{-# LANGUAGE ConstraintKinds , EmptyDataDecls , FlexibleContexts , GADTs , GeneralizedNewtypeDeriving , MultiParamTypeClasses , OverloadedStrings , QuasiQuotes , Rank2Types , TemplateHaskell , TypeFamilies , ScopedTypeVariables #-} module Main (main) where import Control.Applicative ((<$>)) import Control.Monad (replicateM_) import Control.Monad.IO.Class (MonadIO(liftIO)) import Control.Monad.Logger (MonadLogger(..), runStderrLoggingT, runNoLoggingT) import Control.Monad.Trans.Control (MonadBaseControl(..)) import Database.Esqueleto import Database.Persist.Sqlite (withSqliteConn) import Database.Persist.TH import Test.Hspec import qualified Data.Conduit as C -- Test schema share [mkPersist sqlSettings, mkMigrate "migrateAll"] [persistUpperCase| Person name String age Int Maybe deriving Eq Show BlogPost title String authorId PersonId deriving Eq Show Follow follower PersonId followed PersonId deriving Eq Show |] main :: IO () main = do let p1 = Person "John" (Just 36) p2 = Person "Rachel" Nothing p3 = Person "Mike" (Just 17) p4 = Person "Livia" (Just 17) hspec $ do describe "select" $ do it "works for a single value" $ run $ do ret <- select $ return $ val (3 :: Int) liftIO $ ret `shouldBe` [ Value 3 ] it "works for a pair of a single value and ()" $ run $ do ret <- select $ return (val (3 :: Int), ()) liftIO $ ret `shouldBe` [ (Value 3, ()) ] it "works for a single ()" $ run $ do ret <- select $ return () liftIO $ ret `shouldBe` [ () ] it "works for a single NULL value" $ run $ do ret <- select $ return $ nothing liftIO $ ret `shouldBe` [ Value (Nothing :: Maybe Int) ] describe "select/from" $ do it "works for a simple example" $ run $ do p1e <- insert' p1 ret <- select $ from $ \person -> return person liftIO $ ret `shouldBe` [ p1e ] it "works for a simple self-join (one entity)" $ run $ do p1e <- insert' p1 ret <- select $ from $ \(person1, person2) -> return (person1, person2) liftIO $ ret `shouldBe` [ (p1e, p1e) ] it "works for a simple self-join (two entities)" $ run $ do p1e <- insert' p1 p2e <- insert' p2 ret <- select $ from $ \(person1, person2) -> return (person1, person2) liftIO $ ret `shouldBe` [ (p1e, p1e) , (p1e, p2e) , (p2e, p1e) , (p2e, p2e) ] it "works for a simple projection" $ run $ do p1k <- insert p1 p2k <- insert p2 ret <- select $ from $ \p -> return (p ^. PersonId, p ^. PersonName) liftIO $ ret `shouldBe` [ (Value p1k, Value (personName p1)) , (Value p2k, Value (personName p2)) ] it "works for a simple projection with a simple implicit self-join" $ run $ do _ <- insert p1 _ <- insert p2 ret <- select $ from $ \(pa, pb) -> return (pa ^. PersonName, pb ^. PersonName) liftIO $ ret `shouldBe` [ (Value (personName p1), Value (personName p1)) , (Value (personName p1), Value (personName p2)) , (Value (personName p2), Value (personName p1)) , (Value (personName p2), Value (personName p2)) ] it "works with many kinds of LIMITs and OFFSETs" $ run $ do [p1e, p2e, p3e, p4e] <- mapM insert' [p1, p2, p3, p4] let people = from $ \p -> do orderBy [asc (p ^. PersonName)] return p ret1 <- select $ do p <- people limit 2 limit 1 return p liftIO $ ret1 `shouldBe` [ p1e ] ret2 <- select $ do p <- people limit 1 limit 2 return p liftIO $ ret2 `shouldBe` [ p1e, p4e ] ret3 <- select $ do p <- people offset 3 offset 2 return p