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import os
from django.template import Context, Engine, TemplateDoesNotExist
from django.template.loader_tags import ExtendsError
from django.template.loaders.base import Loader
from django.test import SimpleTestCase, ignore_warnings
from django.utils.deprecation import RemovedInDjango20Warning
from .utils import ROOT
RECURSIVE = os.path.join(ROOT, 'recursive_templates')
class ExtendsBehaviorTests(SimpleTestCase):
def test_normal_extend(self):
engine = Engine(dirs=[os.path.join(RECURSIVE, 'fs')])
template = engine.get_template('one.html')
output = template.render(Context({}))
self.assertEqual(output.strip(), 'three two one')
def test_extend_recursive(self):
engine = Engine(dirs=[
os.path.join(RECURSIVE, 'fs'),
os.path.join(RECURSIVE, 'fs2'),
os.path.join(RECURSIVE, 'fs3'),
])
template = engine.get_template('recursive.html')
output = template.render(Context({}))
self.assertEqual(output.strip(), 'fs3/recursive fs2/recursive fs/recursive')
def test_extend_missing(self):
engine = Engine(dirs=[os.path.join(RECURSIVE, 'fs')])
template = engine.get_template('extend-missing.html')
with self.assertRaises(TemplateDoesNotExist) as e:
template.render(Context({}))
tried = e.exception.tried
self.assertEqual(len(tried), 1)
self.assertEqual(tried[0][0].template_name, 'missing.html')
def test_recursive_multiple_loaders(self):
engine = Engine(
dirs=[os.path.join(RECURSIVE, 'fs')],
loaders=[(
'django.template.loaders.locmem.Loader', {
'one.html': (
'{% extends "one.html" %}{% block content %}{{ block.super }} locmem-one{% endblock %}'
),
'two.html': (
'{% extends "two.html" %}{% block content %}{{ block.super }} locmem-two{% endblock %}'
),
'three.html': (
'{% extends "three.html" %}{% block content %}{{ block.super }} locmem-three{% endblock %}'
),
}
), 'django.template.loaders.filesystem.Loader'],
)
template = engine.get_template('one.html')
output = template.render(Context({}))
self.assertEqual(output.strip(), 'three locmem-three two locmem-two one locmem-one')
def test_extend_self_error(self):
"""
Catch if a template extends itself and no other matching
templates are found.
"""
engine = Engine(dirs=[os.path.join(RECURSIVE, 'fs')])
template = engine.get_template('self.html')
with self.assertRaises(TemplateDoesNotExist):
template.render(Context({}))
def test_extend_cached(self):
engine = Engine(
dirs=[
os.path.join(RECURSIVE, 'fs'),
os.path.join(RECURSIVE, 'fs2'),
os.path.join(RECURSIVE, 'fs3'),
],
loaders=[
('django.template.loaders.cached.Loader', [
'django.template.loaders.filesystem.Loader',
]),
],
)
template = engine.get_template('recursive.html')
output = template.render(Context({}))
self.assertEqual(output.strip(), 'fs3/recursive fs2/recursive fs/recursive')
cache = engine.template_loaders[0].get_template_cache
self.assertEqual(len(cache), 3)
expected_path = os.path.join('fs', 'recursive.html')
self.assertTrue(cache['recursive.html'].origin.name.endswith(expected_path))
# Render another path that uses the same templates from the cache
template = engine.get_template('other-recursive.html')
output = template.render(Context({}))
self.assertEqual(output.strip(), 'fs3/recursive fs2/recursive fs/recursive')
# Template objects should not be duplicated.
self.assertEqual(len(cache), 4)
expected_path = os.path.join('fs', 'other-recursive.html')
self.assertTrue(cache['other-recursive.html'].origin.name.endswith(expected_path))
def test_unique_history_per_loader(self):
"""
Extending should continue even if two loaders return the same
name for a template.
"""
engine = Engine(
loaders=[
['django.template.loaders.locmem.Loader', {
'base.html': '{% extends "base.html" %}{% block content %}{{ block.super }} loader1{% endblock %}',
}],
['django.template.loaders.locmem.Loader', {
'base.html': '{% block content %}loader2{% endblock %}',
}],
]
)
template = engine.get_template('base.html')
output = template.render(Context({}))
self.assertEqual(output.strip(), 'loader2 loader1')
class NonRecursiveLoader(Loader):
def __init__(self, engine, templates_dict):
self.templates_dict = templates_dict
super(NonRecursiveLoader, self).__init__(engine)
def load_template_source(self, template_name, template_dirs=None):
try:
return self.templates_dict[template_name], template_name
except KeyError:
raise TemplateDoesNotExist(template_name)
@ignore_warnings(category=RemovedInDjango20Warning)
class NonRecursiveLoaderExtendsTests(SimpleTestCase):
loaders = [
('template_tests.test_extends.NonRecursiveLoader', {
'base.html': 'base',
'index.html': '{% extends "base.html" %}',
'recursive.html': '{% extends "recursive.html" %}',
'other-recursive.html': '{% extends "recursive.html" %}',
'a.html': '{% extends "b.html" %}',
'b.html': '{% extends "a.html" %}',
}),
]
def test_extend(self):
engine = Engine(loaders=self.loaders)
output = engine.render_to_string('index.html')
self.assertEqual(output, 'base')
def test_extend_cached(self):
engine = Engine(loaders=[
('django.template.loaders.cached.Loader', self.loaders),
])
output = engine.render_to_string('index.html')
self.assertEqual(output, 'base')
cache = engine.template_loaders[0].template_cache
self.assertIn('base.html', cache)
self.assertIn('index.html', cache)
# Render a second time from cache
output = engine.render_to_string('index.html')
self.assertEqual(output, 'base')
def test_extend_error(self):
engine = Engine(loaders=self.loaders)
msg = 'Cannot extend templates recursively when using non-recursive template loaders'
with self.assertRaisesMessage(ExtendsError, msg):
engine.render_to_string('recursive.html')
with self.assertRaisesMessage(ExtendsError, msg):
engine.render_to_string('other-recursive.html')
with self.assertRaisesMessage(ExtendsError, msg):
engine.render_to_string('a.html')
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