Fixed #9587. Formset.is_valid() now returns True if an invalid form is marked for deletion. Thanks for the test and intial patch, kratorius.

Note that this leaves the form and formset errors alone. Those forms still have errors, it's just that it doesn't matter that they're invalid in the context of the formset and deletion.
Also fixed #9665 while I was in there. Thanks, mark_hildreth.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@10206 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/forms/formsets.py

@@ -4,7 +4,7 @@ from django.utils.safestring import mark_safe
 from django.utils.translation import ugettext as _
 from fields import IntegerField, BooleanField
 from widgets import Media, HiddenInput
-from util import ErrorList, ValidationError
+from util import ErrorList, ErrorDict, ValidationError
 
 __all__ = ('BaseFormSet', 'all_valid')
 
@@ -152,7 +152,7 @@ class BaseFormSet(StrAndUnicode):
     def _get_ordered_forms(self):
         """
         Returns a list of form in the order specified by the incoming data.
-        Raises an AttributeError if deletion is not allowed.
+        Raises an AttributeError if ordering is not allowed.
         """
         if not self.is_valid() or not self.can_order:
             raise AttributeError("'%s' object has no attribute 'ordered_forms'" % self.__class__.__name__)
@@ -221,8 +221,21 @@ class BaseFormSet(StrAndUnicode):
         # We loop over every form.errors here rather than short circuiting on the
         # first failure to make sure validation gets triggered for every form.
         forms_valid = True
-        for errors in self.errors:
+        for i in range(0, self.total_form_count()):
-            if bool(errors):
+            form = self.forms[i]
+            if self.can_delete:
+                # The way we lookup the value of the deletion field here takes
+                # more code than we'd like, but the form's cleaned_data will
+                # not exist if the form is invalid.
+                field = form.fields[DELETION_FIELD_NAME]
+                prefix = form.add_prefix(DELETION_FIELD_NAME)
+                value = field.widget.value_from_datadict(self.data, self.files, prefix)
+                should_delete = field.clean(value)
+                if should_delete:
+                    # This form is going to be deleted so any of its errors
+                    # should not cause the entire formset to be invalid.
+                    continue
+            if bool(self.errors[i]):
                 forms_valid = False
         return forms_valid and not bool(self.non_form_errors())
 

tests/regressiontests/forms/formsets.py

@@ -241,7 +241,7 @@ data.
 
 # FormSets with deletion ######################################################
 
-We can easily add deletion ability to a FormSet with an agrument to
+We can easily add deletion ability to a FormSet with an argument to
 formset_factory. This will add a boolean field to each form instance. When
 that boolean field is True, the form will be in formset.deleted_forms
 
@@ -286,6 +286,34 @@ True
 >>> [form.cleaned_data for form in formset.deleted_forms]
 [{'votes': 900, 'DELETE': True, 'choice': u'Fergie'}]
 
+If we fill a form with something and then we check the can_delete checkbox for
+that form, that form's errors should not make the entire formset invalid since
+it's going to be deleted.
+
+>>> class CheckForm(Form):
+...    field = IntegerField(min_value=100)
+
+>>> data = {
+...     'check-TOTAL_FORMS': '3', # the number of forms rendered
+...     'check-INITIAL_FORMS': '2', # the number of forms with initial data
+...     'check-0-field': '200',
+...     'check-0-DELETE': '',
+...     'check-1-field': '50',
+...     'check-1-DELETE': 'on',
+...     'check-2-field': '',
+...     'check-2-DELETE': '',
+... }
+>>> CheckFormSet = formset_factory(CheckForm, can_delete=True)
+>>> formset = CheckFormSet(data, prefix='check')
+>>> formset.is_valid()
+True
+
+If we remove the deletion flag now we will have our validation back.
+
+>>> data['check-1-DELETE'] = ''
+>>> formset = CheckFormSet(data, prefix='check')
+>>> formset.is_valid()
+False
 
 # FormSets with ordering ######################################################