Symfony2 undefined service parameter

Question

My service configuration is:

<services>
    <service id="my_service" class="Acme\HelloBundle\Hello">
        <argument type="service" id="search" on-invalid="null" />
        <argument>%other_bundle.class_name%</argument>
    </service>
</services>

When service "search" is not defined I get null (thanks on-invalid="null").

But what if parameter %other_bundle.class_name% is not defined in this case I got error. Is any option what set to: <argument>%other_bundle.class_name%</argument> that when parameter not exists I get null or empty string?

Thanks

Is there any real-world scenario where parameter would not be defined at all? — Jovan Perovic
– Jovan Perovic, Commented Aug 25, 2015 at 10:08
is a parameters and can be overridden by configuration, so i suggest you to simple define a default value for it. — Matteo
– Matteo, Commented Aug 25, 2015 at 10:10
Parameter would not be defined at all when is defined in other bundle and the budle is not enabled. Parameters can be overriden, thats true, but when I enable "Other" bundle with correct value earlier than this bundle with default parameter value I will get default value, so I don't want only rely on order of bundle enable. So I looking for option how set defalt emty value for parameter in <argument>%other_bundle.class_name%</argument> — Poul D.
– Poul D., Commented Aug 25, 2015 at 10:22

Jovan Perovic · Accepted Answer · 2015-08-25 10:21:14Z

1

You might be able to do it via expression language:

Following the official docs for injecting services via expressions, I believe the same can be applied to parameters:

# app/config/config.yml
services:
    my_mailer:
        class:        Acme\HelloBundle\Mailer
        arguments:    ["@=parameter('other_bundle.class_name') ?: null"]

I don't like it, as it really feels dirty but if you really need it, nobody can argue ;)

Hope this helps...

answered Aug 25, 2015 at 10:21

Jovan Perovic

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2 Comments

Matteo Over a year ago

this doesn't work: parameter condition call the getParameter method on the container. The method ``hasParametes` is not mapped by default in the expression language for container but can be custom defined.

Poul D. Over a year ago

Jovan this looks good, but it from version 2.4 and I'm using 2.3. I solved it for now with: Compiler Passes.

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