feat: enhance weather arts and cities features

- Add slug column to weather_arts for friendly URLs.
- Update weather arts retrieval in the controller to use slug.
- Implement region and country filtering in cities index view.
- Optimize city queries with scopes for active status and region/country.
- Improve UI layout and design for the cities index page.

These changes allow better user experience by enabling cleaner URLs for weather arts and facilitating efficient filtering of cities based on selected regions and countries.

app/admin/weather_arts.rb

@@ -1,4 +1,9 @@
 ActiveAdmin.register WeatherArt do
+  controller do
+    def find_resource
+      scoped_collection.friendly.find(params[:id])
+    end
+  end
   # See permitted parameters documentation:
   # https://github.com/activeadmin/activeadmin/blob/master/docs/2-resource-customization.md#setting-up-strong-parameters
   #

app/controllers/cities_controller.rb

@@ -1,6 +1,18 @@
 class CitiesController < ApplicationController
   def index
     @cities = City.all.order(:name)
+    @regions = Region.includes(:countries).order(:name)
+    @cities = City.includes(:country, country: :region).active.order(:name)
+
+    if params[:region]
+      @current_region = Region.friendly.find(params[:region])
+      @cities = @cities.by_region(@current_region.id)
+    end
+
+    if params[:country]
+      @current_country = Country.friendly.find(params[:country])
+      @cities = @cities.by_country(@current_country.id)
+    end
   end
 
   def show

app/controllers/weather_arts_controller.rb

@@ -1,6 +1,6 @@
 class WeatherArtsController < ApplicationController
   def show
     @city = City.friendly.find(params[:city_id])
-    @weather_art = @city.weather_arts.find(params[:id])
+    @weather_art = @city.weather_arts.friendly.find(params[:slug])
   end
 end

app/models/city.rb

@@ -1,6 +1,6 @@
 class City < ApplicationRecord
   extend FriendlyId
-  friendly_id :name, use: :slugged
+  friendly_id :slug_candidates, use: :slugged
   belongs_to :country
 
   has_many :weather_arts, dependent: :destroy
@@ -11,10 +11,21 @@ class City < ApplicationRecord
 
   delegate :region, to: :country
 
+  scope :by_region, ->(region_id) { joins(:country).where(countries: { region_id: region_id }) }
+  scope :by_country, ->(country_id) { where(country_id: country_id) }
+  scope :active, -> { where(active: true) }
+
   def to_s
     name
   end
 
+  def slug_candidates
+    [
+      :name,
+      [ :country, :name ]
+    ]
+  end
+
   def localized_name
     I18n.t("cities.#{name.parameterize.underscore}")
   end

app/models/weather_art.rb

@@ -1,11 +1,21 @@
 class WeatherArt < ApplicationRecord
-  belongs_to :city
+  extend FriendlyId
+  friendly_id :weather_date, use: :slugged
 
+  belongs_to :city
   has_one_attached :image
 
   validates :weather_date, presence: true
   validates :city_id, presence: true
 
+  def should_generate_new_friendly_id?
+    weather_date_changed? || city_id_changed? || super
+  end
+
+  def to_s
+    "#{city.name} - #{weather_date.strftime('%Y-%m-%d')}"
+  end
+
   def self.ransackable_associations(auth_object = nil)
     [ "city", "image_attachment", "image_blob" ]
   end

app/views/cities/index.html.erb

@@ -1,35 +1,119 @@
-<div class="container mx-auto px-4 py-16">
-  <div class="text-center mb-16 space-y-4">
-    <h1 class="text-4xl md:text-5xl font-display font-bold">Explore Cities</h1>
-    <p class="text-xl text-base-content/70 max-w-2xl mx-auto">
+<div class="min-h-screen">
+
+  <!-- 页面标题 -->
+  <div class="bg-gradient-to-r from-primary/10 to-secondary/10 py-12">
+    <div class="container mx-auto px-4">
+      <h1 class="text-4xl md:text-5xl font-display font-bold text-center mb-4">
+        Explore Cities
+      </h1>
+      <p class="text-xl text-center text-base-content/70 max-w-2xl mx-auto">
         Discover AI-generated weather art from cities around the world
       </p>
     </div>
+  </div>
 
