Pass the model instance to schema callable about django-jsonform HOT 5 CLOSED

This doesn't seem possible.

The form field and the widget is associated with a model field only once when the django process starts. Therefore, the widget has no way of accessing the model instance.

from django-jsonform.

Okay, I'll add this. Seems like this is the best that can be done about this feature.

from django-jsonform.

I've released this feature as per your suggestions in version 2.8.0.

Thank you for this.

from django-jsonform.

Hi there,

I've just figured out how to implement this.

You are right, by default, it is really not possible to access model instance during the widget render process but it is possible to pass it if you have custom model admin form - which is highly likely - and if not, it's really not hard to create one.

# admin.py
class FooAdminForm(forms.ModelForm):
    class Meta:
        model = Foo
        exclude = []

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.fields['bar'].widget.instance = self.instance # passing instance to the field called bar

@admin.register(Foo)
class FooAdmin(admin.ModelAdmin):
    form = FooAdminForm

So how about giving the possibility for developers to access the instance if they really need it by just take look if there is an instance attribute available in widgets.JSONFormWidget during the render method and pass it to shcema callable if there it is:

# django_jsonform/widgets.py
class JSONFormWidget(forms.Widget):
    # from line 17
    def render(self, name, value, attrs=None, renderer=None):
        if callable(self.schema):
            instance = getattr(self, 'instance') if hasattr(self, 'instance') else None
            schema = self.schema() if instance is None else self.schema(instance)
        else:
            schema = self.schema

from django-jsonform.

Sounds promising! Thank you!

from django-jsonform.