Created
March 20, 2021 21:42
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DataClass that can be converted to / from a dict
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| from dataclasses import asdict, dataclass, fields, is_dataclass | |
| @dataclass | |
| class BaseDataClass: | |
| def __post_init__(self): | |
| """ | |
| Convert all fields of type `dataclass` into an instance of the | |
| specified data class if the current value is of type dict. | |
| """ | |
| def unpack_values(field_type, val): | |
| """ unpack dict if field exists for this type """ | |
| return field_type( | |
| **{ | |
| k: v | |
| for k, v in val.items() | |
| if k in {ft.name for ft in fields(field_type)} | |
| } | |
| ) | |
| cls = type(self) | |
| for f in fields(cls): | |
| is_list_of_dataclass = ( | |
| hasattr(f.type, "_name") | |
| and f.type._name == "List" | |
| and is_dataclass(next(iter(f.type.__args__), None)) | |
| ) | |
| # if the field is not a dataclass, OR is not a List of dataclasses | |
| if not is_dataclass(f.type) and not is_list_of_dataclass: | |
| continue | |
| value = getattr(self, f.name) | |
| if isinstance(value, dict): | |
| new_value = unpack_values(f.type, value) | |
| setattr(self, f.name, new_value) | |
| elif isinstance(value, list): | |
| new_value = [] | |
| for v in value: | |
| if isinstance(v, dict): | |
| new_value.append(unpack_values(f.type.__args__[0], v)) | |
| setattr(self, f.name, new_value) | |
| @classmethod | |
| def from_dict(cls, values: dict): | |
| """ Ignore dict keys if they're not a field of the dataclass """ | |
| class_fields = {f.name for f in fields(cls)} | |
| return cls(**{k: v for k, v in values.items() if k in class_fields}) | |
| def to_dict(self): | |
| return asdict(self) |
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