liftIO $ ret3 `shouldBe` [ p3e, p2e ] ret4 <- select $ do p <- people offset 3 limit 5 offset 2 limit 3 offset 1 limit 2 return p liftIO $ ret4 `shouldBe` [ p4e, p3e ] ret5 <- select $ do p <- people offset 1000 limit 1 limit 1000 offset 0 return p liftIO $ ret5 `shouldBe` [ p1e, p4e, p3e, p2e ] describe "select/JOIN" $ do it "works with a LEFT OUTER JOIN" $ run $ do p1e <- insert' p1 p2e <- insert' p2 p3e <- insert' p3 p4e <- insert' p4 b12e <- insert' $ BlogPost "b" (entityKey p1e) b11e <- insert' $ BlogPost "a" (entityKey p1e) b31e <- insert' $ BlogPost "c" (entityKey p3e) ret <- select $ from $ \(p `LeftOuterJoin` mb) -> do on (just (p ^. PersonId) ==. mb ?. BlogPostAuthorId) orderBy [ asc (p ^. PersonName), asc (mb ?. BlogPostTitle) ] return (p, mb) liftIO $ ret `shouldBe` [ (p1e, Just b11e) , (p1e, Just b12e) , (p4e, Nothing) , (p3e, Just b31e) , (p2e, Nothing) ] it "typechecks (A LEFT OUTER JOIN (B LEFT OUTER JOIN C))" $ let _ = run $ select $ from $ \(a `LeftOuterJoin` (b `LeftOuterJoin` c)) -> let _ = [a, b, c] :: [ SqlExpr (Entity Person) ] in return a in return () :: IO () it "typechecks ((A LEFT OUTER JOIN B) LEFT OUTER JOIN C)" $ let _ = run $ select $ from $ \((a `LeftOuterJoin` b) `LeftOuterJoin` c) -> let _ = [a, b, c] :: [ SqlExpr (Entity Person) ] in return a in return () :: IO () it "throws an error for using on without joins" $ run (select $ from $ \(p, mb) -> do on (just (p ^. PersonId) ==. mb ?. BlogPostAuthorId) orderBy [ asc (p ^. PersonName), asc (mb ?. BlogPostTitle) ] return (p, mb) ) `shouldThrow` (\(OnClauseWithoutMatchingJoinException _) -> True) it "throws an error for using too many ons" $ run (select $ from $ \(p `FullOuterJoin` mb) -> do on (just (p ^. PersonId) ==. mb ?. BlogPostAuthorId) on (just (p ^. PersonId) ==. mb ?. BlogPostAuthorId) orderBy [ asc (p ^. PersonName), asc (mb ?. BlogPostTitle) ] return (p, mb) ) `shouldThrow` (\(OnClauseWithoutMatchingJoinException _) -> True) describe "select/where_" $ do it "works for a simple example with (==.)" $ run $ do p1e <- insert' p1 _ <- insert' p2 _ <- insert' p3 ret <- select $ from $ \p -> do where_ (p ^. PersonName ==. val "John") return p liftIO $ ret `shouldBe` [ p1e ] it "works for a simple example with (==.) and (||.)" $ run $ do p1e <- insert' p1 p2e <- insert' p2 _ <- insert' p3 ret <- select $ from $ \p -> do where_ (p ^. PersonName ==. val "John" ||. p ^. PersonName ==. val "Rachel") return p liftIO $ ret `shouldBe` [ p1e, p2e ] it "works for a simple example with (>.) [uses val . Just]" $ run $ do p1e <- insert' p1 _ <- insert' p2 _ <- insert' p3 ret <- select $ from $ \p -> do where_ (p ^. PersonAge >. val (Just 17)) return p liftIO $ ret `shouldBe` [ p1e ] it "works for a simple example with (>.) and not_ [uses just . val]" $ run $ do _ <- insert' p1 _ <- insert' p2 p3e <- insert' p3 ret <- select $ from $ \p -> do where_ (not_ $ p ^. PersonAge >. just (val 17)) return p liftIO $ ret `shouldBe` [ p3e ] it "works with isNothing" $ run $ do _ <- insert' p1 p2e <- insert' p2 _ <- insert' p3 ret <- select $ from $ \p -> do where_ $ isNothing (p ^. PersonAge) return p liftIO $ ret `shouldBe` [ p2e ] it "works with not_ . isNothing" $ run $ do p1e <- insert' p1 _ <- insert' p2 ret <- select $ from $ \p -> do where_ $ not_ (isNothing (p ^. PersonAge)) return p liftIO $ ret `shouldBe` [ p1e ] it "works for a many-to-many implicit join" $ run $ do p1e@(Entity p1k _) <- insert' p1 p2e@(Entity p2k _) <- insert' p2 _ <- insert' p3 p4e@(Entity p4k _) <- insert' p4 f12 <- insert' (Follow p1k p2k) f21 <- insert' (Follow p2k p1k) f42 <- insert' (Follow p4k p2k) f11 <- insert' (Follow p1k p1k) ret <- select $ from $ \(follower, follows, followed) -> do where_ $ follower ^. PersonId ==. follows ^. FollowFollower &&. followed ^. PersonId ==. follows ^. FollowFollowed orderBy [ asc (follower ^. PersonName) , asc (followed ^. PersonName) ] return (follower, follows, followed) liftIO $ ret `shouldBe` [ (p1e, f11, p1e) , (p1e, f12, p2e) , (p4e, f42, p2e) , (p2e, f21, p1e) ] it "works for a many-to-many explicit join" $ run $ do p1e@(Entity p1k _) <- insert' p1 p2e@(Entity p2k _) <- insert' p2 _ <- insert' p3 p4e@(Entity p4k _) <- insert' p4 f12 <- insert' (Follow p1k p2k) f21 <- insert' (Follow p2k p1k) f42 <- insert' (Follow p4k p2k) f11 <- insert' (Follow p1k p1k) ret <- select $ from $ \(follower `InnerJoin` follows `InnerJoin` followed) -> do on $ followed ^. PersonId ==. follows ^. FollowFollowed on $ follower ^. PersonId ==. follows ^. FollowFollower orderBy [ asc (follower ^. PersonName) , asc (followed ^. PersonName) ] return (follower, follows, followed) liftIO $ ret `shouldBe` [ (p1e, f11, p1e) , (p1e, f12, p2e) , (p4e, f42, p2e) , (p2e, f21, p1e) ] it "works for a many-to-many explicit join with LEFT OUTER JOINs" $ run $ do p1e@(Entity p1k _) <- insert' p1 p2e@(Entity p2k _) <- insert' p2 p3e <- insert' p3 p4e@(Entity p4k _) <- insert' p4 f12 <- insert' (Follow p1k p2k) f21 <- insert' (Follow p2k p1k) f42 <- insert' (Follow p4k p2k) f11 <- insert' (Follow p1k p1k) ret <- select $ from $ \(follower `LeftOuterJoin` mfollows `LeftOuterJoin` mfollowed) -> do on $ mfollowed ?. PersonId ==. mfollows ?. FollowFollowed on $ just (follower ^. PersonId) ==. mfollows ?. FollowFollower orderBy [ asc ( follower ^. PersonName) , asc (mfollowed ?. PersonName) ] return (follower, mfollows, mfollowed) liftIO $ ret `shouldBe` [ (p1e, Just f11, Just p1e) , (p1e, Just f12, Just p2e) , (p4e, Just f42, Just p2e) , (p3e, Nothing, Nothing) , (p2e, Just f21, Just p1e) ] describe "select/orderBy" $ do it "works with a single ASC field" $ run $ do p1e <- insert' p1 p2e <- insert' p2 p3e <- insert' p3 ret <- select $ from $ \p -> do orderBy [asc $ p ^. PersonName] return p liftIO $ ret `shouldBe` [ p1e, p3e, p2e ] it "works with two ASC fields" $ run $ do p1e <- insert' p1 p2e <- insert' p2 p3e <- insert' p3 p4e <- insert' p4 ret <- select $ from $ \p -> do orderBy [asc (p ^. PersonAge), asc (p ^. PersonName)] return p liftIO $ ret `shouldBe` [ p2e, p4e, p3e, p1e ] it "works with one ASC and one DESC field" $ run $ do p1e <- insert' p1 p2e <- insert' p2 p3e <- insert' p3 p4e <- insert' p4 ret <- select $ from $ \p -> do orderBy [desc (p ^. PersonAge), asc (p ^. PersonName)] return p liftIO $ ret `shouldBe` [ p1e, p4e, p3e, p2e ] it "works with a sub_select" $ run $ do [p1k, p2k, p3k, p4k] <- mapM insert [p1, p2, p3, p4] [b1k, b2k, b3k, b4k] <- mapM (insert . BlogPost "") [p1k, p2k, p3k, p4k] ret <- select $ from $ \b -> do orderBy [desc $ sub_select $ from $ \p -> do where_ (p ^. PersonId ==. b ^. BlogPostAuthorId) return (p ^. PersonName) ] return (b ^. BlogPostId) liftIO $ ret `shouldBe` (Value <$> [b2k, b3k, b4k, b1k]) describe "selectDistinct" $ it "works on a simple example" $ run $ do p1k <- insert p1 let (t1, t2, t3) = ("a", "b", "c") mapM_ (insert . flip BlogPost p1k) [t1, t3, t2, t2, t1] ret <- selectDistinct $ from $ \b -> do let title = b ^. BlogPostTitle orderBy [asc title] return title liftIO $ ret `shouldBe` [ Value t1, Value t2, Value t3 ] describe "text functions" $ it "like, (%) and (++.) work on a simple example" $ run $ do [p1e, p2e, p3e, p4e] <- mapM insert' [p1, p2, p3, p4] let nameContains t expected = do ret <- select $ from $ \p -> do where_ (p ^. PersonName `like` (%) ++. val t ++. (%)) orderBy [asc (p ^. PersonName)] return p liftIO $ ret `shouldBe` expected nameContains "h" [p1e, p2e] nameContains "i" [p4e, p3e] nameContains "iv" [p4e] describe "delete" $ it "works on a simple example" $ run $ do p1e <- insert' p1 p2e <- insert' p2 p3e <- insert' p3 let getAll = select $ from $ \p -> do orderBy [asc (p ^. PersonName)] return p ret1 <- getAll liftIO $ ret1 `shouldBe` [ p1e, p3e, p2e ] () <- delete $ from $ \p -> where_ (p ^. PersonName ==. val (personName p1)) ret2 <- getAll liftIO $ ret2 `shouldBe` [ p3e, p2e ] n <- deleteCount $ from $ \p -> return ((p :: SqlExpr (Entity Person)) `seq` ()) ret3 <- getAll liftIO $ (n, ret3) `shouldBe` (2, []) describe "update" $ do it "works on a simple example" $ run $ do p1k <- insert p1 p2k <- insert p2 p3k <- insert p3 let anon = "Anonymous" () <- update $ \p -> do set p [ PersonName =. val anon , PersonAge *=. just (val 2) ] where_ (p ^. PersonName !=. val "Mike") n <- updateCount $ \p -> do set p [ PersonAge +=. just (val 1) ] where_ (p ^. PersonName !=. val "Mike") ret <- select $ from $ \p -> do orderBy [ asc (p ^. PersonName), asc (p ^. PersonAge) ] return p liftIO $ n `shouldBe` 2 liftIO $ ret `shouldBe` [ Entity p2k (Person anon Nothing) , Entity p1k (Person anon (Just 73)) , Entity p3k p3 ] it "works with a subexpression having COUNT(*)" $ run $ do p1k <- insert p1 p2k <- insert p2 p3k <- insert p3 replicateM_ 3 (insert $ BlogPost "" p1k) replicateM_ 7 (insert $ BlogPost "" p3k) let blogPostsBy p = from $ \b -> do where_ (b ^. BlogPostAuthorId ==. p ^. PersonId) return countRows () <- update $ \p -> do set p [ PersonAge =. just (sub_select (blogPostsBy p)) ] ret <- select $ from $ \p -> do orderBy [ asc (p ^. PersonName) ] return p liftIO $ ret `shouldBe` [ Entity p1k p1 { personAge = Just 3 } , Entity p3k p3 { personAge = Just 7 } , Entity p2k p2 { personAge = Just 0 } ] it "GROUP BY works with COUNT" $ run $ do p1k <- insert p1 p2k <- insert p2 p3k <- insert p3 replicateM_ 3 (insert $ BlogPost "" p1k) replicateM_ 7 (insert $ BlogPost "" p3k) ret <- select $ from $ \(p `LeftOuterJoin` b) -> do on (p ^. PersonId ==. b ^. BlogPostAuthorId) groupBy (p ^. PersonId) let cnt = count (b ^. BlogPostId) orderBy [ asc cnt ] return (p, cnt) liftIO $ ret `shouldBe` [ (Entity p2k p2, Value (0 :: Int)) , (Entity p1k p1, Value 3) , (Entity p3k p3, Value 7) ] it "GROUP BY works with HAVING" $ run $ do p1k <- insert p1 p2k <- insert p2 p3k <- insert p3 replicateM_ 3 (insert $ BlogPost "" p1k) replicateM_ 7 (insert $ BlogPost "" p3k) ret <- select $ from $ \(p `LeftOuterJoin` b) -> do on (p ^. PersonId ==. b ^. BlogPostAuthorId) let cnt = count (b ^. BlogPostId) groupBy (p ^. PersonId) having (cnt >. (val 0)) orderBy [ asc cnt ] return (p, cnt) liftIO $ ret `shouldBe` [ (Entity p1k p1, Value (3 :: Int)) , (Entity p3k p3, Value 7) ] describe "lists of values" $ do it "IN works for valList" $ run $ do p1k <- insert p1 p2k <- insert p2 p3k <- insert p3 ret <- select $ from $ \p -> do where_ (p ^. PersonName `in_` valList (personName <$> [p1, p2])) return p liftIO $ ret `shouldBe` [ Entity p1k p1 , Entity p2k p2 ] it "IN works for valList (null list)" $ run $ do p1k <- insert p1 p2k <- insert p2 p3k <- insert p3 ret <- select $ from $ \p -> do where_ (p ^. PersonName `in_` valList []) return p liftIO $ ret `shouldBe` [] it "IN works for subList_select" $ run $ do p1k <- insert p1 p2k <- insert p2 p3k <- insert p3 _ <- insert (BlogPost "" p1k) _ <- insert (BlogPost "" p3k) ret <- select $ from $ \p -> do let subquery = from $ \bp -> return (bp ^. BlogPostAuthorId) where_ (p ^. PersonId `in_` subList_select subquery) return p liftIO $ ret `shouldBe` [ Entity p1k p1 , Entity p3k p3 ] it "NOT IN works for subList_select" $ run $ do p1k <- insert p1 p2k <- insert p2 p3k <- insert p3 _ <- insert (BlogPost "" p1k) _ <- insert (BlogPost "" p3k) ret <- select $ from $ \p -> do let subquery = from $ \bp -> return (bp ^. BlogPostAuthorId) where_ (p ^. PersonId `notIn` subList_select subquery) return p liftIO $ ret `shouldBe` [ Entity p2k p2 ] it "EXISTS works for subList_select" $ run $ do p1k <- insert p1 p2k <- insert p2 p3k <- insert p3 _ <- insert (BlogPost "" p1k) _ <- insert (BlogPost "" p3k) ret <- select $ from $ \p -> do where_ $ exists $ from $ \bp -> do where_ (bp ^. BlogPostAuthorId ==. p ^. PersonId) return p liftIO $ ret `shouldBe` [ Entity p1k p1 , Entity p3k p3 ] it "EXISTS works for subList_select" $ run $ do p1k <- insert p1 p2k <- insert p2 p3k <- insert p3 _ <- insert (BlogPost "" p1k) _ <- insert (BlogPost "" p3k) ret <- select $ from $ \p -> do where_ $ notExists $ from $ \bp -> do where_ (bp ^. BlogPostAuthorId ==. p ^. PersonId) return p liftIO $ ret `shouldBe` [ Entity p2k p2 ] describe "inserts by select" $ do it "IN works for insertSelect" $ run $ do _ <- insert p1 _ <- insert p2 _ <- insert p3 insertSelect $ from $ \p -> do return $ BlogPost <# val "FakePost" <&> (p ^. PersonId) ret <- select $ from (\(b::(SqlExpr (Entity BlogPost))) -> return countRows) liftIO $ ret `shouldBe` [Value (3::Int)] ---------------------------------------------------------------------- insert' :: ( Functor m , PersistStore m , PersistMonadBackend m ~ PersistEntityBackend val , PersistEntity val ) => val -> m (Entity val) insert' v = flip Entity v <$> insert v type RunDbMonad m = ( MonadBaseControl IO m, MonadIO m, MonadLogger m , C.MonadUnsafeIO m, C.MonadThrow m ) run, runSilent, runVerbose :: (forall m. RunDbMonad m => SqlPersistT (C.ResourceT m) a) -> IO a runSilent act = runNoLoggingT $ run_worker act runVerbose act = runStderrLoggingT $ run_worker act run = if verbose then runVerbose else runSilent verbose :: Bool verbose = True run_worker :: RunDbMonad m => SqlPersistT (C.ResourceT m) a -> m a run_worker = C.runResourceT . withSqliteConn ":memory:" . runSqlConn . (runMigrationSilent migrateAll >>)