ActiveAdmin extension to add interface to rails-setting-cached > version 2.

__ActiveAdmin_for_rails_setting_cache_v2.md

ActiveAdmin extension for rails-setting-cached > v2

This is an ActiveAdmin extension to add the interface to handle rails-setting-cached v2. For prior version I was using activeadmin_setting_cached but seems to be dead and does not support version > 2.

The initial idea was to extend that gem and do a PR, but the code is quite old and probably overcomplex. I may move this to a simple gem if there is any intereset on it.

How to use it

Just place the files in the proper places and should be ready to go.

_index.html.erb

<!-- app/views/admin/settings/_index.html.erb -->
<div>
  <%= semantic_form_for :settings, method: :post, url: { action: :update  } do |f| %>
    <table id="setting_table" class="index_table index">
      <% all_settings_by_scope.each_pair do |scope, settings| %>
        <thead>
          <tr>
            <th colspan='2'><h3><%= scope ? scope.capitalize :  I18n.t('activeadmin.rails_setting_cache.index.no_scope') %></h3></th>
          </tr>
        </thead>
        <tbody>
          <% settings.each do |setting| %>
            <tr class="odd">
              <td><strong><%= f.label setting.key %></strong></td>
              <td>
                <div class='form'>
                  <ol><%= field_for_setting(f, setting) %></ol>
                </div>
              </td>
            </tr>
          <% end %>
        </tbody>
      <% end %>
    </table>
    <%= f.submit %>
  <% end %>
</div>

admin_setting.rb

# frozen_string_literal: true

# app/admin/setting.rb
ActiveAdmin.register_page 'Setting' do
  menu label: proc { I18n.t('activeadmin.rails_setting_cache.menu.label') }

  controller { helper SettingsHelper }

  content title: 'Settings' do
    all_settings_by_scope = Setting.defined_fields.reject { |field| field[:readonly] }.group_by { |field| field[:scope] }

    render partial: 'admin/settings/index', locals: { all_settings_by_scope: all_settings_by_scope }
  end

  page_action :update, method: :post do
    @errors = ActiveModel::Errors.new(Setting.new)
    setting_params = params.require(:settings).permit!
    update_something = false

    setting_params.each_key do |key|
      setting = Setting.find_or_initialize_by(var: key)
      # NOTE: It would be amazing if from the setting we can get the field
      field = Setting.get_field(key)

      value = setting_params[key].presence
      setting.value = if field[:type] == :hash
                        value.present? ? YAML.safe_load(value) : nil
                      else
                        value&.strip
                      end

      update_something = true if setting.changed?
      setting.save
      @errors.merge!(setting.errors) unless setting.valid?
    end

    if @errors.any?
      flash[:error] = t('activeadmin.rails_setting_cache.update.error', details: @errors.full_messages.join(', '))
    else
      message = update_something ? 'success' : 'nothing_updated'
      flash[:success] = t("activeadmin.rails_setting_cache.update.#{message}")
    end

    Rails.version.to_i >= 5 ? redirect_back(fallback_location: admin_root_path) : redirect_to(:back)
  end
end

models_setting.rb

# app/models/setting.rb
# NOTE: Setting model example.

class Setting < RailsSettings::Base
  scope :testing do
    field :welcome_message, type: :string, default: -> { "welcome to TEST" }, validates: { length: { maximum: 10 } }
    field :default_locale, default: "zh-CN", validates: { presence: true, inclusion: { in: %w[zh-CN en jp] } }, option_values: %w[en zh-CN jp], help_text: "Bla bla ..."
    field :admin_emails, type: :array, default: %w[[email protected] [email protected]]
    field :user_limits, type: :integer, default: 20
    field :captcha_enable, type: :boolean, default: true

    field :notification_options, type: :hash, default: {
      send_all: true,
      logging: true,
      sender_email: "[email protected]"
    }
    field :readonly_item, type: :integer, default: 100, readonly: true
  end
end

rails_setting_cached.en.yml

# config/locales/rails_setting_cached.en.yml
en:
  activeadmin:
    rails_setting_cache:
      menu:
        label: 'Settings'
      update:
        success: 'Setting updated'
        error: 'Error updating setting. %{details}'
        nothing_updated: 'Nothing was updated'
      index:
        no_scope: 'No scope'

settings_helpers.rb

# app/helpers/settings_helpers.rb
module SettingsHelper
  def field_for_setting(form, setting)
    case setting.type
    when :boolean
      value = Setting.send("#{setting.key}?")
      form.check_box setting.key, checked: value, label: false
    when :array
      value = Setting.send(setting.key.to_s).join("\n")
      form.text_area setting.key, value: value, label: false, placeholder: setting.default.join("\n")
    when :integer
      form.number_field setting.key, label: false, value: Setting.send(setting.key.to_s), placeholder: setting.default
    when :hash
      value = YAML.dump(Setting.send(setting.key.to_s)).gsub(/^---.*\n*/,'')
      form.text_area setting.key, value: value, label: false, placeholder: YAML.dump(setting.default).gsub(/^---.*\n*/,'')
    else
      if setting[:options].key?(:option_values)
        form.select setting.key, setting[:options][:option_values], label: false, selected: Setting.send(setting.key.to_s)
      else
        value = Setting.send(setting.key.to_s)
        form.text_field setting.key, label: false, value: value, placeholder: setting.default
      end
    end
  end
end

Thanks @francirp 👍 . I need to find some time to dedicate to generate a proper gem for this.