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(IfChangedTests, cls).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', dict(vars=[1, 1, 2, 2, 3, 3])) self.assertEqual(output, "123")