The formatting does not work on read-only fields

My code setup is as follows:

models.py

class MyModel(models.Model):
    structure = JSONField(default=dict, blank=True, null=True)
    static_structure = JSONField(default=dict, blank=True, null=True, editable=False)

admin.py

class MyModelAdmin(admin.ModelAdmin):
    formfield_overrides = {
        JSONField: {'widget': PrettyJSONWidget }
    }

    def get_readonly_fields(self, request, obj=None):
        if obj:
            return ('static_structure')
        else:
            return super(MyModelAdmin, self).get_readonly_fields(request, obj)

admin.site.register(MyModel, MyModelAdmin)

In other words, one of the JSONFields is not editable and read-only. It appears on my admin panel, but its not being affected by the widget which renders the other field as formatted JSON.

Is this by design? And is there any way to have the formatting work for read-only fields?

[jordanmkoncz]

I ran into this issue too. I tried your workaround @BenVosper and while this works for a user who has elevated permissions for a model, if the user only has the “view” permission for a model then Django automatically makes all fields read-only and as such django-prettyjson does nothing and the user just sees the plain text / string version of the JSON.

@kevinmickey any thoughts on how to get django-prettyjson to work for read-only fields?

[marvinsilva]

Since including a JSONField in readonly_fields prevents the PrettyJSONWidget from being used, instead of overriding ModelAdmin.get_formas suggested, it is possible to pass the disable parameter as an attribute for PrettyJSONWidget too:

formfield_overrides = {
    JSONField: {
        "widget": PrettyJSONWidget(
            attrs={"initial": "parsed", "disabled": True}
        )
    }
}

Working with Django 3.1.13, django-prettyjson 0.4.1