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Allow extra_template_vars to resolve to None

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Closes #2005
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Simon Willison 2026-09-16 10:30:11 -07:00 • committed by GitHub
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7
docs/plugin_hooks.rst
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@ -217,7 +217,7 @@ Extra template variables that should be made available in the rendered template
``datasette`` - :ref:`internals_datasette`
You can use this to access plugin configuration options via ``datasette.plugin_config(your_plugin_name)``
This hook can return one of three different types:
This hook supports the following return values:
Dictionary
If you return a dictionary its keys and values will be merged into the template context.
@ -228,6 +228,9 @@ Function that returns a dictionary
Function that returns an awaitable function that returns a dictionary
You can also return a function which returns an awaitable function which returns a dictionary.
``None``
The hook itself, or a function or awaitable it returns, can return ``None`` when no extra variables are needed. Variables returned by other plugins are still included.
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::
@ -254,8 +257,6 @@ This example returns an awaitable function which adds a list of ``hidden_table_n
return {
"hidden_table_names": await db.hidden_table_names()
}
else:
return {}
return hidden_table_names