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from django.template import Context, Engine
from django.test import SimpleTestCase
from ..utils import setup
class IfChangedTagTests(SimpleTestCase):
libraries = {'custom': 'template_tests.templatetags.custom'}
@setup({'ifchanged01': '{% for n in num %}{% ifchanged %}{{ n }}{% endifchanged %}{% endfor %}'})
def test_ifchanged01(self):
output = self.engine.render_to_string('ifchanged01', {'num': (1, 2, 3)})
self.assertEqual(output, '123')
@setup({'ifchanged02': '{% for n in num %}{% ifchanged %}{{ n }}{% endifchanged %}{% endfor %}'})
def test_ifchanged02(self):
output = self.engine.render_to_string('ifchanged02', {'num': (1, 1, 3)})
self.assertEqual(output, '13')
@setup({'ifchanged03': '{% for n in num %}{% ifchanged %}{{ n }}{% endifchanged %}{% endfor %}'})
def test_ifchanged03(self):
output = self.engine.render_to_string('ifchanged03', {'num': (1, 1, 1)})
self.assertEqual(output, '1')
@setup({'ifchanged04': '{% for n in num %}{% ifchanged %}{{ n }}{% endifchanged %}'
'{% for x in numx %}{% ifchanged %}{{ x }}{% endifchanged %}'
'{% endfor %}{% endfor %}'})
def test_ifchanged04(self):
output = self.engine.render_to_string('ifchanged04', {'num': (1, 2, 3), 'numx': (2, 2, 2)})
self.assertEqual(output, '122232')
@setup({'ifchanged05': '{% for n in num %}{% ifchanged %}{{ n }}{% endifchanged %}'
'{% for x in numx %}{% ifchanged %}{{ x }}{% endifchanged %}'
'{% endfor %}{% endfor %}'})
def test_ifchanged05(self):
output = self.engine.render_to_string('ifchanged05', {'num': (1, 1, 1), 'numx': (1, 2, 3)})
self.assertEqual(output, '1123123123')
@setup({'ifchanged06': '{% for n in num %}{% ifchanged %}{{ n }}{% endifchanged %}'
'{% for x in numx %}{% ifchanged %}{{ x }}{% endifchanged %}'
'{% endfor %}{% endfor %}'})
def test_ifchanged06(self):
output = self.engine.render_to_string('ifchanged06', {'num': (1, 1, 1), 'numx': (2, 2, 2)})
self.assertEqual(output, '1222')
@setup({'ifchanged07': '{% for n in num %}{% ifchanged %}{{ n }}{% endifchanged %}'
'{% for x in numx %}{% ifchanged %}{{ x }}{% endifchanged %}'
'{% for y in numy %}{% ifchanged %}{{ y }}{% endifchanged %}'
'{% endfor %}{% endfor %}{% endfor %}'})
def test_ifchanged07(self):
output = self.engine.render_to_string('ifchanged07', {'num': (1, 1, 1), 'numx': (2, 2, 2), 'numy': (3, 3, 3)})
self.assertEqual(output, '1233323332333')
@setup({'ifchanged08': '{% for data in datalist %}{% for c,d in data %}'
'{% if c %}{% ifchanged %}{{ d }}{% endifchanged %}'
'{% endif %}{% endfor %}{% endfor %}'})
def test_ifchanged08(self):
output = self.engine.render_to_string('ifchanged08', {'datalist': [
[(1, 'a'), (1, 'a'), (0, 'b'), (1, 'c')],
[(0, 'a'), (1, 'c'), (1, 'd'), (1, 'd'), (0, 'e')]
]})
self.assertEqual(output, 'accd')
@setup({'ifchanged-param01': '{% for n in num %}{% ifchanged n %}..{% endifchanged %}'
'{{ n }}{% endfor %}'})
def test_ifchanged_param01(self):
"""
Test one parameter given to ifchanged.
"""
output = self.engine.render_to_string('ifchanged-param01', {'num': (1, 2, 3)})
self.assertEqual(output, '..1..2..3')
@setup({'ifchanged-param02': '{% for n in num %}{% for x in numx %}{% ifchanged n %}..{% endifchanged %}'
'{{ x }}{% endfor %}{% endfor %}'})
def test_ifchanged_param02(self):
output = self.engine.render_to_string('ifchanged-param02', {'num': (1, 2, 3), 'numx': (5, 6, 7)})
self.assertEqual(output, '..567..567..567')
@setup({'ifchanged-param03': '{% for n in num %}{{ n }}{% for x in numx %}'
'{% ifchanged x n %}{{ x }}{% endifchanged %}'
'{% endfor %}{% endfor %}'})
def test_ifchanged_param03(self):
"""
Test multiple parameters to ifchanged.
"""
output = self.engine.render_to_string('ifchanged-param03', {'num': (1, 1, 2), 'numx': (5, 6, 6)})
self.assertEqual(output, '156156256')
@setup({'ifchanged-param04': '{% for d in days %}{% ifchanged %}{{ d.day }}{% endifchanged %}'
'{% for h in d.hours %}{% ifchanged d h %}{{ h }}{% endifchanged %}'
'{% endfor %}{% endfor %}'})
def test_ifchanged_param04(self):
"""
Test a date+hour like construct, where the hour of the last day is
the same but the date had changed, so print the hour anyway.
