Django Duplicate Blocks
ID |
python.django_duplicate_blocks |
Severity |
low |
Remediation Complexity |
trivial |
Remediation Risk |
low |
Remediation Effort |
low |
Resource |
Reliability |
Language |
Python |
Tags |
framework-django, reliability, template |
Description
Reports two {% block X %} tags with the same name in the same template. Django raises TemplateSyntaxError: 'block' tag with name 'X' appears more than once — but only when the template is actually rendered, so the bug typically slips through review and bites in production.
{% block content %} ... {% endblock %}
{% block content %} ... {% endblock %} <!-- FLAW -->Rationale
The duplicate is a render-time error, not a parse-time one — so the template ships, passes any "the file exists" smoke test, and only crashes once the real view tries to render it.