Default values handling

Sometimes there is a default value, or default factory in the target class, and you want to use the default value instead of mapping some field from the source class. If you mark the field with init_with_defaul() or with ignore(), it will use the default, even if there is a field with the same name. The two marks init_with_default and ignore are equivalent.

>>> @dataclass
... class PersonEntity:
...     name: str
...     age: int
...     id: UUID = field(default_factory=uuid4)
...     alive: bool = True
>>>
>>> @mapper(PersonEntity, {"id": init_with_default(), "alive": ignore()})
... @dataclass
... class Person:
...     id: UUID
...     name: str
...     age: int
>>>
>>> person = Person(name="Jake", age=27, id=UUID("00000000-0000-0000-0000-000000000000"))
>>> map_to(person, PersonEntity)
PersonEntity(name='Jake', age=27, id=UUID('38fc07e1-677e-40ef-830c-00e284056dd8'), alive=True)