Use SQLAlchemy defaults in fields

[geoolekom]

Now, if a SQLA Column has a default value, it is used in the admin panel. If it is a scalar, then the value is used directly. If it is a function or SQL expression, the extra help text is displayed.

[hasansezertasan]

Related to #491

[geoolekom]

Sorry, @hasansezertasan, any updates on this PR?

[hasansezertasan]

Sorry, @hasansezertasan, any updates on this PR?

It's OK. I was the one who volunteered but I couldn't get my hands free for this. I'll work on it when I get a chance.

[jowilf]

Suggested change

	default: str = ""
	default: Optional[Any] = None

[jowilf]

Thank you, @geoolekom, for submitting this pull request. Would you be interested in implementing it for other backends as well?

[geoolekom]

Thank you, @geoolekom, for submitting this pull request. Would you be interested in implementing it for other backends as well?

Unfortunately, for now I don't have much time to implement other backends in this PR. Perhaps later, in a separate pull request.

For now, I fixed failed CI checks for SQLA backend. Could you trigger the pipeline again?

[alidiusk]

Hi, I'm wondering if there's any work remaining on this that I could assist with. It would be nice to have for a project I'm working on.

[jowilf]

sorry @geoolekom for taking to long to review. it looks good, we just need to solve conflicts with the base branch

[KozyrevIvan]

Still missing default in CollectionField and ListField

I think it can be done like this

@dataclass(init=False)
class CollectionField(BaseField):
   ....
    def __init__(
        self, name: str, fields: Sequence[BaseField], required: bool = False
    ) -> None:
        self.name = name
        self.fields = fields
        self.required = required
        self.default = {field.name: field.default for field in fields} # Set default values
        super().__post_init__()
        self._propagate_id()