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{-# LANGUAGE FlexibleInstances #-}
module Model where
import ClassyPrelude.Yesod
import Database.Persist.Quasi
import Control.Monad.Writer
import Data.Text (Text)
import qualified Data.Text as Text
import Data.Aeson
-- You can define all of your database entities in the entities file.
-- You can find more information on persistent and how to declare entities
-- at:
-- http://www.yesodweb.com/book/persistent/
share [mkPersist sqlSettings, mkMigrate "migrateAll"]
$(persistFileWith lowerCaseSettings "config/models")
instance Ord Item where
x `compare` y = mconcat
[ (isNothing $ itemOpened x) `compare` (isNothing $ itemOpened y)
, itemOpened x `compare` itemOpened y
, (isNothing $ itemExpires x) `compare` (isNothing $ itemExpires y)
, itemExpires x `compare` itemExpires x
, itemKind x `compare` itemKind x
, itemBought x `compare` itemBought x
]
instance ToJSON Item where
toJSON Item{..} = object $
[ "kind" .= itemKind
] ++ maybe [] (\x -> ["bought" .= x]) itemBought
++ maybe [] (\x -> ["expires" .= x]) itemExpires
++ maybe [] (\x -> ["opened" .= x]) itemOpened
instance FromJSON Item where
parseJSON = withObject "Item" $ \obj -> do
itemKind <- obj .: "kind"
let
itemNormKind = normalizeKind itemKind
itemBought <- obj .:? "bought"
itemExpires <- obj .:? "expires"
itemOpened <- obj .:? "opened"
return Item{..}
instance ToJSON (Entity Item) where
toJSON = entityIdToJSON
instance FromJSON (Entity Item) where
parseJSON = entityIdFromJSON
instance ToJSON Reference where
toJSON Reference{..} = String referenceKind
instance FromJSON Reference where
parseJSON = withText "Reference" $ \referenceKind -> do
let
referenceNormKind = normalizeKind referenceKind
return Reference{..}
instance ToJSON (Entity Reference) where
toJSON = keyValueEntityToJSON
instance FromJSON (Entity Reference) where
parseJSON = keyValueEntityFromJSON
normalizeKind :: Text -> Text
normalizeKind = Text.strip . Text.toCaseFold
data ItemDiff = DiffKind Text
| DiffBought (Maybe Day)
| DiffExpires (Maybe Day)
| DiffOpened (Maybe Day)
newtype ItemDiffs = ItemDiffs [ItemDiff]
instance FromJSON ItemDiffs where
parseJSON = withObject "ItemDiff" $ \obj -> fmap ItemDiffs . execWriterT $ do
tell =<< maybe [] (pure . DiffKind) <$> lift (obj .:? "kind")
tell =<< maybe [] (pure . DiffBought) <$> lift (obj .:! "bought")
tell =<< maybe [] (pure . DiffExpires) <$> lift (obj .:! "expires")
tell =<< maybe [] (pure . DiffOpened) <$> lift (obj .:! "opened")
toUpdate :: ItemDiffs -> [Update Item]
toUpdate (ItemDiffs ds) = do
x <- ds
case x of
DiffKind t -> [ ItemKind =. t
, ItemNormKind =. normalizeKind t
]
DiffBought d -> [ ItemBought =. d ]
DiffExpires d -> [ ItemExpires =. d ]
DiffOpened d -> [ ItemOpened =. d ]
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