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allow returning custom id columns from queries if they're not composite

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This commit is contained in:
Alberto Valverde 2015-04-01 19:06:10 +02:00
parent 12a2d2de2b
commit 48cae5396e
1 changed files with 4 additions and 1 deletions
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5
src/Database/Esqueleto/Internal/Sql.hs
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@ -1093,7 +1093,10 @@ instance PersistEntity a => SqlSelect (SqlExpr (Maybe (Entity a))) (Maybe (Entit
instance PersistField a => SqlSelect (SqlExpr (Value a)) (Value a) where
sqlSelectCols info (ERaw p f) = let (b, vals) = f info
in (parensM p b, vals)
sqlSelectCols _ (ERawList _) = unexpectedCompositeKeyError
sqlSelectCols info (ERawList f) = let (b, vals) = f info
in case b of
[b'] -> (parensM Parens b', vals)
_ -> unexpectedCompositeKeyError
sqlSelectColCount = const 1
sqlSelectProcessRow [pv] = Value <$> fromPersistValue pv
sqlSelectProcessRow _ = Left "SqlSelect (Value a): wrong number of columns."