+  <!-- 筛选导航 -->
+  <div class="container mx-auto px-4 py-8">
+    <div class="flex flex-wrap gap-4 items-center justify-center mb-8">
+      <%= link_to "All Regions",
+                  cities_path,
+                  class: "btn btn-outline #{'btn-primary' unless @current_region}" %>
+
+      <% @regions.each do |region| %>
+        <%= link_to region.name,
+                    cities_path(region: region.slug),
+                    class: "btn btn-outline #{'btn-primary' if @current_region == region}" %>
+      <% end %>
+    </div>
+
+    <% if @current_region %>
+      <div class="flex flex-wrap gap-4 items-center justify-center mb-8">
+        <%= link_to "All Countries in #{@current_region.name}",
+                    cities_path(region: @current_region.slug),
+                    class: "btn btn-sm btn-ghost #{'btn-active' unless @current_country}" %>
+
+        <% @current_region.countries.order(:name).each do |country| %>
+          <%= link_to country.name,
+                      cities_path(region: @current_region.slug, country: country.slug),
+                      class: "btn btn-sm btn-ghost #{'btn-active' if @current_country == country}" %>
+        <% end %>
+      </div>
+    <% end %>
+
+    <!-- 当前选择显示 -->
+    <div class="text-center mb-8">
+      <div class="breadcrumbs text-sm justify-center">
+        <ul>
+          <li><%= link_to "All Regions", cities_path %></li>
+          <% if @current_region %>
+            <li><%= @current_region.name %></li>
+          <% end %>
+          <% if @current_country %>
+            <li><%= @current_country.name %></li>
+          <% end %>
+        </ul>
+      </div>
+    </div>
+  </div>
+
+  <!-- 城市网格 -->
+  <div class="container mx-auto px-4 pb-16">
     <div class="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-8">
       <% @cities.each do |city| %>
-      <% latest_art = city.weather_arts.last %>
-      <div class="card bg-base-100 shadow-xl hover:shadow-2xl transition-all duration-300 group">
-        <% if latest_art&.image&.attached? %>
-          <figure class="relative aspect-[16/9] overflow-hidden">
-            <%= image_tag latest_art.image,
+        <div class="card bg-base-100 shadow-xl hover:shadow-2xl transition-all duration-300 group overflow-hidden">
+          <% if city.latest_weather_art&.image&.attached? %>
+            <figure class="relative aspect-[16/9]">
+              <%= image_tag city.latest_weather_art.image,
                             class: "w-full h-full object-cover transform group-hover:scale-105 transition-transform duration-500" %>
               <div class="absolute inset-0 bg-gradient-to-t from-black/60 to-transparent"></div>
+              <div class="absolute bottom-0 left-0 right-0 p-6">
+                <h3 class="text-2xl font-display text-white mb-1">
+                  <%= city.name %>
+                </h3>
+                <p class="text-white/80 text-sm">
+                  <%= city.country.name %>, <%= city.region.name %>
+                </p>
+              </div>
             </figure>
+          <% else %>
+            <div class="card-body">
+              <h3 class="card-title font-display"><%= city.name %></h3>
+              <p class="text-base-content/70">
+                <%= city.country.name %>, <%= city.region.name %>
+              </p>
+              <div class="flex gap-2 text-sm text-base-content/60">
+                <span>Lat: <%= city.latitude %></span>
+                <span>Long: <%= city.longitude %></span>
+              </div>
+            </div>
           <% end %>
 
