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Code Issues 32 Releases Wiki Activity

Fixed #36186 -- Added forloop.length variable within a template for loop.

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This commit is contained in:
Jonathan Ströbele 2025-02-13 16:23:29 +01:00 committed by Sarah Boyce
parent 582ba18d56
commit 240421c7c4
4 changed files with 30 additions and 2 deletions
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5
django/template/defaulttags.py
View File

@ -206,7 +206,10 @@ class ForNode(Node):
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}
loop_dict = context["forloop"] = {
"parentloop": parentloop,
"length": len_values,
}
for i, item in enumerate(values):
# Shortcuts for current loop iteration number.
loop_dict["counter0"] = i

5
docs/ref/templates/builtins.txt
View File

@ -423,10 +423,15 @@ Variable Description
loop (0-indexed)
``forloop.first`` True if this is the first time through the loop
``forloop.last`` True if this is the last time through the loop
``forloop.length`` The length of the loop
``forloop.parentloop`` For nested loops, this is the loop surrounding
the current one
========================== ===============================================
.. versionchanged:: 6.0
The variable ``forloop.length`` was added.
``for`` ... ``empty``
---------------------

3
docs/releases/6.0.txt
View File

@ -207,7 +207,8 @@ Signals
Templates
~~~~~~~~~
* ...
* The new variable ``forloop.length`` is now available within a :ttag:`for`
loop.
Tests
~~~~~

19
tests/template_tests/syntax_tests/test_for.py
View File

@ -356,6 +356,25 @@ class ForTagTests(SimpleTestCase):
with self.assertRaisesMessage(TemplateSyntaxError, msg):
self.engine.render_to_string("invalid_for_loop", {"items": (1, 2)})
@setup(
{
"forloop-length": "{% for val in values %}{{ forloop.length }}{% endfor %}",
"forloop-length-reversed": "{% for val in values reversed %}"
"{{ forloop.length }}{% endfor %}",
}
)
def test_forloop_length(self):
cases = [
([1, 2, 3], "333"),
([1, 2, 3, 4, 5, 6], "666666"),
([], ""),
]
for values, expected_output in cases:
for template in ["forloop-length", "forloop-length-reversed"]:
with self.subTest(expected_output=expected_output, template=template):
output = self.engine.render_to_string(template, {"values": values})
self.assertEqual(output, expected_output)
class ForNodeTests(SimpleTestCase):
def test_repr(self):