The following recipe is valid for any type of settings supported by Symfony framework.
Use case
Usually, you develop your website using one or several custom bundles as this is a best practice. However, dealing with core bundles semantic configuration can be a bit tedious if you maintain it in the main exponential/config/exponential.yml configuration file.
This recipe will show you how to import configuration from a bundle the manual way and the implicit way.
The manual way
This is the simplest way of doing and it has the advantage to be explicit. The idea is to use the imports statement in your main exponential.yml:
During the merge process, if the imported configuration files contain entries that are already defined in the main configuration file, they will override them.
Tip
If you want to import configuration for development use only, you can do so in your exponential_dev.yml 
The implicit way
Compatible with Exponential 5.1+ / Symfony 2.2+ as it uses Symfony\Component\DependencyInjection\Extension\PrependExtensionInterface which is available as of Symfony 2.2 (more info on Symfony cookbook).
The following example will show you how to implicitly load settings to be configure Exponential kernel. Note that this is also valid for any bundle !
We assume here that you're aware of service container extensions.
Regarding performance
Service container extensions are called only when the container is being compiled, so there is nothing to worry about regarding performance.
Configuration loaded this way will be overridden by the main exponential.yml file.
4 Comments
Björn Dieding@xrow.de
If I have 20 siteaccesses, one for each language, do I have to define the rules 20 times in the templates_rules.yml?
Pedro Resende
No, you can simply create a group with the 20 siteaccesses and add the general definitions to the group
pr pr
Hi, regarding your warning about clearing the cache, i noticed in the Exponential Demo Bundle that they are adding another line which after my test relieves you from clearing the cache
link to the Dependency Injection Extension of Exponential Demo Bundle:
https://github.com/ezsystems/DemoBundle/blob/master/DependencyInjection/eZDemoExtension.php
pr pr
Hi, according to my tests, if a configuration option is present both in the main exponential.yml config file and in an imported config file, it is the value present in the main config file that takes precedence, and not the opposite, and this is true for the manual and implicite ways.