Add missing tests for NOT IN accepting empty values and refactor

Go back to operators map since the previously defined
Operator constructors added innecesary complexity also
rename Path to EmbedPath

src/PostgREST/OpenAPI.hs

@@ -8,11 +8,12 @@ module PostgREST.OpenAPI (
 
 import           Control.Lens
 import           Data.Aeson                  (decode, encode)
+import qualified Data.HashMap.Strict         as M
 import           Data.HashMap.Strict.InsOrd  (InsOrdHashMap, fromList)
 import           Data.Maybe                  (fromJust)
+import qualified Data.Set                    as Set
 import           Data.String                 (IsString (..))
 import           Data.Text                   (unpack, pack, concat, intercalate, init, tail, toLower)
-import qualified Data.Set                    as Set
 import           Network.URI                 (parseURI, isAbsoluteURI,
                                               URI (..), URIAuth (..))
 
@@ -23,7 +24,7 @@ import           Data.Swagger
 import           PostgREST.ApiRequest        (ContentType(..))
 import           PostgREST.Config            (prettyVersion)
 import           PostgREST.Types             (Table(..), Column(..), PgArg(..),
-                                              Proxy(..), ProcDescription(..), toMime, Operator(..))
+                                              Proxy(..), ProcDescription(..), toMime, operators)
 
 makeMimeList :: [ContentType] -> MimeList
 makeMimeList cs = MimeList $ map (fromString . toS . toMime) cs
@@ -72,7 +73,7 @@ makeOperatorPattern =
   intercalate "|"
   [ concat ["^", x, y, "[.]"] |
     x <- ["not[.]", ""],
-    y <- map show [Equals ..] ]
+    y <- M.keys operators ]
 
 makeRowFilter :: Column -> Param
 makeRowFilter c =