haskell/esqueleto
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Manually avoid spurious warnings.

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http://hackage.haskell.org/trac/ghc/ticket/6124
This commit is contained in:
Felipe Lessa 2012-09-03 21:40:28 -03:00
parent ea4a58a970
commit 1230245749
1 changed files with 6 additions and 0 deletions
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6
src/Database/Esqueleto/Internal/Sql.hs
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@ -111,11 +111,13 @@ instance Esqueleto SqlQuery SqlExpr SqlPersist where
EEntity (I ident) ^. field = ERaw $ \esc -> (ident <> ("." <> name esc field), [])
where name esc = esc . fieldDB . persistFieldDef
_ ^. _ = error "Esqueleto/Sql/(^.): never here (see GHC #6124)"
val = ERaw . const . (,) "?" . return . toPersistValue
not_ (ERaw f) = ERaw $ \esc -> let (b, vals) = f esc
in ("NOT " <> parens b, vals)
not_ _ = error "Esqueleto/Sql/not_: never here (see GHC #6124)"
(==.) = binop " = "
(>=.) = binop " >= "
@ -141,6 +143,7 @@ binop op (ERaw f1) (ERaw f2) = ERaw f
(b2, vals2) = f2 esc
in ( parens b1 <> op <> parens b2
, vals1 <> vals2 )
binop _ _ _ = error "Esqueleto/Sql/binop: never here (see GHC #6124)"
-- | Execute an Esqueleto's 'SqlQuery' inside @persistent@'s
@ -227,6 +230,7 @@ makeFrom esc = uncommas . map mk
makeWhere :: Escape -> WhereClause -> (TLB.Builder, [PersistValue])
makeWhere _ NoWhere = mempty
makeWhere esc (Where (ERaw f)) = first ("\nWHERE " <>) (f esc)
makeWhere _ _ = error "Esqueleto/Sql/makeWhere: never here (see GHC #6124)"
parens :: TLB.Builder -> TLB.Builder
@ -268,6 +272,7 @@ instance PersistEntity a => SqlSelect (SqlExpr (Entity a)) (Entity a) where
in (length (entityFields ed) + 1, process ed, mempty)
getEntityVal :: SqlExpr (Entity a) -> a
getEntityVal = error "Database.Esqueleto.SqlSelect.getEntityVal"
sqlSelectCols _ _ = error "Esqueleto/Sql/sqlSelectCols[Entity]: never here (see GHC #6124)"
sqlSelectProcessRow (idCol:ent) =
Entity <$> fromPersistValue idCol
<*> fromPersistValues ent
@ -276,6 +281,7 @@ instance PersistEntity a => SqlSelect (SqlExpr (Entity a)) (Entity a) where
instance PersistField a => SqlSelect (SqlExpr (Single a)) (Single a) where
sqlSelectCols esc (ERaw f) = let (b, vals) = f esc
in (1, parens b, vals)
sqlSelectCols _ _ = error "Esqueleto/Sql/sqlSelectCols[Single]: never here (see GHC #6124)"
sqlSelectProcessRow [pv] = Single <$> fromPersistValue pv
sqlSelectProcessRow _ = Left "SqlSelect (Single a): wrong number of columns."