Union type deserialize to dict from json

The the Union type on a dataclass cannot be deserialized correctly from json. Example:

from dataclasses import dataclass
from dataclasses_json import dataclass_json
from typing import *


@dataclass_json
@dataclass(unsafe_hash=True)
class Gofy:
    p1: str

@dataclass_json
@dataclass(unsafe_hash=True)
class Foo:
    p2: str

@dataclass_json
@dataclass(unsafe_hash=True)
class Agg:
    inst: Union[Gofy, Foo]


if __name__ == '__main__':
    a = Agg(inst=Foo(p2='p2'))
    json_str = a.to_json()
    a_restored = Agg.from_json(json_str)
    print(type(a_restored.inst) ) # this will print the dict type
    assert a == a_restored # this check fails
    assert isinstance(a_restored.inst, Foo) # this check fails

[lainisourgod]

@lidatong hi! I experience the same issue on 0.4.1. Hack suggested by @FaraSeer solves the problem, but I guess it should be solved generally 😅

[FaraSeer]

@fanchunke1991, @obi1kenobi, please use the following way:

Agg.schema().dump(a)
a_restored = Agg.schema().load(json_str)

instead of

json_str = a.to_json()
a_restored = Agg.from_json(json_str)

I’m sorry for the inconvenience.