"""
output = self.engine.render_to_string(
'ifchanged-param04',
{'days': [{'hours': [1, 2, 3], 'day': 1}, {'hours': [3], 'day': 2}]},
)
self.assertEqual(output, '112323')
@setup({'ifchanged-param05': '{% for d in days %}{% ifchanged d.day %}{{ d.day }}{% endifchanged %}'
'{% for h in d.hours %}{% ifchanged d.day h %}{{ h }}{% endifchanged %}'
'{% endfor %}{% endfor %}'})
def test_ifchanged_param05(self):
"""
Logically the same as above, just written with explicit ifchanged
for the day.
"""
output = self.engine.render_to_string(
'ifchanged-param05',
{'days': [{'hours': [1, 2, 3], 'day': 1}, {'hours': [3], 'day': 2}]},
)
self.assertEqual(output, '112323')
@setup({'ifchanged-else01': '{% for id in ids %}{{ id }}'
'{% ifchanged id %}-first{% else %}-other{% endifchanged %}'
',{% endfor %}'})
def test_ifchanged_else01(self):
"""
Test the else clause of ifchanged.
"""
output = self.engine.render_to_string('ifchanged-else01', {'ids': [1, 1, 2, 2, 2, 3]})
self.assertEqual(output, '1-first,1-other,2-first,2-other,2-other,3-first,')
@setup({'ifchanged-else02': '{% for id in ids %}{{ id }}-'
'{% ifchanged id %}{% cycle "red" "blue" %}{% else %}grey{% endifchanged %}'
',{% endfor %}'})
def test_ifchanged_else02(self):
output = self.engine.render_to_string('ifchanged-else02', {'ids': [1, 1, 2, 2, 2, 3]})
self.assertEqual(output, '1-red,1-grey,2-blue,2-grey,2-grey,3-red,')
@setup({'ifchanged-else03': '{% for id in ids %}{{ id }}'
'{% ifchanged id %}-{% cycle "red" "blue" %}{% else %}{% endifchanged %}'
',{% endfor %}'})
def test_ifchanged_else03(self):
output = self.engine.render_to_string('ifchanged-else03', {'ids': [1, 1, 2, 2, 2, 3]})
self.assertEqual(output, '1-red,1,2-blue,2,2,3-red,')
@setup({'ifchanged-else04': '{% for id in ids %}'
'{% ifchanged %}***{{ id }}*{% else %}...{% endifchanged %}'
'{{ forloop.counter }}{% endfor %}'})
def test_ifchanged_else04(self):
output = self.engine.render_to_string('ifchanged-else04', {'ids': [1, 1, 2, 2, 2, 3, 4]})
self.assertEqual(output, '***1*1...2***2*3...4...5***3*6***4*7')
@setup({'ifchanged-filter-ws': '{% load custom %}{% for n in num %}'
'{% ifchanged n|noop:"x y" %}..{% endifchanged %}{{ n }}'
'{% endfor %}'})
def test_ifchanged_filter_ws(self):
"""
Test whitespace in filter arguments
"""
output = self.engine.render_to_string('ifchanged-filter-ws', {'num': (1, 2, 3)})
self.assertEqual(output, '..1..2..3')
class IfChangedTests(SimpleTestCase):
@classmethod
def setUpClass(cls):
cls.engine = Engine()
super().setUpClass()
def test_ifchanged_concurrency(self):
"""
#15849 -- ifchanged should be thread-safe.
"""
template = self.engine.from_string(
'[0{% for x in foo %},{% with var=get_value %}{% ifchanged %}'
'{{ var }}{% endifchanged %}{% endwith %}{% endfor %}]'
)
# Using generator to mimic concurrency.
# The generator is not passed to the 'for' loop, because it does a list(values)
# instead, call gen.next() in the template to control the generator.
def gen():
yield 1
yield 2
# Simulate that another thread is now rendering.
# When the IfChangeNode stores state at 'self' it stays at '3' and skip the last yielded value below.
iter2 = iter([1, 2, 3])
output2 = template.render(Context({'foo': range(3), 'get_value': lambda: next(iter2)}))
self.assertEqual(
output2, '[0,1,2,3]', 'Expected [0,1,2,3] in second parallel template, got {}'.format(output2)
)
yield 3
gen1 = gen()
output1 = template.render(Context({'foo': range(3), 'get_value': lambda: next(gen1)}))
self.assertEqual(output1, '[0,1,2,3]', 'Expected [0,1,2,3] in first template, got {}'.format(output1))
def test_ifchanged_render_once(self):
"""
#19890. The content of ifchanged template tag was rendered twice.
"""
template = self.engine.from_string('{% ifchanged %}{% cycle "1st time" "2nd time" %}{% endifchanged %}')
output = template.render(Context({}))
self.assertEqual(output, '1st time')
def test_include(self):
"""
#23516 -- This works as a regression test only if the cached loader
isn't used. Hence we don't use the @setup decorator.
"""
engine = Engine(loaders=[
('django.template.loaders.locmem.Loader', {
'template': '{% for x in vars %}{% include "include" %}{% endfor %}',
'include': '{% ifchanged %}{{ x }}{% endifchanged %}',
}),
])
output = engine.render_to_string('template', {'vars': [1, 1, 2, 2, 3, 3]})
self.assertEqual(output, "123")
def test_include_state(self):
"""Tests the node state for different IncludeNodes (#27974)."""
engine = Engine(loaders=[
('django.template.loaders.locmem.Loader', {
'template': '{% for x in vars %}{% include "include" %}{% include "include" %}{% endfor %}',
'include': '{% ifchanged %}{{ x }}{% endifchanged %}',
}),
])
output = engine.render_to_string('template', {'vars': [1, 1, 2, 2, 3, 3]})
self.assertEqual(output, '112233')
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