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Fixed #10134 -- Added unique_for_[date|day|month|year] validation to ModelForm handling. Thanks to Alex Gaynor for the patch. 

git-svn-id: http://code.djangoproject.com/svn/django/trunk@10646 bcc190cf-cafb-0310-a4f2-bffc1f526a37
This commit is contained in:
Russell Keith-Magee 2009-04-30 13:47:39 +00:00
parent 2ba9df2f41
commit 17958fa7a9
2 changed files with 135 additions and 29 deletions
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117
django/forms/models.py
View File

@ -225,6 +225,7 @@ class BaseModelForm(BaseForm):
object_data.update(initial)
super(BaseModelForm, self).__init__(data, files, auto_id, prefix, object_data,
error_class, label_suffix, empty_permitted)
def clean(self):
self.validate_unique()
return self.cleaned_data
@ -239,16 +240,16 @@ class BaseModelForm(BaseForm):
# not make sense to check data that didn't validate, and since NULL does not
# equal NULL in SQL we should not do any unique checking for NULL values.
unique_checks = []
# these are checks for the unique_for_<date/year/month>
date_checks = []
for check in self.instance._meta.unique_together[:]:
fields_on_form = [field for field in check if self.cleaned_data.get(field) is not None]
if len(fields_on_form) == len(check):
unique_checks.append(check)
form_errors = []
# Gather a list of checks for fields declared as unique and add them to
# the list of checks. Again, skip empty fields and any that did not validate.
for name, field in self.fields.items():
for name in self.fields:
try:
f = self.instance._meta.get_field_by_name(name)[0]
except FieldDoesNotExist:
@ -260,10 +261,39 @@ class BaseModelForm(BaseForm):
# get_field_by_name found it, but it is not a Field so do not proceed
# to use it as if it were.
continue
if f.unique and self.cleaned_data.get(name) is not None:
if self.cleaned_data.get(name) is None:
continue
if f.unique:
unique_checks.append((name,))
if f.unique_for_date and self.cleaned_data.get(f.unique_for_date) is not None:
date_checks.append(('date', name, f.unique_for_date))
if f.unique_for_year and self.cleaned_data.get(f.unique_for_year) is not None:
date_checks.append(('year', name, f.unique_for_year))
if f.unique_for_month and self.cleaned_data.get(f.unique_for_month) is not None:
date_checks.append(('month', name, f.unique_for_month))
form_errors = []
bad_fields = set()
field_errors, global_errors = self._perform_unique_checks(unique_checks)
bad_fields.union(field_errors)
form_errors.extend(global_errors)
field_errors, global_errors = self._perform_date_checks(date_checks)
bad_fields.union(field_errors)
form_errors.extend(global_errors)
for field_name in bad_fields:
del self.cleaned_data[field_name]
if form_errors:
# Raise the unique together errors since they are considered
# form-wide.
raise ValidationError(form_errors)
def _perform_unique_checks(self, unique_checks):
bad_fields = set()
form_errors = []
for unique_check in unique_checks:
# Try to look up an existing object with the same values as this
# object's values for all the unique field.
@ -288,6 +318,55 @@ class BaseModelForm(BaseForm):
# This cute trick with extra/values is the most efficient way to
# tell if a particular query returns any results.
if qs.extra(select={'a': 1}).values('a').order_by():
if len(unique_check) == 1:
self._errors[unique_check[0]] = ErrorList([self.unique_error_message(unique_check)])
else:
form_errors.append(self.unique_error_message(unique_check))
# Mark these fields as needing to be removed from cleaned data
# later.
for field_name in unique_check:
bad_fields.add(field_name)
return bad_fields, form_errors
def _perform_date_checks(self, date_checks):
bad_fields = set()
for lookup_type, field, unique_for in date_checks:
lookup_kwargs = {}
# there's a ticket to add a date lookup, we can remove this special
# case if that makes it's way in
if lookup_type == 'date':
date = self.cleaned_data[unique_for]
lookup_kwargs['%s__day' % unique_for] = date.day
lookup_kwargs['%s__month' % unique_for] = date.month
lookup_kwargs['%s__year' % unique_for] = date.year
else:
lookup_kwargs['%s__%s' % (unique_for, lookup_type)] = getattr(self.cleaned_data[unique_for], lookup_type)
lookup_kwargs[field] = self.cleaned_data[field]
qs = self.instance.__class__._default_manager.filter(**lookup_kwargs)
# Exclude the current object from the query if we are editing an
# instance (as opposed to creating a new one)
if self.instance.pk is not None:
qs = qs.exclude(pk=self.instance.pk)
# This cute trick with extra/values is the most efficient way to
# tell if a particular query returns any results.
if qs.extra(select={'a': 1}).values('a').order_by():
self._errors[field] = ErrorList([
self.date_error_message(lookup_type, field, unique_for)
])
bad_fields.add(field)
return bad_fields, []
def date_error_message(self, lookup_type, field, unique_for):
return _(u"%(field_name)s must be unique for %(date_field)s %(lookup)s.") % {
'field_name': unicode(self.fields[field].label),
'date_field': unicode(self.fields[unique_for].label),
'lookup': lookup_type,
}
def unique_error_message(self, unique_check):
model_name = capfirst(self.instance._meta.verbose_name)
# A unique field
@ -295,32 +374,18 @@ class BaseModelForm(BaseForm):
field_name = unique_check[0]
field_label = self.fields[field_name].label
# Insert the error into the error dict, very sneaky
self._errors[field_name] = ErrorList([
_(u"%(model_name)s with this %(field_label)s already exists.") % \
{'model_name': unicode(model_name),
'field_label': unicode(field_label)}
])
return _(u"%(model_name)s with this %(field_label)s already exists.") % {
'model_name': unicode(model_name),
'field_label': unicode(field_label)
}
# unique_together
else:
field_labels = [self.fields[field_name].label for field_name in unique_check]
field_labels = get_text_list(field_labels, _('and'))
form_errors.append(
_(u"%(model_name)s with this %(field_label)s already exists.") % \
{'model_name': unicode(model_name),
'field_label': unicode(field_labels)}
)
# Mark these fields as needing to be removed from cleaned data
# later.
for field_name in unique_check:
bad_fields.add(field_name)
for field_name in bad_fields:
del self.cleaned_data[field_name]
if form_errors:
# Raise the unique together errors since they are considered
# form-wide.
raise ValidationError(form_errors)
return _(u"%(model_name)s with this %(field_label)s already exists.") % {
'model_name': unicode(model_name),
'field_label': unicode(field_labels)
}
def save(self, commit=True):
"""

