Is there a way to make deep copies?

[ozaner]

The objects cloning section in the readme show how to make a copy of a mappable object with one of its properties changed. Is it possible to do that with nested properties? freezed, for example, allows cloning with changes in a lower level property:

final cloneCar = car.copyWith.leftWheel.tire(thickness: 32);

But dart_json_mappable's copyWith method only allows for one deep changes:

final cloneCar = JsonMapper.copyWith(car, {'color': 'blue'}); // same object but blue

If we were to change a deeper property like so:

final cloneCar = JsonMapper.copyWith(car, {'leftWheel': {'tire': {'thickness': 32}}}); // replaces entire leftWheel

It would replace the entirety of the top level property. If I was able to deep clone objects like above, then I could use mappable classes as immutable data classes. Is there any way to achieve this?

[k-paxian]

Sure, it's possible. Please refer this commit for a unit test demonstrating exactly that.

[k-paxian]

Fixed #209

[ozaner]

This probably works but I can't really test it since dart_json_mapper ^2.2.7+3 is not compatible with flutter due to versioning conflicts with some packages (e.g. flutter uses collection 1.16.0 but dart_json_mapper uses collection ^1.17.0).

[k-paxian]

I hear you @ozaner 2.2.7+4

[ozaner]

Thanks, but I'm not sure this works. Just to test, I created a fresh flutter project and added ran flutter pub add dart_json_mapper and the latest version that could be resolved was ^2.2.7. If I were to manually change that to ^2.2.7+4 in the pubspec.yaml, I get the following error message:

[flutter_application_1] flutter pub get
Running "flutter pub get" in flutter_application_1...           
Because every version of flutter_test from sdk depends on path 1.8.2 and dart_json_mapper >=2.2.7+2 depends on path ^1.8.3, flutter_test from sdk is incompatible with dart_json_mapper >=2.2.7+2.
So, because flutter_application_1 depends on both dart_json_mapper ^2.2.7+4 and flutter_test from sdk, version solving failed.
pub get failed (1; So, because flutter_application_1 depends on both dart_json_mapper ^2.2.7+4 and flutter_test from sdk, version solving failed.)
exit code 1

And I'm not sure path being incompatible with flutter_test is the only problem, because when I comment out flutter_test from the dev_dependencies I get another error:

[flutter_application_1] flutter pub get
Running "flutter pub get" in flutter_application_1...           
Because dart_json_mapper >=2.2.7+2 depends on analyzer ^5.3.1 which depends on collection ^1.17.0, dart_json_mapper >=2.2.7+2 requires collection ^1.17.0.
And because every version of flutter from sdk depends on collection 1.16.0, dart_json_mapper >=2.2.7+2 is incompatible with flutter from sdk.
So, because flutter_application_1 depends on both flutter from sdk and dart_json_mapper ^2.2.7+4, version solving failed.
pub get failed (1; So, because flutter_application_1 depends on both flutter from sdk and dart_json_mapper ^2.2.7+4, version solving failed.)
exit code 1

Which is strange because I see that you downgraded the collection dependency to 1.16.0 in 2.2.7+4.

[k-paxian]

ok, ^2.2.7+5 downgraded path as well @ozaner hope this helps 🤞