Qt5 Quickly convert json to an object without converting field by field

[Pl45m4]

@Xrtero

Maybe this topic helps:

• https://stackoverflow.com/questions/19822211/qt-parsing-json-using-qjsondocument-qjsonobject-qjsonarray

[Christian Ehrlicher]

@Xrtero said in Qt5 Quickly convert json to an object without converting field by field:

. I need to parse this response (JSON) into an object.

You already do this...

[Xrtero]

@Christian-Ehrlicher

Therefore, I'm wondering if there's a more convenient method. For instance, if the JSON is large and the object to be converted has many fields, manually writing the code would involve a significant amount of work.

[Christian Ehrlicher]

What should be more convenient here? How should some magic code know which attribute you want? Noone else but you can know what you want to retrieve from the json.

[JonB]

@Xrtero IMO you are worrying about something you should not be worrying about.

[hskoglund]

With a bit of luck reflection will be included in C++26 and then you can write something like this:

MyObject myObject;
for (auto d : std::meta::nonstatic_data_members_of(^MyObject))
    myObject.[:d:] = json["data"][[:d:]].toInt();

I.e. steps through all your different data members in a loop (assuming they are all of the type int).
More info here

[Xrtero]

@Christian-Ehrlicher said in Qt5 Quickly convert json to an object without converting field by field:

What should be more convenient here? How should some magic code know which attribute you want? Noone else but you can know what you want to retrieve from the json.

My current idea is to implement this feature using Qt's reflection, which would allow us to access each field and convert it into the corresponding type.

[Xrtero]

@JonB

just to make convert json convenient and reduce some repetitive work.

[Xrtero]

@hskoglund said in Qt5 Quickly convert json to an object without converting field by field:

With a bit of luck reflection will be included in C++26 and then you can write something like this:

MyObject myObject;
for (auto d : std::meta::nonstatic_data_members_of(^MyObject))
    myObject.[:d:] = json["data"][[:d:]].toInt();

I.e. steps through all your different data members in a loop (assuming they are all of the type int).
More info here

Qt also has the same feature, and that's what I was planning to do.
Finally, someone understands my idea. Thank you!

[JonB]

@Xrtero
So you will use a feature of C++ 26, and it will only work if all your properties are of type int. You could do something like this easily if you changed to a language like Python. Anyway if this is what you are looking for and you are happy that is good.