class MyAdmin(admin.ModelAdmin):

    def __init__(self, model, admin_site):
        general_fields = ['notes', 'created_at', 'updated_at']
fields = [f.name for f in self.model._meta.fields if f.name not in
    general_fields]
self.fields = fields + general_fields
super(admin.ModelAdmin, self).__init__(model, admin_site)
Reordering fields in Django model