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Adding sequence item to configuration

I have a configuration item in my custom module, part of which is a sequence, basically I’m attempting to create something akin to an array of items

my_module.schema.yml

my_module.settings:   type: config_object   label: 'Configuration'   mapping:     custom_fields:       label: 'Custom Fields'       type: sequence       sequence:         type: mapping         label: 'Custom Field'         mapping:           field_label:             type: string             label: 'Field Label'           field_key:             type: string             label: 'Field Key'

What I want to be able to do is add a new item to this ‘list’ as desired, but for the most part up to now (in other areas of my module) I’ve just been using $config->set(key, value) which will just overwrite the current setting, is there a method to add another value to the existing setting, or do I have to load the existing configuration, add it in manually, then save over the whole lot?

This article was republished from its original source.
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Adding sequence item to configuration

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