Fixed #27067 -- Deprecated string_concat() in favor of format_lazy().

1 files changed, 4 insertions, 3 deletions

diff --git a/django/contrib/postgres/utils.py b/django/contrib/postgres/utils.py
index 1563149c7e..a2bbb72f36 100644
--- a/django/contrib/postgres/utils.py
+++ b/django/contrib/postgres/utils.py
@@ -2,7 +2,7 @@ from __future__ import unicode_literals
 
 from django.core.exceptions import ValidationError
 from django.utils.functional import SimpleLazyObject
-from django.utils.translation import string_concat
+from django.utils.text import format_lazy
 
 
 def prefix_validation_error(error, prefix, code, params):
@@ -15,10 +15,11 @@ def prefix_validation_error(error, prefix, code, params):
         return ValidationError(
             # We can't simply concatenate messages since they might require
             # their associated parameters to be expressed correctly which
-            # is not something `string_concat` does. For example, proxied
+            # is not something `format_lazy` does. For example, proxied
             # ungettext calls require a count parameter and are converted
             # to an empty string if they are missing it.
-            message=string_concat(
+            message=format_lazy(
+                '{}{}',
                 SimpleLazyObject(lambda: prefix % params),
                 SimpleLazyObject(lambda: error.message % error_params),
             ),