41
tests/modeltests/model_forms/models.py
View File

@ -189,6 +189,15 @@ class ExplicitPK(models.Model):
def __unicode__(self):
return self.key
class Post(models.Model):
title = models.CharField(max_length=50, unique_for_date='posted', blank=True)
slug = models.CharField(max_length=50, unique_for_year='posted', blank=True)
subtitle = models.CharField(max_length=50, unique_for_month='posted', blank=True)
posted = models.DateField()
def __unicode__(self):
return self.name
__test__ = {'API_TESTS': """
>>> from django import forms
>>> from django.forms.models import ModelForm, model_to_dict
@ -1472,6 +1481,38 @@ ValidationError: [u'Select a valid choice. z is not one of the available choices
<tr><th><label for="id_description">Description:</label></th><td><input type="text" name="description" id="id_description" /></td></tr>
<tr><th><label for="id_url">The URL:</label></th><td><input id="id_url" type="text" name="url" maxlength="40" /></td></tr>
### Validation on unique_for_date
>>> p = Post.objects.create(title="Django 1.0 is released", slug="Django 1.0", subtitle="Finally", posted=datetime.date(2008, 9, 3))
>>> class PostForm(ModelForm):
... class Meta:
... model = Post
>>> f = PostForm({'title': "Django 1.0 is released", 'posted': '2008-09-03'})
>>> f.is_valid()
False
>>> f.errors
{'title': [u'Title must be unique for Posted date.']}
>>> f = PostForm({'title': "Work on Django 1.1 begins", 'posted': '2008-09-03'})
>>> f.is_valid()
True
>>> f = PostForm({'title': "Django 1.0 is released", 'posted': '2008-09-04'})
>>> f.is_valid()
True
>>> f = PostForm({'slug': "Django 1.0", 'posted': '2008-01-01'})
>>> f.is_valid()
False
>>> f.errors
{'slug': [u'Slug must be unique for Posted year.']}
>>> f = PostForm({'subtitle': "Finally", 'posted': '2008-09-30'})
>>> f.is_valid()
False
>>> f.errors
{'subtitle': [u'Subtitle must be unique for Posted month.']}
>>> f = PostForm({'subtitle': "Finally", "title": "Django 1.0 is released", "slug": "Django 1.0", 'posted': '2008-09-03'}, instance=p)
>>> f.is_valid()
True
# Clean up
>>> import shutil
>>> shutil.rmtree(temp_storage_dir)