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Modify custom module’s setting.yml without reinstalling

I have made a simple custom module in Drupal 8, in which I use a settings file (config/install/my_module.settings.yml)

I have one entry, let’s say 

module:   key: 'qsdqsd'

So when I install the module, I can use this entry in my controllers. But if I need to modify anything in this file (adding an entry, for instance…) I can’t use it in my controllers (config->get(module.new_entry) returns NULL) unless I uninstall then reinstall the module.

drush cache-rebuild did not help neither.

What am I missing?

This article was republished from its original source.
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Modify custom module’s setting.yml without reinstalling

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