Getting null values while saving json data in file using nlohmann json - c++

Question

I am using nlohmann json to create ans save some json values. But when I look at the file, I get null values in between the json. Below is how it looks like:
{
"Created": "2019-07-03T13:54:32Z",
"DataId": "BHI-201-U8",
"Data": [
{
"Name": "Andrew",
"Attended": "Yes"
},
{
"Name": "John",
"Attended": "Yes"
},
null, <-- unexpected null
{
"Name": "Ronny",
"Attended": "No"
},
null, <-- unexpected null
null, <-- unexpected null
{
"Name": "Mathew",
"Attended": "Yes"
}
],
"Type": "Person"
}
As you can see in the above json data, I am getting some unexpected null. Below is how I am saving it:
#include "nlohmann/json.hpp"
using nlohmann::json;
int main()
{
json outJson;
//some code
string outFile = "output.json";
for (const auto &data : trackedData->Detections())
{
//some code
outJson["Data"][data.id]["Name"] = data.name;
outJson["Data"][data.id]["Attended"] = data.status;
}
outJson["Created"] = created;
outJson["DataId"] = "BHI-201-U8";
outJson["Type"] = "Person";
std::ofstream output_file(outFile);
output_file << outJson.dump(4 , ' ', false);
output_file.close();
}
How can I remove these extra null from the code.

Answer 1

trackedData->Detections() returns a list of objects or structures and some of them are null-valued, hence nulls in the json. Try to do null-checking before adding data entry into json.
for (const auto &data : trackedData->Detections())
{
//some code
if (data != NULL)
{
outJson["Data"][data.id]["Name"] = data.name;
outJson["Data"][data.id]["Attended"] = data.status;
}
}