Fix verbose field name util for lazy text

django_filters/utils.py

@@ -172,9 +172,9 @@ def verbose_field_name(model, field_name):
     names = []
     for part in parts:
         if isinstance(part, ForeignObjectRel):
-            names.append(part.related_name)
+            names.append(force_text(part.related_name))
         else:
-            names.append(part.verbose_name)
+            names.append(force_text(part.verbose_name))
 
     return ' '.join(names)
 

tests/models.py

@@ -4,6 +4,7 @@
 from django import forms
 from django.db import models
 from django.utils.encoding import python_2_unicode_compatible
+from django.utils.translation import ugettext_lazy as _
 
 
 REGULAR = 0
@@ -45,7 +46,7 @@ def formfield(self, **kwargs):
 
 @python_2_unicode_compatible
 class User(models.Model):
-    username = models.CharField(max_length=255)
+    username = models.CharField(_('username'), max_length=255)
     first_name = SubCharField(max_length=100)
     last_name = SubSubCharField(max_length=100)
 

tests/test_utils.py

@@ -6,6 +6,7 @@
 from django.db import models
 from django.db.models.constants import LOOKUP_SEP
 from django.db.models.fields.related import ForeignObjectRel
+from django.utils.functional import Promise
 
 from django_filters.utils import (
     get_field_parts, get_model_field, resolve_field,
@@ -232,6 +233,14 @@ def test_backwards_related_field(self):
         verbose_name = verbose_field_name(Book, 'lovers__first_name')
         self.assertEqual(verbose_name, 'lovers first name')
 
+    def test_lazy_text(self):
+        # sanity check
+        field = User._meta.get_field('username')
+        self.assertIsInstance(field.verbose_name, Promise)
+
+        verbose_name = verbose_field_name(User, 'username')
+        self.assertEqual(verbose_name, 'username')
+
 
 class VerboseLookupExprTests(TestCase):