samuelcolvin
Subclass of `dict` is not recognized since 0.9
Python 3.9.5 (default, Jun 4 2021, 12:28:51)
Type 'copyright', 'credits' or 'license' for more information
IPython 8.1.1 -- An enhanced Interactive Python. Type '?' for help.
In [1]: import rtoml
In [2]: rtoml.VERSION
Out[2]: '0.8.0'
In [3]: class MyDict(dict): ...
In [4]: d = MyDict(a=1)
In [5]: rtoml.dumps(d)
Out[5]: 'a = 1\n'
Python 3.9.5 (default, Jun 4 2021, 12:28:51)
Type 'copyright', 'credits' or 'license' for more information
IPython 8.1.1 -- An enhanced Interactive Python. Type '?' for help.
In [1]: import rtoml
In [2]: rtoml.__version__
Out[2]: '0.9.0'
In [3]: class MyDict(dict): ...
In [4]: d = MyDict(a=1)
In [5]: d
Out[5]: {'a': 1}
In [6]: rtoml.dumps(d)
---------------------------------------------------------------------------
TomlSerializationError Traceback (most recent call last)
Input In [6], in <cell line: 1>()
----> 1 rtoml.dumps(d)
File ~/miniconda3/lib/python3.9/site-packages/rtoml/__init__.py:49, in dumps(obj, pretty)
46 else:
47 serialize = _rtoml.serialize
---> 49 return serialize(obj)
TomlSerializationError: {'a': 1} (MyDict) is not serializable to TOML
Makes sense we need to try the next tp_base like here.
Shouldn't be too hard to fix, would you like to have a try.
This still prevents me from upgrading rtoml to 0.11 for some of my projects.
Originally comments with the PR:
Can we add something to make it work at the python end?
For example, at dump(obj, ...) or dumps(obj, ...), can we do:
def dump(obj, ...):
if issubclass(type(obj), dict):
obj = dict(obj)
# continue logic
well the problem is it needs to be recursive.
You could add your own method to do this. By the way, it's better to use use type(x) in a lookup, then work through the __mro__, like we did in pydantic v1.
well the problem is it needs to be recursive.
That's a good point. Maybe I'll just wrap it myself.
Feel free to close.
Ultimate solution is https://github.com/pydantic/pydantic-core/issues/1339, I'll leave this open for that.