today_ai_weather/app/controllers/arts_controller.rb

class ArtsController < ApplicationController
  def index
    @regions = Region.all
    @current_region = Region.find(params[:region]) if params[:region].present?

    @weather_arts = WeatherArt.includes(city: [ :country, { country: :region } ])

    if @current_region
      @weather_arts = @weather_arts.joins(city: :country)
                                   .where(countries: { region_id: @current_region.id })
    end

    @weather_arts = if params[:sort] == "oldest"
                      @weather_arts.order(created_at: :asc)
    else
                      @weather_arts.order(created_at: :desc)
    end

    @weather_arts = @weather_arts.page(params[:page]).per(10)
  end
end