Re: Newbie : Object copy - weird error :-)

Hello  Julio,

Ok, I see.

I try to create a way to archive (copy) the same object instance on an other DataBase.

I followed this advice : # https://stackoverflow.com/questions/21699707/python-how-to-copy-all-attibutes-from-base-class-to-derived-one


2018-06-27 14:56 GMT+02:00 Julio Biason <julio.biason@azion.com>:

Hi Mikael,

The problem is happening because of this: __init__() takes from 1 to 2 positional arguments but 11 were given

On your new __init__(), you added just 2 parameters: `self` and `source`. But you overwrote the default `models.Model` init, which receives way more parameters (the original signature for this function is `__init__(self, *args, **kwargs)`).

What are you actually trying to achieve with this?

On Tue, Jun 26, 2018 at 1:17 PM, <mickael.barbo@gmail.com> wrote:

Hi all :-)

I'd like to archive some data.

I did that :

class AbstractDataModel(models.Model):

xxx


class Meta:
        abstract = True


def __iter__(self):

        return iter([self.xxx, self.yyy, self.zzz, self.aaa,
            self.qqq, self.mode_bbb])


class DataModel(AbstractDataModel):


pass


class DataModelArchive(AbstractDataModel):
    # https://stackoverflow.com/questions/21699707/python-how-to-copy-all-attibutes-from-base-class-to-derived-one
    def __init__(self, source=None):
        if source is not None:
            self.__dict__.update(source.__dict__)

But when I want to access data in DataModelArchive, like DataModelArchive.objects.all() for example,
I get

Traceback (most recent call last):
  File "/home/.../tests.py", line 1090, in test_archive
    print(DataModelArchive.objects.all())
  File "/home/.../venv/lib/python3.6/site-packages/django/db/models/query.py", line 248, in __repr__
    data = list(self[:REPR_OUTPUT_SIZE + 1])
  File "/home/.../venv/lib/python3.6/site-packages/django/db/models/query.py", line 272, in __iter__
    self._fetch_all()
  File "/home/.../venv/lib/python3.6/site-packages/django/db/models/query.py", line 1179, in _fetch_all
    self._result_cache = list(self._iterable_class(self))
  File "/home/.../venv/lib/python3.6/site-packages/django/db/models/query.py", line 63, in __iter__
    obj = model_cls.from_db(db, init_list, row[model_fields_start:model_fields_end])
  File "/home/.../lib/python3.6/site-packages/django/db/models/base.py", line 507, in from_db
    new = cls(*values)
TypeError: __init__() takes from 1 to 2 positional arguments but 11 were given

What am I doing wrong ?

Thx

;-)

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