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Explain the prefix used for expressions in YAML files #12765

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Dec 7, 2019
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Explain the prefix used for expressions in YAML files #12765

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2 changes: 2 additions & 0 deletions service_container/expression_language.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,7 @@ to another service: ``AppBundle\Mailer``. One way to do this is with an expressi
AppBundle\Mail\MailerConfiguration: ~

AppBundle\Mailer:
# the '@=' prefix is required when using expressions for arguments in YAML files
arguments: ["@=service('AppBundle\\\\Mail\\\\MailerConfiguration').getMailerMethod()"]

.. code-block:: xml
Expand Down Expand Up @@ -80,6 +81,7 @@ via a ``container`` variable. Here's another example:

services:
AppBundle\Mailer:
# the '@=' prefix is required when using expressions for arguments in YAML files
arguments: ["@=container.hasParameter('some_param') ? parameter('some_param') : 'default_value'"]

.. code-block:: xml
Expand Down