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Adding warning about non-service arguments for controllers #8558

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Oct 29, 2017
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Adding warning about non-service arguments for controllers #8558

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7 changes: 7 additions & 0 deletions controller.rst
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Expand Up @@ -338,6 +338,13 @@ controller's service config:
You can of course also use normal :ref:`constructor injection <services-constructor-injection>`
in your controllers.

.. caution::

You can *only* pass *services* to your controller arguments in this way. It's
not possible, for example, to pass a service parameter as a controller argument.
If you need a parameter, use the ``$this->getParameter('kernel.debug')`` shortcut
or pass the value through your controller's ``__construct()`` method.

For more information about services, see the :doc:`/service_container` article.

.. _controller-service-arguments-tag:
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