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Fixed #13408 -- Deprecated silent unpacking exception passing in for template tag. 

Thanks peterbe for the suggestion.
This commit is contained in:
e0ne 2013-09-13 18:11:48 +03:00 committed by Tim Graham
parent b9bfcd82f0
commit 2aaa045c61
4 changed files with 39 additions and 7 deletions
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19
django/template/defaulttags.py
View File

@ -17,6 +17,7 @@ from django.template.base import (Node, NodeList, Template, Context, Library,
render_value_in_context)
from django.template.smartif import IfParser, Literal
from django.template.defaultfilters import date
from django.utils.deprecation import RemovedInDjango20Warning
from django.utils.encoding import force_text, smart_text
from django.utils.safestring import mark_safe
from django.utils.html import format_html
@ -158,7 +159,8 @@ class ForNode(Node):
nodelist = []
if self.is_reversed:
values = reversed(values)
unpack = len(self.loopvars) > 1
num_loopvars = len(self.loopvars)
unpack = num_loopvars > 1
# Create a forloop value in the context. We'll update counters on each
# iteration just below.
loop_dict = context['forloop'] = {'parentloop': parentloop}
@ -177,6 +179,21 @@ class ForNode(Node):
if unpack:
# If there are multiple loop variables, unpack the item into
# them.
# To complete this deprecation, remove from here to the
# try/except block as well as the try/except itself,
# leaving `unpacked_vars = ...` and the "else" statements.
if not isinstance(item, (list, tuple)):
len_item = 1
else:
len_item = len(item)
# Check loop variable count before unpacking
if num_loopvars != len_item:
warnings.warn(
"Need {0} values to unpack in for loop; got {1}. "
"This will raise an exception in Django 2.0."
.format(num_loopvars, len_item),
RemovedInDjango20Warning)
try:
unpacked_vars = dict(zip(self.loopvars, item))
except TypeError:

3
docs/internals/deprecation.txt
View File

@ -22,6 +22,9 @@ about each item can often be found in the release notes of two versions prior.
* ``SimpleTestCase.urls`` will be removed.
* Using an incorrect count of unpacked values in the ``for`` template tag
will raise an exception rather than fail silently.
.. _deprecation-removed-in-1.9:
1.9

6
docs/releases/1.8.txt
View File

@ -270,3 +270,9 @@ removed in Django 2.0. Use :func:`@override_settings(ROOT_URLCONF=...)
Related to the previous item, the ``prefix`` argument to
:func:`django.conf.urls.i18n.i18n_patterns` has been deprecated. Simply pass a
list of :func:`django.conf.urls.url` instances instead.
Using an incorrect count of unpacked values in the :ttag:`for` template tag
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Using an incorrect count of unpacked values in :ttag:`for` tag will raise an
exception rather than fail silently in Django 2.0.

