Fixes #8103 -- Select widget should only allow for one selected option

git-svn-id: http://code.djangoproject.com/svn/django/trunk@16848 bcc190cf-cafb-0310-a4f2-bffc1f526a37

1 files changed, 12 insertions, 2 deletions

diff --git a/django/forms/widgets.py b/django/forms/widgets.py
index 9b95c31c92..3797c163bd 100644
--- a/django/forms/widgets.py
+++ b/django/forms/widgets.py
@@ -499,6 +499,8 @@ class CheckboxInput(Widget):
         return bool(initial) != bool(data)
 
 class Select(Widget):
+    allow_multiple_selected = False
+
     def __init__(self, attrs=None, choices=()):
         super(Select, self).__init__(attrs)
         # choices can be any iterable, but we may need to render this widget
@@ -518,14 +520,20 @@ class Select(Widget):
 
     def render_option(self, selected_choices, option_value, option_label):
         option_value = force_unicode(option_value)
-        selected_html = (option_value in selected_choices) and u' selected="selected"' or ''
+        if option_value in selected_choices:
+            selected_html = u' selected="selected"'
+            if not self.allow_multiple_selected:
+                # Only allow for a single selection.
+                selected_choices.remove(option_value)
+        else:
+            selected_html = ''
         return u'<option value="%s"%s>%s</option>' % (
             escape(option_value), selected_html,
             conditional_escape(force_unicode(option_label)))
 
     def render_options(self, choices, selected_choices):
         # Normalize to strings.
-        selected_choices = set([force_unicode(v) for v in selected_choices])
+        selected_choices = set(force_unicode(v) for v in selected_choices)
         output = []
         for option_value, option_label in chain(self.choices, choices):
             if isinstance(option_label, (list, tuple)):
@@ -571,6 +579,8 @@ class NullBooleanSelect(Select):
         return initial != data
 
 class SelectMultiple(Select):
+    allow_multiple_selected = True
+
     def render(self, name, value, attrs=None, choices=()):
         if value is None: value = []
         final_attrs = self.build_attrs(attrs, name=name)