Simple workaround to ignore FieldDoesNotExist with custom fields

admin_confirm/admin.py

@@ -1,9 +1,10 @@
+from contextlib import suppress
 import functools
 from typing import Dict
 from django.contrib.admin.exceptions import DisallowedModelAdminToField
 from django.contrib.admin.utils import flatten_fieldsets, unquote
 from django.core.cache import cache
-from django.core.exceptions import PermissionDenied
+from django.core.exceptions import PermissionDenied, FieldDoesNotExist
 from django.template.response import TemplateResponse
 from django.contrib.admin.options import TO_FIELD_VAR
 from django.utils.translation import gettext as _
@@ -175,33 +176,37 @@ def _display_for_changed_data(field, initial_value, new_value):
         changed_data = {}
         if add:
             for name, new_value in form.cleaned_data.items():
-                # Don't consider default values as changed for adding
-                field_object = model._meta.get_field(name)
-                default_value = field_object.get_default()
-                if new_value is not None and new_value != default_value:
-                    # Show what the default value is
-                    changed_data[name] = _display_for_changed_data(
-                        field_object, default_value, new_value
-                    )
+                # Ignore custom fields
+                with suppress(FieldDoesNotExist):
+                    # Don't consider default values as changed for adding
+                    field_object = model._meta.get_field(name)
+                    default_value = field_object.get_default()
+                    if new_value is not None and new_value != default_value:
+                        # Show what the default value is
+                        changed_data[name] = _display_for_changed_data(
+                            field_object, default_value, new_value
+                        )
         else:
             # Parse the changed data - Note that using form.changed_data would not work because initial is not set
             for name, new_value in form.cleaned_data.items():
+                # Ignore custom fields
+                with suppress(FieldDoesNotExist):
 
-                # Since the form considers initial as the value first shown in the form
-                # It could be incorrect when user hits save, and then hits "No, go back to edit"
-                obj.refresh_from_db()
+                    # Since the form considers initial as the value first shown in the form
+                    # It could be incorrect when user hits save, and then hits "No, go back to edit"
+                    obj.refresh_from_db()
 
-                field_object = model._meta.get_field(name)
-                initial_value = getattr(obj, name)
+                    field_object = model._meta.get_field(name)
+                    initial_value = getattr(obj, name)
 
-                # Note: getattr does not work on ManyToManyFields
-                if isinstance(field_object, ManyToManyField):
-                    initial_value = field_object.value_from_object(obj)
+                    # Note: getattr does not work on ManyToManyFields
+                    if isinstance(field_object, ManyToManyField):
+                        initial_value = field_object.value_from_object(obj)
 
-                if initial_value != new_value:
-                    changed_data[name] = _display_for_changed_data(
-                        field_object, initial_value, new_value
-                    )
+                    if initial_value != new_value:
+                        changed_data[name] = _display_for_changed_data(
+                            field_object, initial_value, new_value
+                        )
 
         return changed_data