18
tests/template_tests/tests.py
View File

@ -602,7 +602,10 @@ class TemplateTests(TestCase):
failures.append("Template test (Cached='%s', TEMPLATE_STRING_IF_INVALID='%s', TEMPLATE_DEBUG=%s): %s -- FAILED. Template loading invoked method that shouldn't have been invoked." % (is_cached, invalid_str, template_debug, name))
try:
output = self.render(test_template, vals)
with warnings.catch_warnings():
# Ignore deprecations of using the wrong number of variables with the 'for' tag.
warnings.filterwarnings("ignore", category=RemovedInDjango20Warning, module="django.template.defaulttags")
output = self.render(test_template, vals)
except ShouldNotExecuteException:
failures.append("Template test (Cached='%s', TEMPLATE_STRING_IF_INVALID='%s', TEMPLATE_DEBUG=%s): %s -- FAILED. Template rendering invoked method that shouldn't have been invoked." % (is_cached, invalid_str, template_debug, name))
except ContextStackException:
@ -954,18 +957,21 @@ class TemplateTests(TestCase):
'for-tag-unpack08': ("{% for key,value, in items %}{{ key }}:{{ value }}/{% endfor %}", {"items": (('one', 1), ('two', 2))}, template.TemplateSyntaxError),
# Ensure that a single loopvar doesn't truncate the list in val.
'for-tag-unpack09': ("{% for val in items %}{{ val.0 }}:{{ val.1 }}/{% endfor %}", {"items": (('one', 1), ('two', 2))}, "one:1/two:2/"),
# Otherwise, silently truncate if the length of loopvars differs to the length of each set of items.
'for-tag-unpack10': ("{% for x,y in items %}{{ x }}:{{ y }}/{% endfor %}", {"items": (('one', 1, 'carrot'), ('two', 2, 'orange'))}, "one:1/two:2/"),
'for-tag-unpack11': ("{% for x,y,z in items %}{{ x }}:{{ y }},{{ z }}/{% endfor %}", {"items": (('one', 1), ('two', 2))}, ("one:1,/two:2,/", "one:1,INVALID/two:2,INVALID/")),
'for-tag-unpack12': ("{% for x,y,z in items %}{{ x }}:{{ y }},{{ z }}/{% endfor %}", {"items": (('one', 1, 'carrot'), ('two', 2))}, ("one:1,carrot/two:2,/", "one:1,carrot/two:2,INVALID/")),
'for-tag-unpack13': ("{% for x,y,z in items %}{{ x }}:{{ y }},{{ z }}/{% endfor %}", {"items": (('one', 1, 'carrot'), ('two', 2, 'cheese'))}, ("one:1,carrot/two:2,cheese/", "one:1,carrot/two:2,cheese/")),
'for-tag-unpack14': ("{% for x,y in items %}{{ x }}:{{ y }}/{% endfor %}", {"items": (1, 2)}, (":/:/", "INVALID:INVALID/INVALID:INVALID/")),
'for-tag-empty01': ("{% for val in values %}{{ val }}{% empty %}empty text{% endfor %}", {"values": [1, 2, 3]}, "123"),
'for-tag-empty02': ("{% for val in values %}{{ val }}{% empty %}values array empty{% endfor %}", {"values": []}, "values array empty"),
'for-tag-empty03': ("{% for val in values %}{{ val }}{% empty %}values array not found{% endfor %}", {}, "values array not found"),
# Ticket 19882
'for-tag-filter-ws': ("{% load custom %}{% for x in s|noop:'x y' %}{{ x }}{% endfor %}", {'s': 'abc'}, 'abc'),
# These tests raise deprecation warnings and will raise an exception
# in Django 2.0. The existing behavior is silent truncation if the
# length of loopvars differs to the length of each set of items.
'for-tag-unpack10': ("{% for x,y in items %}{{ x }}:{{ y }}/{% endfor %}", {"items": (('one', 1, 'carrot'), ('two', 2, 'orange'))}, "one:1/two:2/"),
'for-tag-unpack11': ("{% for x,y,z in items %}{{ x }}:{{ y }},{{ z }}/{% endfor %}", {"items": (('one', 1), ('two', 2))}, ("one:1,/two:2,/", "one:1,INVALID/two:2,INVALID/")),
'for-tag-unpack12': ("{% for x,y,z in items %}{{ x }}:{{ y }},{{ z }}/{% endfor %}", {"items": (('one', 1, 'carrot'), ('two', 2))}, ("one:1,carrot/two:2,/", "one:1,carrot/two:2,INVALID/")),
'for-tag-unpack14': ("{% for x,y in items %}{{ x }}:{{ y }}/{% endfor %}", {"items": (1, 2)}, (":/:/", "INVALID:INVALID/INVALID:INVALID/")),
### IF TAG ################################################################
'if-tag01': ("{% if foo %}yes{% else %}no{% endif %}", {"foo": True}, "yes"),
'if-tag02': ("{% if foo %}yes{% else %}no{% endif %}", {"foo": False}, "no"),