesod will not compile - cannot find perseverance

Question

I am trying to run Persistent examples in Yesod (chapter 10). I injected the original example into a .hs file, created a cache file and tried to compile. The compiler complains that it cannot find "persist". I assume that the persist function has moved to a new package (which I did not include) or was deprecated, but I do not know which ones and hoogle do not shed light on this problem. Any help is appreciated. Perhaps I should return to the version of Yesod on which the book is based. What Yesod platform should I install for this? Thanks Tim

Here is the error message:

perry$ cabal install Resolving dependencies... Configuring chapter10-0.1.0.0... Building chapter10-0.1.0.0... Preprocessing executable 'chapter10' for chapter10-0.1.0.0... [1 of 1] Compiling Main ( ex1.hs, dist/build/chapter10/chapter10-tmp/Main.o ) ex1.hs:8:55: Not in scope: `persist' cabal: Error: some packages failed to install: chapter10-0.1.0.0 failed during the building phase. The exception was: ExitFailure 1 

Here is my chapter10.cabal file:

 -- Initial chapter10.cabal generated by cabal init. For further -- documentation, see http://haskell.org/cabal/users-guide/ name: chapter10 version: 0.1.0.0 license-file: LICENSE cabal-version: >=1.8 build-type: Simple executable chapter10 main-is: ex1.hs -- other-modules: build-depends: base ==4.5.* , yesod-platform , yesod , persistent-sqlite , transformers , persistent-template , persistent 

Here is my ex1.hs file:

 {-# LANGUAGE QuasiQuotes, TemplateHaskell, TypeFamilies, OverloadedStrings #-} {-# LANGUAGE GADTs, FlexibleContexts #-} import Database.Persist import Database.Persist.Sqlite import Database.Persist.TH import Control.Monad.IO.Class (liftIO) share [mkPersist sqlSettings, mkMigrate "migrateAll"] [persist| Person name String age Int Maybe deriving Show BlogPost title String authorId PersonId deriving Show |] main :: IO () main = withSqliteConn ":memory:" $ runSqlConn $ do runMigration migrateAll johnId <- insert $ Person "John Doe" $ Just 35 janeId <- insert $ Person "Jane Doe" Nothing insert $ BlogPost "My fr1st p0st" johnId insert $ BlogPost "One more for good measure" johnId oneJohnPost <- selectList [BlogPostAuthorId ==. johnId] [LimitTo 1] liftIO $ print (oneJohnPost :: [Entity BlogPost]) john <- get johnId liftIO $ print (john :: Maybe Person) delete janeId deleteWhere [BlogPostAuthorId ==. johnId] 

Here are the versions of my dots and permanent packages:

 perry$ ghc-pkg list| grep -i -e yesod -e persist persistent-1.2.0.1 persistent-sqlite-1.2.0 persistent-template-1.2.0.1 yesod-1.2.1 yesod-auth-1.2.0.1 yesod-core-1.2.2 yesod-form-1.3.0 yesod-persistent-1.2.1 yesod-platform-1.2.1 yesod-routes-1.2.0.1 yesod-static-1.2.0 yesod-test-1.2.0 

Answer 1

According to some outdated documentation , persist deprecated. Apparently, it was removed in version 1.2.0.

persist :: QuasiQuoter

Deprecated: use persistUpperCase instead.