mirror of https://github.com/django/django.git
123 lines
4.0 KiB
Python
123 lines
4.0 KiB
Python
from __future__ import unicode_literals
|
|
|
|
from unittest import TestCase
|
|
|
|
from django import template
|
|
|
|
|
|
class CallableVariablesTests(TestCase):
|
|
|
|
def test_callable(self):
|
|
|
|
class Doodad(object):
|
|
def __init__(self, value):
|
|
self.num_calls = 0
|
|
self.value = value
|
|
|
|
def __call__(self):
|
|
self.num_calls += 1
|
|
return {"the_value": self.value}
|
|
|
|
my_doodad = Doodad(42)
|
|
c = template.Context({"my_doodad": my_doodad})
|
|
|
|
# We can't access ``my_doodad.value`` in the template, because
|
|
# ``my_doodad.__call__`` will be invoked first, yielding a dictionary
|
|
# without a key ``value``.
|
|
t = template.Template('{{ my_doodad.value }}')
|
|
self.assertEqual(t.render(c), '')
|
|
|
|
# We can confirm that the doodad has been called
|
|
self.assertEqual(my_doodad.num_calls, 1)
|
|
|
|
# But we can access keys on the dict that's returned
|
|
# by ``__call__``, instead.
|
|
t = template.Template('{{ my_doodad.the_value }}')
|
|
self.assertEqual(t.render(c), '42')
|
|
self.assertEqual(my_doodad.num_calls, 2)
|
|
|
|
def test_alters_data(self):
|
|
|
|
class Doodad(object):
|
|
alters_data = True
|
|
|
|
def __init__(self, value):
|
|
self.num_calls = 0
|
|
self.value = value
|
|
|
|
def __call__(self):
|
|
self.num_calls += 1
|
|
return {"the_value": self.value}
|
|
|
|
my_doodad = Doodad(42)
|
|
c = template.Context({"my_doodad": my_doodad})
|
|
|
|
# Since ``my_doodad.alters_data`` is True, the template system will not
|
|
# try to call our doodad but will use TEMPLATE_STRING_IF_INVALID
|
|
t = template.Template('{{ my_doodad.value }}')
|
|
self.assertEqual(t.render(c), '')
|
|
t = template.Template('{{ my_doodad.the_value }}')
|
|
self.assertEqual(t.render(c), '')
|
|
|
|
# Double-check that the object was really never called during the
|
|
# template rendering.
|
|
self.assertEqual(my_doodad.num_calls, 0)
|
|
|
|
def test_do_not_call(self):
|
|
|
|
class Doodad(object):
|
|
do_not_call_in_templates = True
|
|
|
|
def __init__(self, value):
|
|
self.num_calls = 0
|
|
self.value = value
|
|
|
|
def __call__(self):
|
|
self.num_calls += 1
|
|
return {"the_value": self.value}
|
|
|
|
my_doodad = Doodad(42)
|
|
c = template.Context({"my_doodad": my_doodad})
|
|
|
|
# Since ``my_doodad.do_not_call_in_templates`` is True, the template
|
|
# system will not try to call our doodad. We can access its attributes
|
|
# as normal, and we don't have access to the dict that it returns when
|
|
# called.
|
|
t = template.Template('{{ my_doodad.value }}')
|
|
self.assertEqual(t.render(c), '42')
|
|
t = template.Template('{{ my_doodad.the_value }}')
|
|
self.assertEqual(t.render(c), '')
|
|
|
|
# Double-check that the object was really never called during the
|
|
# template rendering.
|
|
self.assertEqual(my_doodad.num_calls, 0)
|
|
|
|
def test_do_not_call_and_alters_data(self):
|
|
# If we combine ``alters_data`` and ``do_not_call_in_templates``, the
|
|
# ``alters_data`` attribute will not make any difference in the
|
|
# template system's behavior.
|
|
|
|
class Doodad(object):
|
|
do_not_call_in_templates = True
|
|
alters_data = True
|
|
|
|
def __init__(self, value):
|
|
self.num_calls = 0
|
|
self.value = value
|
|
|
|
def __call__(self):
|
|
self.num_calls += 1
|
|
return {"the_value": self.value}
|
|
|
|
my_doodad = Doodad(42)
|
|
c = template.Context({"my_doodad": my_doodad})
|
|
|
|
t = template.Template('{{ my_doodad.value }}')
|
|
self.assertEqual(t.render(c), '42')
|
|
t = template.Template('{{ my_doodad.the_value }}')
|
|
self.assertEqual(t.render(c), '')
|
|
|
|
# Double-check that the object was really never called during the
|
|
# template rendering.
|
|
self.assertEqual(my_doodad.num_calls, 0)
|