fix: is not working with upper/mixed case values (#2081)

CHANGELOG.md

@@ -10,6 +10,8 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 ### Fixed
 
  - #2020, Execute deferred constraint triggers when using `Prefer: tx=rollback` - @wolfgangwalther
+ - #2058, Return 204 No Content without Content-Type for PUT - @wolfgangwalther
+ - #2077, Fix `is` not working with upper or mixed case values like `NULL, TrUe, FaLsE` - @steve-chavez
 
 ## [9.0.0] - 2021-11-25
 

src/PostgREST/Request/Parsers.hs

@@ -199,10 +199,10 @@ pOpExpr pSVal = try ( string "not" *> pDelimiter *> (OpExpr True <$> pOperation)
       <|> pFts
       <?> "operator (eq, gt, ...)"
 
-    pTriVal = try (string "null"    $> TriNull)
-          <|> try (string "unknown" $> TriUnknown)
-          <|> try (string "true"    $> TriTrue)
-          <|> try (string "false"   $> TriFalse)
+    pTriVal = try (ciString "null"    $> TriNull)
+          <|> try (ciString "unknown" $> TriUnknown)
+          <|> try (ciString "true"    $> TriTrue)
+          <|> try (ciString "false"   $> TriFalse)
           <?> "null or trilean value (unknown, true, false)"
 
     pFts = do
@@ -213,6 +213,12 @@ pOpExpr pSVal = try ( string "not" *> pDelimiter *> (OpExpr True <$> pOperation)
     ops = M.filterWithKey (const . flip notElem ("in":"is":ftsOps)) operators
     ftsOps = M.keys ftsOperators
 
+    -- case insensitive char and string
+    ciChar :: Char -> GenParser Char state Char
+    ciChar c = char c <|> char (toUpper c)
+    ciString :: [Char] -> GenParser Char state [Char]
+    ciString = traverse ciChar
+
 pSingleVal :: Parser SingleVal
 pSingleVal = toS <$> many anyChar
 

test/Feature/QuerySpec.hs

@@ -85,6 +85,23 @@ spec actualPgVersion = do
         [json| [{"id": 3, "name": "wash the dishes", "done": null }] |]
         { matchHeaders = [matchContentTypeJson] }
 
+    it "matches with trilean values in upper or mixed case" $ do
+      get "/chores?done=is.NULL" `shouldRespondWith`
+        [json| [{"id": 3, "name": "wash the dishes", "done": null }] |]
+        { matchHeaders = [matchContentTypeJson] }
+
+      get "/chores?done=is.TRUE" `shouldRespondWith`
+        [json| [{"id": 1, "name": "take out the garbage", "done": true }] |]
+        { matchHeaders = [matchContentTypeJson] }
+
+      get "/chores?done=is.FAlSe" `shouldRespondWith`
+        [json| [{"id": 2, "name": "do the laundry", "done": false }] |]
+        { matchHeaders = [matchContentTypeJson] }
+
+      get "/chores?done=is.UnKnOwN" `shouldRespondWith`
+        [json| [{"id": 3, "name": "wash the dishes", "done": null }] |]
+        { matchHeaders = [matchContentTypeJson] }
+
     it "fails if 'is' used and there's no null or trilean value" $ do
       get "/chores?done=is.nil" `shouldRespondWith` 400
       get "/chores?done=is.ok"  `shouldRespondWith` 400