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Warn plugin authors to avoid name conflicts with extra_template_vars

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Closes #1988
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Simon Willison 2026-06-23 12:46:15 -07:00
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docs/plugin_hooks.rst
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@ -230,6 +230,10 @@ Function that returns an awaitable function that returns a dictionary
Datasette runs Jinja2 in `async mode <https://jinja.palletsprojects.com/en/2.10.x/api/#async-support>`__, which means you can add awaitable functions to the template scope and they will be automatically awaited when they are rendered by the template.
.. warning::
Be careful not to accidentally define a variable that conflicts with one that Datasette is already using for something else. Check :ref:`the template context documentation <template_context>` to see the variables defined by Datasette core.
Here's an example plugin that adds a ``"user_agent"`` variable to the template context containing the current request's User-Agent header:
.. code-block:: python