Correctly display errors.

fix #387

modoboa/admin/models.py

@@ -760,24 +760,24 @@ class Mailbox(DatesAware):
         return True
 
     @staticmethod
-    def resolve_uid(value):
+    def resolve_id(value, idname, errmsg):
         if value.isdigit():
             return value
         try:
-            uid = pwd.getpwnam(value).pw_uid
+            rid = getattr(pwd.getpwnam(value), idname)
         except KeyError:
-            raise AdminError(_("%s is not a valid uid/username" % value))
-        return uid
+            raise AdminError(errmsg)
+        return rid
+
+    @staticmethod
+    def resolve_uid(value):
+        err = _("%s is not a valid uid/username" % value)
+        return Mailbox.resolve_id(value, "pw_uid", err)
 
     @staticmethod
     def resolve_gid(value):
-        if value.isdigit():
-            return value
-        try:
-            gid = pwd.getpwnam(value).pw_gid
-        except KeyError:
-            raise AdminError(_("%s is not a valid gid/groupname" % value))
-        return gid
+        err = _("%s is not a valid gid/groupname" % value)
+        return Mailbox.resolve_id(value, "pw_gid", err)
 
     def set_ownership(self):
         """Set uid and gid for this mailbox

modoboa/admin/templates/admin/parameters.html

@@ -1,7 +1,7 @@
-{% load i18n %}
+{% load i18n %}{% load url from future %}
 {% url "modoboa.admin.views.saveparameters" as action %}
 <h2>{% trans "Parameters" %} <small>{% trans "Configure Modoboa" %}</small></h2><hr />
-<form id="settings_form" method="POST" action="{{ action }}" class="form-horizontal">
+<form id="settings_form" method="POST" action="{% url 'modoboa.admin.views.saveparameters' %}" class="form-horizontal">
   {% include "common/parameters.html" %}
 </form>
 <hr>