feat: add city popularity displays by time period

- Implement new scope in City model to fetch popular cities
- Query modified to consider different time periods: today, week, month, and year
- Update Ahoy Dashboard to show top cities for each time period

This change enhances the dashboard, providing insights into city popularity over varying durations, facilitating better data analysis.

app/admin/ahoy_dashboard.rb

@@ -37,6 +37,41 @@ ActiveAdmin.register_page "Ahoy Dashboard" do
       end
     end
 
+    columns do
+      column do
+        panel "今日热门城市" do
+          table_for City.by_popularity(:today, 10) do
+            column("城市") { |city| link_to(city.name, admin_city_path(city)) }
+            column("访问量") { |city| city.view_count }
+          end
+        end
+      end
+      column do
+        panel "本周热门城市" do
+          table_for City.by_popularity(:week, 10) do
+            column("城市") { |city| link_to(city.name, admin_city_path(city)) }
+            column("访问量") { |city| city.view_count }
+          end
+        end
+      end
+      column do
+        panel "月度热门城市" do
+          table_for City.by_popularity(:month, 10) do
+            column("城市") { |city| link_to(city.name, admin_city_path(city)) }
+            column("访问量") { |city| city.view_count }
+          end
+        end
+      end
+      column do
+        panel "年度热门城市" do
+          table_for City.by_popularity(:year, 10) do
+            column("城市") { |city| link_to(city.name, admin_city_path(city)) }
+            column("访问量") { |city| city.view_count }
+          end
+        end
+      end
+    end
+
     columns do
       column do
         panel "最冷门活跃城市" do

app/models/city.rb

@@ -22,20 +22,45 @@ class City < ApplicationRecord
   scope :active, -> { where(active: true) }
   scope :inactive, -> { where(active: false) }
 
-  scope :by_popularity, -> {
+  # 在 City 模型中
-    if ActiveRecord::Base.connection.adapter_name.downcase == "sqlite"
+  scope :by_popularity, ->(period = :year, limit = 100) {
-      joins("LEFT JOIN ahoy_events ON json_extract(ahoy_events.properties, '$.city_id') = cities.id
+    # 根据时间周期确定时间范围
-             AND json_extract(ahoy_events.properties, '$.event_type') = 'city_view'")
+    time_range = 
-        .group("cities.id")
+      case period.to_sym
-        .select("cities.*, COUNT(ahoy_events.id) as visit_count")
+      when :today
-        .order("visit_count DESC")
+          Time.current.beginning_of_day..Time.current.end_of_day
+      when :week
+          Time.current.beginning_of_week..Time.current.end_of_week
+      when :month
+          Time.current.beginning_of_month..Time.current.end_of_month
+      when :year
+                   Time.current.beginning_of_year..Time.current.end_of_year
       else
-      joins("LEFT JOIN ahoy_events ON (ahoy_events.properties::jsonb->>'city_id')::integer = cities.id
+                   Time.current.beginning_of_year..Time.current.end_of_year
-             AND ahoy_events.properties::jsonb->>'event_type' = 'city_view'")
+      end
+
+    # 根据数据库类型构建不同的查询
+    base_query = if ActiveRecord::Base.connection.adapter_name.downcase == "sqlite"
+                   joins(<<-SQL.squish)
+      LEFT JOIN ahoy_events ON 
+        json_extract(ahoy_events.properties, '$.city_id') = cities.id
+        AND json_extract(ahoy_events.properties, '$.event_type') = 'city_view'
+        AND ahoy_events.time BETWEEN '#{time_range.begin}' AND '#{time_range.end}'
+    SQL
+    else
+                   joins(<<-SQL.squish)
+      LEFT JOIN ahoy_events ON 
+        (ahoy_events.properties::jsonb->>'city_id')::integer = cities.id
+        AND ahoy_events.properties::jsonb->>'event_type' = 'city_view'
+        AND ahoy_events.time BETWEEN '#{time_range.begin}' AND '#{time_range.end}'
+    SQL
+    end
+
+    base_query
       .group("cities.id")
       .select("cities.*, COUNT(ahoy_events.id) as visit_count")
       .order("visit_count DESC")
-    end
+      .limit(limit)
   }
 
   scope :least_popular_active, ->(limit = 100) {