Dynamic override of Settings Model fields

Overwriting the Settings Model's getFieldConfig() method allows you to dynamically modify field configuration used for storing settings.

The following allows for overriding the configuration specified in fields.yaml only when the config key app.acme_plugin_settings is populated.

<?php

namespace Acme\Plugin\Models;

use Model;

class Settings extends Model
{
    public $implement = ['System.Behaviors.SettingsModel'];

    public $settingsCode = 'acme_plugin_settings';

    public $settingsFields = 'fields.yaml';

    protected $cache = [];

    protected $fieldConfig = null;

    /**
     * Returns the field configuration used by this model.
     */
    public function getFieldConfig()
    {
        if ($this->fieldConfig !== null) {
            return $this->fieldConfig;
        }

        if ($config = config('app.acme_plugin_settings', [])) {
            return $this->fieldConfig = (object) $config;
        }

        return $this->fieldConfig = $this->makeConfig($this->settingsFields);
    }
}