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Mention that people subscribe with **extra.

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commit 174f32250ec54950badbaf3878d9d6acc8328ddd 1 parent 230e136
@mitsuhiko authored
Showing with 4 additions and 1 deletion.
  1. +4 −1 docs/signals.rst
5 docs/signals.rst
@@ -55,7 +55,7 @@ to the template::
def captured_templates(app):
recorded = []
- def record(sender, template, context):
+ def record(sender, template, context, **extra):
recorded.append((template, context))
template_rendered.connect(record, app)
@@ -73,6 +73,9 @@ This can now easily be paired with a test client::
assert == 'index.html'
assert len(context['items']) == 10
+Make sure to subscribe with an extra ``**extra`` argument so that your
+calls don't fail if Flask introduces new arguments to the signals.
All the template rendering in the code issued by the application `app`
in the body of the `with` block will now be recorded in the `templates`
variable. Whenever a template is rendered, the template object as well as
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