JSONQuery not returning the correct value

[Alexandre-Dhalenne]

Hello Daniel !

I just updated jsoncons to 0.168.0 from 0.159.0 and I am facing a bug.
It seems applying a JSONPath to my JSON is not giving same outputs than before.
Here is an example JSON :

{
      "version": "EC_v1",
      "data": {
        "paymentData": {
          "CCX": {
            "CCN": "3569990010095841",
            "CVV": "737",
            "DDMM": "0420"
          },
          "eciIndicator": "5"
        },
        "paymentDataList": [
          {
            "CCN": "3569990010095840",
            "CVV": "737",
            "DDMM": "0420"
          },
          {
            "CCN": "3569990010095841",
            "CVV": "737",
            "DDMM": "0421"
          },
          {
            "CCN": "3569990010095842",
            "CVV": "737",
            "DDMM": "0422"
          },
          {
            "CCN": "3569990010095843",
            "CVV": "737",
            "DDMM": "0423"
          },
          {
            "CCN": "3569990010095844",
            "CVV": "737",
            "DDMM": "0424"
          }
        ]
      }
    }

I want to apply the JSONPath $.data.paymentDataList[0,(@.length-1)].DDMM
Expected output :

[
  "$['data']['paymentDataList'][0]['DDMM']",
  "$['data']['paymentDataList'][4]['DDMM']"
]

Actual Output :

[
  "$['data']['paymentDataList'][0]['DDMM']",
  "$['data']['paymentDataList']['DDMM']"
]

cpp code used :

#include <jsoncons/json.hpp>
auto _jsonPath = "$.data.paymentDataList[0,(@.length-1)].DDMM";
jsoncons::ojson jsonObject = jsoncons::ojson::parse(exampleInput); // where exampleInput is a string containing the JSON above.
jsoncons::ojson result = jsoncons::jsonpath::json_query(jsonObject, _jsonPath, jsoncons::jsonpath::result_type::path);
std::vector<std::string> paths = result.as<std::vector<std::string>>();
for (const auto& path : paths) {
    std::cout<< path << std::endl;
}

Maybe I do something wrong but I checked release notes and this should be valid ?

Thanks a lot for your help.

Regards,

• Compiler: g++
• Architecture (e.g. x86, x64) x64
• Operating system: linux

What jsoncons library version?

• Latest release 0.168.0

[danielaparker]

You're right, it looks like we're not computing the path component for the expression part (@.length-1)] in the union. It works correctly for values, but not paths.

We'll fix that, but in the meantime, note that an equivalent (and I think preferred) query is

$.data.paymentDataList[0,-1].DDMM

which gives the expected results

["$['data']['paymentDataList'][0]['DDMM']","$['data']['paymentDataList'][4]['DDMM']"]

[Alexandre-Dhalenne]

Indeed I spotted this error in my unit tests that aims at testing the union 😄

Thanks for your fast answer I will disable my unit test while waiting for a new release !

Have a good day,

[danielaparker]

It's fixed on master.

[danielaparker]

Fixed in 0.168.1