Introduction

There are two ways to configure plugins - with back-end settings forms and with configuration files. Using database settings with back-end pages provide a better user experience, but they carry more overhead for the initial development. File-based configuration is suitable for configuration that is rarely modified.

Database settings

You can create models for storing settings in the database by implementing the SettingsModel behavior in a model class. This model can be used directly for creating the back-end settings form. You don't need to create a database table and a controller for creating the back-end settings forms based on the settings model.

The settings model classes should extend the Model class and implement the System.Behaviors.SettingsModel behavior. The settings models, like any other models, should be defined in the models subdirectory of the plugin directory. The model from the next example should be defined in the plugins/acme/demo/models/Settings.php script.

<?php namespace Acme\Demo\Models;

use Model;

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

    // A unique code
    public $settingsCode = 'acme_demo_settings';

    // Reference to field configuration
    public $settingsFields = 'fields.yaml';
}

The $settingsCode property is required for settings models. It defines the unique settings key which is used for saving the settings to the database.

The $settingsFields property is required if are going to build a back-end settings form based on the model. The property specifies a name of the YAML file containing the form fields definition. The form fields are described in the Backend forms article. The YAML file should be placed to the directory with the name matching the model class name in lowercase. For the model from the previous example the directory structure would look like this:

plugins/
  acme/
    demo/
      models/
        settings/        <=== Model files directory
          fields.yaml    <=== Model form fields
        Settings.php     <=== Model script

Settings models can be registered to appear on the back-end Settings page, but it is not a requirement - you can set and read settings values like any other model.

Writing to a settings model

The settings model has the static set method that allows to save individual or multiple values. You can also use the standard model features for setting the model properties and saving the model.

use Acme\Demo\Models\Settings;

...

// Set a single value
Settings::set('api_key', 'ABCD');

// Set an array of values
Settings::set(['api_key' => 'ABCD']);

// Set object values
$settings = Settings::instance();
$settings->api_key = 'ABCD';
$settings->save();

Reading from a settings model

The settings model has the static get method that enables you to load individual properties. Also, when you instantiate a model with the instance method, it loads the properties from the database and you can access them directly.

// Outputs: ABCD
echo Settings::instance()->api_key;

// Get a single value
echo Settings::get('api_key');

// Get a value and return a default value if it doesn't exist
echo Settings::get('is_activated', true);

Back-end settings pages

The back-end contains a dedicated area for housing settings and configuration, it can be accessed by clicking the Settings link in the main menu. The Settings page contains a list of links to the configuration pages registered by the system and other plugins.

Settings link registration

The back-end settings navigation links can be extended by overriding the registerSettings method inside the Plugin registration class. When you create a configuration link you have two options - create a link to a specific back-end page, or create a link to a settings model. The next example shows how to create a link to a back-end page.

public function registerSettings()
{
    return [
        'location' => [
            'label'       => 'Locations',
            'description' => 'Manage available user countries and states.',
            'category'    => 'Users',
            'icon'        => 'icon-globe',
            'url'         => Backend::url('acme/user/locations'),
            'order'       => 500,
            'keywords'    => 'geography place placement'
        ]
    ];
}

Note: Back-end settings pages should set the settings context in order to mark the corresponding settings menu item active in the System page sidebar. Settings context for settings models is detected automatically.

The following example creates a link to a settings model. Settings models is a part of the settings API which is described above in the Database settings section.

public function registerSettings()
{
    return [
        'settings' => [
            'label'       => 'User Settings',
            'description' => 'Manage user based settings.',
            'category'    => 'Users',
            'icon'        => 'icon-cog',
            'class'       => 'Acme\User\Models\Settings',
            'order'       => 500,
            'keywords'    => 'security location',
            'permissions' => ['acme.users.access_settings']
        ]
    ];
}

The optional keywords parameter is used by the settings search feature. If keywords are not provided, the search uses only the settings item label and description.

Setting the page navigation context

Just like setting navigation context in the controller, Back-end settings pages should set the settings navigation context. It's required in order to mark the current settings link in the System page sidebar as active. Use the System\Classes\SettingsManager class to set the settings context. Usually it could be done in the controller constructor:

public function __construct()
{
    parent::__construct();

    [...]

    BackendMenu::setContext('October.System', 'system', 'settings');
    SettingsManager::setContext('You.Plugin', 'settings');
}

The first argument of the setContext method is the settings item owner in the following format: author.plugin. The second argument is the setting name, the same as you provided when registering the back-end settings page.

File-based configuration

Plugins can have a configuration file config.php in the config subdirectory of the plugin directory. The configuration files are PHP scripts that define and return an array. Example configuration file plugins/acme/demo/config/config.php:

<?php

return [
    'maxItems' => 10,
    'display' => 5
];

Use the Config class for accessing the configuration values defined in the configuration file. The Config::get($name, $default = null) method accepts the plugin and the parameter name in the following format: Acme.Demo::maxItems. The second optional parameter defines the default value to return if the configuration parameter doesn't exist. Example:

use Config;

...

$maxItems = Config::get('acme.demo::maxItems', 50);

A plugin configuration can be overridden by the application by creating a configuration file config/author/plugin/config.php, for example config/acme/todo/config.php, or config/acme/todo/dev/config.php for different environment. Inside the overridden configuration file you can return only values you want to override:

<?php

return [
    'maxItems' => 20
];

If you want to use seperate configurations across different environments (eg: dev, production), simply create another file in config/author/plugin/environment/config.php. Replace environment with the environment name. This will be merged with config/author/plugin/config.php.

Example:

config/author/plugin/production/config.php:

<?php

return [
    'maxItems' => 25
];

This will set maxItems to 25 when APP_ENV is set to production.