gem 'smart_settings'

class EmailSettings < SmartSettings::Base
  setting :sender,   :string, default: 'info@website.com'
  setting :domain,   :string, default: 'website.com',      group: :smtp
  setting :user,     :string, default: 'smtp@website.com', group: :smtp
  setting :password, :string, group: :smtp
end

# Get email settings using the Setting model querying
email = Setting.find(:email)

# Get email settings using the Setting model methods
email = Setting.email

# Get email settings using EmailSettings class
email = EmailSettings

# Get all setting attributes
email.all  # { sender: "info@website.com", smtp: { domain: "website.com", user: "smtp@website.com", password: nil } }

# Get all setting group attributes
email.smtp # { domain: "website.com", user: "smtp@website.com", password: nil }

# Get setting specific attributes
email.sender    # "info@website.com"
email.smtp_user # "smtp@website.com"

# Update setting attributes and save them in the settings table
email.update sender: "notify@website.com", smtp_user: "admin@website.com"

# Get setting updated attributes
email.sender    # "notify@website.com"
email.smtp_user # "admin@website.com"

class SettingsController < ApplicationController
  # Show and edit actions are omitted from the example since they usually are empty
  # New and create actions cannot be used since you cannot create new settings

  before_action :set_setting, only: [:show, :edit, :update, :destroy]

  def index
    @setting = Setting.all
  end

  def update
    if @setting.update(setting_params)
      redirect_to setting_path(@setting), notice: 'Setting was successfully updated.'
    else
      render :edit
    end
  end

  def destroy
    @setting.destroy
    redirect_to request.referrer, notice: 'Setting was successfully reset to defaults.'
  end

  private

    def set_setting
      @setting = Setting.find(params[:id])
    end

    def setting_params
      params.require(:setting).permit(@setting.permitted_attributes)
    end
end