Use DeriveAnyClass, add readDayPaths

src/Yore/DB.hs

@@ -1,10 +1,13 @@
+{-# LANGUAGE DeriveAnyClass #-}
 {-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE DuplicateRecordFields #-}
 
 module Yore.DB
   ( DayIndex (..)
   , createDayFile
   , createDayIndex
   , readDayIndex
+  , readDayPaths
   , Table (..)
   , getTables
 ) where
@@ -18,9 +21,7 @@ import qualified Database.PostgreSQL.Opium as Opium
 data Table = Table
   { schema :: String
   , name :: String
-  } deriving (Show, Generic)
-
-instance Opium.FromRow Table
+  } deriving (Show, Generic, Opium.FromRow)
 
 getTables :: Opium.Connection -> IO (Either Opium.Error [Table])
 getTables = Opium.fetch_ "SELECT table_schema AS schema, table_name AS name FROM information_schema.tables"
@@ -28,9 +29,13 @@ getTables = Opium.fetch_ "SELECT table_schema AS schema, table_name AS name FROM
 data DayIndex = DayIndex
   { id  :: Int
   , day :: Day
-  } deriving (Show, Generic)
+  } deriving (Show, Generic, Opium.FromRow)
 
-instance Opium.FromRow DayIndex
+data DayFile = DayFile
+  { id :: Int
+  , day_id :: Int
+  , relative_path :: String
+  } deriving (Show, Generic, Opium.FromRow)
 
 createDayIndex :: Day -> Opium.Connection -> IO (Either Opium.Error DayIndex)
 createDayIndex date = ex runIdentity .
@@ -49,5 +54,11 @@ readDayIndex date =
     "SELECT * FROM yore.day_index WHERE day = $1"
     (Identity date)
 
+readDayPaths :: Day -> Opium.Connection -> IO (Either Opium.Error [(DayIndex, DayFile)])
+readDayPaths date =
+  Opium.fetch
+    "SELECT * FROM yore.day_index LEFT JOIN yore.day_file ON day_index.id = day_id WHERE day = $1"
+    (Identity date)
+
 ex :: (a -> b) -> IO (Either e a) -> IO (Either e b)
 ex = fmap . fmap