Fix #232

Author: Ash-Crow

dsfr/test/test_fields.py

@@ -1,3 +1,4 @@
+from django import forms
 from django.template import Context, Template
 from django.test import SimpleTestCase
 from django.utils.datastructures import MultiValueDict
@@ -7,6 +8,37 @@
 from dsfr.widgets import NumberCursor
 
 
+class FormFieldTestCase(SimpleTestCase):
+    class DummyForm(DsfrBaseForm):
+        user_name = forms.CharField(
+            label="Nom d’utilisateur",
+            max_length=100,
+            widget=forms.TextInput(
+                attrs={
+                    "autocomplete": "username",
+                }
+            ),
+        )
+
+    def test_full_form_works(self):
+        rendered = Template("{{form}}").render(
+            Context({"form": FormFieldTestCase.DummyForm()})
+        )
+        self.assertIn("Nom d’utilisateur", rendered)
+
+    def test_correct_field_works(self):
+        rendered = Template(
+            "{% load dsfr_tags %}{% dsfr_form_field form.user_name %}"
+        ).render(Context({"form": FormFieldTestCase.DummyForm()}))
+        self.assertIn("Nom d’utilisateur", rendered)
+
+    def test_incorrect_field_raises_error(self):
+        with self.assertRaises(AttributeError):
+            _rendered = Template(
+                "{% load dsfr_tags %}{% dsfr_form_field form.unknown_field %}"
+            ).render(Context({"form": FormFieldTestCase.DummyForm()}))
+
+
 class IntegerRangeFieldTestCase(SimpleTestCase):
     class DummyForm(DsfrBaseForm):
         integer_range_field = IntegerRangeField()

dsfr/utils.py

@@ -117,7 +117,12 @@ def generate_summary_items(sections_names: list) -> list:
     return items
 
 
-def dsfr_input_class_attr(bf: BoundField):
+def dsfr_input_class_attr(bf: BoundField, *args, **kwargs):
+    if not bf:
+        raise AttributeError(
+            "Either dsfr_form_field or dsfr_input_class_attr has been called with a non-existing field name."
+        )
+
     if bf.is_hidden:
         return bf
     if "class" not in bf.field.widget.attrs: