#33864: Deprecate length_is template filter in favor of length.
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Reporter: Nick Pope | Owner: Nick Pope
Type: | Status: assigned
Cleanup/optimization |
Component: Template | Version: dev
system | Keywords: length_is, length,
Severity: Normal | template, filter
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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The `length_is` template filter is a vestige from the days of the `{%
ifequal %}` and `{% ifnotequal %}` days before `{% if %}` arrived with
support for comparison with operators. Even the example in the
documentation (see
[https://docs.djangoproject.com/en/4.0/ref/templates/builtins/#length-is
here]) is poor: `{{ value|length_is:"4" }}` will only return one of three
possible values - `True`, `False`, or `""`, the empty string being for
errors in the provided values.
It seems to me that it would be better to encourage use of the `length`
template filter with the `{% if %}` template tag which can provide more
flexibility:
{{{#!django
{# Before: #}
{% if value|length_is:"4" %}...{% endif %}
{{ value|length_is:"4" }} ← This is of dubious use given the restricted
set of possible output values.
{# After: #}
{% if value|length == 4 %}...{% endif %}
{% if value|length == 4 %}True{% else %}False{% endif %} ← Much clearer
but also allows customising the output values.
}}}
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Ticket URL: <https://code.djangoproject.com/ticket/33864>
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