-        <div class="card-body relative">
-          <h2 class="card-title font-display text-2xl"><%= city.localized_name %></h2>
-          <div class="text-base-content/70">
-            <p>Lat: <%= city.latitude %></p>
-            <p>Long: <%= city.longitude %></p>
+          <div class="card-body <%= 'pt-0' if city.latest_weather_art&.image&.attached? %>">
+            <div class="flex gap-4 text-sm text-base-content/70">
+              <div class="flex items-center gap-1">
+                <svg xmlns="http://www.w3.org/2000/svg" class="h-4 w-4" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+                  <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M17.657 16.657L13.414 20.9a1.998 1.998 0 01-2.827 0l-4.244-4.243a8 8 0 1111.314 0z" />
+                  <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M15 11a3 3 0 11-6 0 3 3 0 016 0z" />
+                </svg>
+                <%= city.timezone %>
               </div>
+              <% if city.latest_weather_art %>
+                <div class="flex items-center gap-1">
+                  <svg xmlns="http://www.w3.org/2000/svg" class="h-4 w-4" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+                    <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 8v4l3 3m6-3a9 9 0 11-18 0 9 9 0 0118 0z" />
+                  </svg>
+                  <%= city.latest_weather_art.weather_date.strftime("%b %d, %Y") %>
+                </div>
+              <% end %>
+            </div>
+
             <div class="card-actions justify-end mt-4">
-            <%= link_to "View Weather Art", city_path(city),
-                        class: "btn btn-primary" %>
+              <%= link_to "View Details", city_path(city),
+                          class: "btn btn-primary btn-sm" %>
             </div>
           </div>
         </div>
       <% end %>
     </div>
+  </div>
 </div>

config/routes.rb

@@ -1,8 +1,8 @@
 Rails.application.routes.draw do
   root "home#index"
 
-  resources :cities, only: [ :index, :show ] do
-    resources :weather_arts, only: [ :show ]
+  resources :cities, only: [:index, :show] do
+    resources :weather_arts, path: 'weather', only: [:show], param: :slug
   end
 
   # namespace :admin do

db/migrate/20250122053220_add_slug_to_weather_arts.rb

@@ -0,0 +1,6 @@
+class AddSlugToWeatherArts < ActiveRecord::Migration[8.0]
+  def change
+    add_column :weather_arts, :slug, :string
+    add_index :weather_arts, :slug, unique: true
+  end
+end

db/schema.rb

@@ -10,17 +10,14 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[8.0].define(version: 2025_01_21_020653) do
-  # These are extensions that must be enabled in order to support this database
-  enable_extension "pg_catalog.plpgsql"
-
+ActiveRecord::Schema[8.0].define(version: 2025_01_22_053220) do
   create_table "active_admin_comments", force: :cascade do |t|
     t.string "namespace"
     t.text "body"
     t.string "resource_type"
-    t.bigint "resource_id"
+    t.integer "resource_id"
     t.string "author_type"
-    t.bigint "author_id"
+    t.integer "author_id"
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
     t.index ["author_type", "author_id"], name: "index_active_admin_comments_on_author"
@@ -80,7 +77,7 @@ ActiveRecord::Schema[8.0].define(version: 2025_01_21_020653) do
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
     t.string "slug"
-    t.bigint "country_id", null: false
+    t.integer "country_id", null: false
     t.index ["country_id"], name: "index_cities_on_country_id"
     t.index ["slug"], name: "index_cities_on_slug", unique: true
   end
@@ -89,7 +86,7 @@ ActiveRecord::Schema[8.0].define(version: 2025_01_21_020653) do
     t.string "name"
     t.string "code"
     t.string "slug"
-    t.bigint "region_id", null: false
+    t.integer "region_id", null: false
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
     t.index ["code"], name: "index_countries_on_code", unique: true
@@ -119,7 +116,7 @@ ActiveRecord::Schema[8.0].define(version: 2025_01_21_020653) do
   end
 
   create_table "weather_arts", force: :cascade do |t|
-    t.bigint "city_id", null: false
+    t.integer "city_id", null: false
     t.date "weather_date"
     t.string "description"
     t.decimal "temperature"
@@ -134,7 +131,9 @@ ActiveRecord::Schema[8.0].define(version: 2025_01_21_020653) do
     t.text "prompt"
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
+    t.string "slug"
     t.index ["city_id"], name: "index_weather_arts_on_city_id"
+    t.index ["slug"], name: "index_weather_arts_on_slug", unique: true
   end
 
   add_foreign_key "active_storage_attachments", "active_storage_blobs", column: "blob_id"