Reword error message for BinaryFieldError (#1372)

src/PostgREST/Error.hs

@@ -224,7 +224,7 @@ instance JSON.ToJSON SimpleError where
   toJSON GucHeadersError           = JSON.object [
     "message" .= ("response.headers guc must be a JSON array composed of objects with a single key and a string value" :: Text)]
   toJSON (BinaryFieldError ct)          = JSON.object [
-    "message" .= ((toS (toMime ct) <> " requested but a single column was not selected") :: Text)]
+    "message" .= ((toS (toMime ct) <> " requested but more than one column was selected") :: Text)]
   toJSON ConnectionLostError       = JSON.object [
     "message" .= ("Database connection lost, retrying the connection." :: Text)]
 

test/Feature/QuerySpec.hs

@@ -950,7 +950,7 @@ spec actualPgVersion = do
     it "fails if a single column is not selected" $ do
       request methodGet "/images?select=img,name&name=eq.A.png" (acceptHdrs "application/octet-stream") ""
         `shouldRespondWith`
-        [json| {"message":"application/octet-stream requested but a single column was not selected"} |]
+        [json| {"message":"application/octet-stream requested but more than one column was selected"} |]
         { matchStatus = 406
         , matchHeaders = [matchContentTypeJson]
         }

test/Feature/RpcSpec.hs

@@ -482,7 +482,7 @@ spec actualPgVersion =
         it "fails if a single column is not selected" $
           request methodPost "/rpc/ret_rows_with_base64_bin" (acceptHdrs "application/octet-stream") ""
             `shouldRespondWith`
-            [json| {"message":"application/octet-stream requested but a single column was not selected"} |]
+            [json| {"message":"application/octet-stream requested but more than one column was selected"} |]
             { matchStatus = 406
             , matchHeaders = [matchContentTypeJson]
             }