{-# LANGUAGE OverloadedStrings, ExtendedDefaultRules #-} import Database.MongoDB import Control.Monad.Trans (liftIO) main :: IO () main = do pipe <- runIOE $ connect (host "127.0.0.1") e <- access pipe master "baseball" run close pipe print e run :: Action IO () run = do clearTeams insertTeams allTeams >>= printDocs "All Teams" nationalLeagueTeams >>= printDocs "National League Teams" newYorkTeams >>= printDocs "New York Teams" clearTeams :: Action IO () clearTeams = delete (select [] "team") insertTeams :: Action IO [Value] insertTeams = insertMany "team" [ ["name" =: "Yankees", "home" =: ["city" =: "New York", "state" =: "NY"], "league" =: "American"], ["name" =: "Mets", "home" =: ["city" =: "New York", "state" =: "NY"], "league" =: "National"], ["name" =: "Phillies", "home" =: ["city" =: "Philadelphia", "state" =: "PA"], "league" =: "National"], ["name" =: "Red Sox", "home" =: ["city" =: "Boston", "state" =: "MA"], "league" =: "American"] ] allTeams :: Action IO [Document] allTeams = rest =<< find (select [] "team") {sort = ["home.city" =: 1]} nationalLeagueTeams :: Action IO [Document] nationalLeagueTeams = rest =<< find (select ["league" =: "National"] "team") newYorkTeams :: Action IO [Document] newYorkTeams = rest =<< find (select ["home.state" =: "NY"] "team") {project = ["name" =: 1, "league" =: 1]} printDocs :: String -> [Document] -> Action IO () printDocs title docs = liftIO $ putStrLn title >> mapM_ (print . exclude ["_id"]) docs