Fixed #3114 -- newforms MultipleChoiceField now handles MultiValueDicts properly. Thanks for the patch, Honza Král

git-svn-id: http://code.djangoproject.com/svn/django/trunk@4196 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/newforms/forms.py

@@ -2,7 +2,7 @@
 Form classes
 """
 
-from django.utils.datastructures import SortedDict
+from django.utils.datastructures import SortedDict, MultiValueDict
 from django.utils.html import escape
 from fields import Field
 from widgets import TextInput, Textarea, HiddenInput
@@ -221,6 +221,8 @@ class BoundField(StrAndUnicode):
 
     def _data(self):
         "Returns the data for this BoundField, or None if it wasn't given."
+        if self.field.widget.requires_data_list and isinstance(self.form.data, MultiValueDict):
+            return self.form.data.getlist(self.name)
         return self.form.data.get(self.name, None)
     data = property(_data)
 

django/newforms/widgets.py

@@ -9,6 +9,7 @@ __all__ = (
 )
 
 from util import StrAndUnicode, smart_unicode
+from django.utils.datastructures import MultiValueDict
 from django.utils.html import escape
 from itertools import chain
 
@@ -64,6 +65,7 @@ class Input(Widget):
     type='radio', which are special).
     """
     input_type = None # Subclasses must define this.
+
     def render(self, name, value, attrs=None):
         if value is None: value = ''
         final_attrs = self.build_attrs(attrs, type=self.input_type, name=name)
@@ -146,6 +148,11 @@ class SelectMultiple(Widget):
         output.append(u'</select>')
         return u'\n'.join(output)
 
+    def value_from_datadict(self, data, name):
+        if isinstance(data, MultiValueDict):
+            return data.getlist(name)
+        return data.get(name, None)
+
 class RadioInput(StrAndUnicode):
     "An object used by RadioFieldRenderer that represents a single <input type='radio'>."
     def __init__(self, name, value, attrs, choice, index):

tests/regressiontests/forms/tests.py

@@ -1672,6 +1672,23 @@ MultipleChoiceField can also be used with the CheckboxSelectMultiple widget.
 <li><label><input checked="checked" type="checkbox" name="composers" value="P" /> Paul McCartney</label></li>
 </ul>
 
+Data for a MultipleChoiceField should be a list. QueryDict and MultiValueDict
+conveniently work with this.
+>>> data = {'name': 'Yesterday', 'composers': ['J', 'P']}
+>>> f = SongForm(data)
+>>> f.errors
+{}
+>>> from django.http import QueryDict
+>>> data = QueryDict('name=Yesterday&composers=J&composers=P')
+>>> f = SongForm(data)
+>>> f.errors
+{}
+>>> from django.utils.datastructures import MultiValueDict
+>>> data = MultiValueDict(dict(name='Yesterday', composers=['J', 'P']))
+>>> f = SongForm(data)
+>>> f.errors
+{}
+
 When using CheckboxSelectMultiple, the framework expects a list of input and
 returns a list of input.
 >>> f = SongForm({'name': 'Yesterday'}, auto_id=False)