10000 Added some examples to the "services as parameters" section by javiereguiluz · Pull Request #3641 · symfony/symfony-docs · GitHub
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Added some examples to the "services as parameters" section #3641

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Added some examples to the "services as parameters" section #3641

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Added some examples to the "services as parameters" section
javiereguiluz Mar 6, 2014
745f3a6
Removed the file path comments because this doc is for the component
javiereguiluz Mar 8, 2014
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31 changes: 31 additions & 0 deletions components/dependency_injection/parameters.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -344,6 +344,15 @@ Start the string with ``@`` or ``@?`` to reference a service in YAML.
* ``@?mailer`` references the ``mailer`` service. If the service does not
exist, it will be ignored;

.. code-block:: yaml

parameters:
# if 'my_mailer' service isn't defined, an exception will be raised
foo: @my_mailer

# if 'my_logger' service isn't defined, 'bar' will be null
bar: @?my_logger

.. tip::

Use ``@@`` to escape the ``@`` symbol in YAML. ``@@mailer`` will be
Expand All @@ -359,6 +368,16 @@ is thrown. Valid values for ``on-invalid`` are ``null`` (uses ``null`` in place
of the missing service) or ``ignored`` (very similar, except if used on a
method call, the method call is removed).

.. code-block:: xml

<parameters>
<!-- if 'my_mailer' service isn't defined, an exception will be raised -->
<parameter key="foo" type="service" id="my_mailer" />

<!-- if 'my_logger' service isn't defined, 'bar' will be null -->
<parameter key="bar" type="service" id="my_logger" on-invalid="null" />
</parameters>

PHP
~~~

Expand All @@ -367,3 +386,15 @@ In PHP, you can use the
a service. The invalid behavior is configured using the second constructor
argument and constants from
:class:`Symfony\\Component\\DependencyInjection\\ContainerInterface`.

.. code-block:: php

use Symfony\Component\DependencyInjection\Reference;

// if 'my_mailer' service isn't defined, an exception will be raised
$container->setParameter('foo', new Reference('my_mailer'));

// if 'my_logger' service isn't defined, 'bar' will be null
$container->setParameter('bar', new Reference('my_logger',
ContainerInterface::NULL_ON_INVALID_REFERENCE
));
0