Support Django 2.0

[blag]

Closes #74.

[coveralls]

Coverage increased (+0.1%) to 92.0% when pulling 3ea4abc on blag:django-2.0 into 94ff6e1 on goinnn:master.

[Lyla-Fischer]

Some of the comments on this question seem to indicate that this might be an error in the migration files.

If the main change is in multiselectfield/db/fields.py:105 value = self._get_val_from_obj(obj), it kind of makes sense that there might be a migration error somewhere.

[Lyla-Fischer]

I have some changes here that allow for the example app to run using django 2.0 and runserver. The tests still fail in the same way, but it might be a hint as to what is going wrong.

[Lyla-Fischer]

I upvoted this question which seems to have the same issue that we are running into. There's no solution posted.

[chlab]

May I ask what the status is of this branch?

[olivierdalang]

@blag Isn't it value_from_object rather than val_from_object ?
With Django 2.2, I get 'MultiSelectField' object has no attribute 'val_from_object'...

[tomasgarzon]

Hi @blag , please check Travis errors, there seems to be several errors with some Django Version

[jayvdb]

It appears this has been fixed.

[jayvdb]

ping @goinnn / @blag . This can be closed?