Mock Migration

mockMigrationTest.hs

{-# LANGUAGE EmptyDataDecls             #-}
{-# LANGUAGE FlexibleContexts           #-}
{-# LANGUAGE GADTs                      #-}
{-# LANGUAGE GeneralizedNewtypeDeriving #-}
{-# LANGUAGE MultiParamTypeClasses      #-}
{-# LANGUAGE OverloadedStrings          #-}
{-# LANGUAGE QuasiQuotes                #-}
{-# LANGUAGE TemplateHaskell            #-}
{-# LANGUAGE TypeFamilies               #-}
import           Control.Monad.IO.Class  (liftIO)
import           Control.Monad.Logger    (runStderrLoggingT)
import           Database.Persist
import           Database.Persist.Postgresql
import           Database.Persist.TH
import Control.Monad.Trans.Reader (runReaderT)
import Data.IORef
import qualified Data.Map as Map

share [mkPersist sqlSettings, mkMigrate "migrateAll"] [persistLowerCase|
Person
    name String
    age Int Maybe
    deriving Show
BlogPost
    title String
    authorId PersonId
    deriving Show
|]

main :: IO ()
main = mockMigration migrateAll

--- Output:
-- CREATe TABLE "person"("id" SERIAL  PRIMARY KEY UNIQUE,"name" VARCHAR NOT NULL,"age" INT8 NULL)
-- CREATe TABLE "blog_post"("id" SERIAL  PRIMARY KEY UNIQUE,"title" VARCHAR NOT NULL,"author_id" INT8 NOT NULL)
-- ALTER TABLE "blog_post" ADD CONSTRAINT "blog_post_author_id_fkey" FOREIGN KEY("author_id") REFERENCES "person"("id")