Adds an error message for duplicate labels

HISTORY.rst

@@ -4,6 +4,9 @@ Changelog
 Unreleased
 ~~~~~~~~~~
 
+- Adds an error message for duplicate labels.
+  [href]
+
 - Fixes fieldsets only showing up once on static forms.
   [href]
 

onegov/form/locale/de_ch/LC_MESSAGES/onegov.form.po

@@ -7,7 +7,7 @@
 msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE 1.0\n"
-"POT-Creation-Date: 2015-10-15 09:43+0200\n"
+"POT-Creation-Date: 2015-11-16 16:31+0100\n"
 "PO-Revision-Date: 2015-10-15 09:43+0200\n"
 "Last-Translator: Denis Krienbühl <denis.krienbuehl@seantis.ch>\n"
 "Language-Team: German\n"
@@ -36,6 +36,10 @@ msgstr ""
 msgid "The syntax on line {line} is not valid."
 msgstr "Der Syntax in der {line}. Zeile ist ungültig."
 
+#, python-format
+msgid "The field '{label}' exists more than once."
+msgstr "Das Feld '{label}' kommt doppelt vor."
+
 msgid "Uploaded file"
 msgstr "Hochgeladene Datei"
 

onegov/form/validators.py

@@ -4,7 +4,7 @@
 from mimetypes import types_map
 from onegov.form import _
 from onegov.form.core import with_options
-from onegov.form.errors import InvalidFormSyntax
+from onegov.form.errors import InvalidFormSyntax, DuplicateLabelError
 from stdnum.exceptions import ValidationError as StdnumValidationError
 from wtforms import ValidationError
 
@@ -111,6 +111,7 @@ class ValidFormDefinition(object):
     message = _("The form could not be parsed.")
     email = _("Define at least one required e-mail field ('E-Mail * = @@@')")
     syntax = _("The syntax on line {line} is not valid.")
+    duplicate = _("The field '{label}' exists more than once.")
 
     def __init__(self, require_email_field=True):
         self.require_email_field = require_email_field
@@ -129,6 +130,10 @@ def __call__(self, form, field):
                 raise ValidationError(
                     field.gettext(self.syntax).format(line=e.line)
                 )
+            except DuplicateLabelError as e:
+                raise ValidationError(
+                    field.gettext(self.duplicate).format(label=e.label)
+                )
             except AttributeError:
                 raise ValidationError(field.gettext(self.message))
             else: