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Optional parameter value in Symfony main config.yml

I would like to write something like this in the main application config.yml

:

my_section
  some_value: %local_value%

If the parameter local_value

is taken from a file parameters_local.yml

. However, I would like this value to be optional - if the user of the application does not provide a parameter local_value

in theirs parameters_local.yml

, I would like it to be set to null.

If I leave the config.yml

way I indicated it above and try to omit local_value

from parameters_local.yml

, I get the following error message:

[Symfony\Component\DependencyInjection\Exception\ParameterNotFoundException]  
You have requested a non-existent parameter "local_value".

Is there a way to get around this?

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1 answer


Don't use the parameter at all. The developer must decide what he or she wants to define as a parameter and what not.



  • In your configuration, specify this value as optional:

    $treeBuilder->root('my_section')
    ->children()
        ->scalarNode('some_value')->defaultValue('XYZ')->end()
    ->end()
;

  • Let the user decide what works best:

    # config.yml
my_section: ~

---

# config.yml
my_section:
    some_value: ABC

---

# parameters.yml
my_section_some_value: 123

# config.yml
my_section:
    some_value: %my_section_some_value%

---

# config.yml:
parameters:
    my_section_some_value: 321

my_section:
    some_value: %my_section_some_value%

  • Your application / library MUST NOT depend on any of the above solutions.

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