fix: parse timezones as JSON

- Updated timezone parsing to handle JSON format.
- Modified how timezones are fetched in multiple models.
- Added a migration to convert existing timezones data.
- Modified the country model to format timezones.

This commit fixes an issue where the timezone data was not
being correctly parsed, leading to potential errors in time
calculations.  The changes ensure the application correctly
handles and displays timezone information, improving the
accuracy of time-related features.

app/models/city.rb

@@ -218,7 +218,7 @@ class City < ApplicationRecord
   def formatted_current_time(type = :date, use_local_timezone = true)
     # 获取时区
     timezone_info = self.country&.timezones.present? ?
-                      country&.timezones&.first :
+                      JSON.parse(country.timezones)&.first :
                       { "zoneName" => "UTC", "gmtOffsetName" => "UTC+00:00" }
 
     # 设置时区对象

app/models/country.rb

@@ -2,6 +2,8 @@ class Country < ApplicationRecord
   extend FriendlyId
   friendly_id :name, use: :slugged
 
+  before_save :format_timezones
+
   belongs_to :region, optional: true
   belongs_to :subregion, optional: true
   has_many :cities, dependent: :restrict_with_error
@@ -11,7 +13,6 @@ class Country < ApplicationRecord
   validates :code, presence: true, uniqueness: true
   validates :iso2, uniqueness: true, allow_blank: true
 
-  attribute :timezones, :jsonb
 
   def to_s
     name
@@ -28,4 +29,15 @@ class Country < ApplicationRecord
   def self.ransackable_associations(auth_object = nil)
     [ "cities", "region" ]
   end
+
+  private
+
+  def format_timezones
+    if timezones.is_a?(String)
+      # 先尝试转换成 Ruby 对象
+      ruby_obj = eval(timezones)
+      # 然后转换成标准 JSON
+      self.timezones = ruby_obj.to_json
+    end
+  end
 end

app/models/weather_art.rb

@@ -71,7 +71,7 @@ class WeatherArt < ApplicationRecord
   def formatted_time(type = :date, use_local_timezone = false)
     # 获取时区
     timezone_info = self.city&.country&.timezones.present? ?
-                      self.city.country&.timezones&.first :
+                      JSON.parse(self.city.country.timezones)&.first :
                       { "zoneName" => "UTC", "gmtOffsetName" => "UTC+00:00" }
 
     # 设置时区对象

app/workers/batch_generate_weather_arts_worker.rb

@@ -62,7 +62,11 @@ class BatchGenerateWeatherArtsWorker
 
   def get_local_time(city)
     return Time.current unless city
-    timezone_info = city.country&.timezones&.first
+    timezone_info =
+      city.country&.timezones.present? ?
+        JSON.parse(city.country.timezones)&.first :
+        { "zoneName": "UTC" }
+
     return Time.current unless timezone_info
 
     timezone = ActiveSupport::TimeZone[timezone_info["zoneName"]] ||

db/migrate/20250215084540_convert_country_timezones_to_json.rb

@@ -1,42 +0,0 @@
-class ConvertCountryTimezonesToJson < ActiveRecord::Migration[8.0]
-  def up
-    # 1. 首先添加一个临时列
-    add_column :countries, :timezones_json, :jsonb
-
-    # 2. 转换现有数据
-    Country.find_each do |country|
-      if country.timezones.present?
-        begin
-          # 尝试解析现有的 timezones 字符串
-          parsed_timezones = eval(country.timezones) # 这里使用 eval 是为了处理历史数据
-          country.update_column(:timezones_json, parsed_timezones)
-        rescue => e
-          puts "Error converting timezones for country #{country.id}: #{e.message}"
-          # 设置默认值
-          country.update_column(:timezones_json, [ { "zoneName" => "UTC", "gmtOffsetName" => "UTC+00:00" } ])
-        end
-      else
-        # 设置默认值
-        country.update_column(:timezones_json, [ { "zoneName" => "UTC", "gmtOffsetName" => "UTC+00:00" } ])
-      end
-    end
-
-    # 3. 删除旧列并重命名新列
-    remove_column :countries, :timezones
-    rename_column :countries, :timezones_json, :timezones
-  end
-
-  def down
-    # 回滚操作
-    add_column :countries, :timezones_string, :text
-
-    Country.find_each do |country|
-      if country.timezones.present?
-        country.update_column(:timezones_string, country.timezones.to_s)
-      end
-    end
-
-    remove_column :countries, :timezones
-    rename_column :countries, :timezones_string, :timezones
-  end
-end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[8.0].define(version: 2025_02_15_084540) do
+ActiveRecord::Schema[8.0].define(version: 2025_02_11_035423) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "pg_catalog.plpgsql"
 
@@ -158,7 +158,7 @@ ActiveRecord::Schema[8.0].define(version: 2025_02_15_084540) do
     t.boolean "flag", default: true
     t.string "wiki_data_id"
     t.bigint "subregion_id"
-    t.jsonb "timezones"
+    t.text "timezones"
     t.index ["code"], name: "index_countries_on_code", unique: true
     t.index ["region_id"], name: "index_countries_on_region_id"
     t.index ["slug"], name: "index_countries_on_slug", unique: true