Unify sheet type with grading schema

models

@@ -53,8 +53,6 @@ Sheet
     courseId        CourseId
     name            Text
     sheetType       SheetType
-    maxPoints       Double Maybe
-    requiredPoints  Double Maybe
     markingText     Text Maybe
     activeFrom      UTCTime
     activeTo        UTCTime
@@ -73,11 +71,11 @@ File
     title           FilePath
     content         ByteString Maybe -- Nothing iff this is a directory
     modified        UTCTime
-    deriving Show Eq Ord
+    deriving Show Eq
 Submission
     sheetId         SheetId    
     ratingBy        UserId  Maybe
-    ratingPoints    Double  Maybe
+    ratingPoints    Points  Maybe
     ratingComment   Text    Maybe 
     rated           UTCTime Maybe   
     created         UTCTime

src/Import/NoFoundation.hs

@@ -10,3 +10,5 @@ import Settings.StaticFiles  as Import
 import Yesod.Auth            as Import
 import Yesod.Core.Types      as Import (loggerSet)
 import Yesod.Default.Config2 as Import
+
+import Data.Fixed            as Import

src/Model/Types.hs

@@ -8,6 +8,8 @@ module Model.Types where
 
 import ClassyPrelude
 
+import Data.Fixed
+
 import Common
 
 import Database.Persist.TH
@@ -26,14 +28,22 @@ import qualified Data.CaseInsensitive as CI
 
 import Yesod.Core.Dispatch (PathPiece(..))
 import Data.Aeson (FromJSON(..), ToJSON(..), withText, Value(..))
+import Data.Aeson.TH (deriveJSON, defaultOptions)
 
 import GHC.Generics (Generic)
 import Data.Typeable (Typeable)
 
 
-data SheetType = Regular | Bonus | Extra 
+type Points = Centi
-  deriving (Show, Read, Eq, Ord, Enum, Bounded) 
+
-derivePersistField "SheetType"
+data SheetType
+  = Bonus  { maxPoints :: Points }
+  | Normal { maxPoints :: Points }
+  | Pass   { maxPoints, passingPoints :: Points }
+  | NotGraded
+  deriving (Show, Read, Eq)
+deriveJSON defaultOptions ''SheetType
+derivePersistFieldJSON "SheetType"
 
 data ExamStatus = Attended | NoShow | Voided
   deriving (Show, Read, Eq, Ord, Enum, Bounded)