feat: Added download_filename_type value for old data

app/models/channel.rb

@@ -17,6 +17,7 @@ class Channel < ApplicationRecord
     macos: 'macOS', windows: 'Windows', linux: 'Linux'
   }
 
+  # 修改该变量后，记得同步修改数据库的默认值
   DEFAULT_DOWNLOAD_FILENAME_TYPE = :version_datetime
 
   enum :download_filename_type, {

db/migrate/20241127143631_add_download_file_type_to_channel.rb

@@ -1,7 +1,20 @@
 # frozen_string_literal: true
 
 class AddDownloadFileTypeToChannel < ActiveRecord::Migration[7.1]
-  def change
-    add_column :channels, :download_filename_type, :string, null: true
+  def up
+    # Ensure this incremental update migration is idempotent
+    # with monolithic install migration.
+    return if connection.column_exists?(:channels, :download_filename_type)
+
+    add_column :channels, :download_filename_type, :string
+
+    Channel.find_each do |channel|
+      # 默认值取自 `Channel.DEFAULT_DOWNLOAD_FILENAME_TYPE`
+      channel.update!(download_filename_type: 'version_datetime') if channel.download_filename_type.nil?
+    end
+  end
+
+  def down
+    remove_column :channels, :download_filename_type
   end
 end

db/schema.rb

@@ -83,7 +83,7 @@
     t.string "git_url"
     t.string "password"
     t.string "key"
-    t.string "download_filename_type", null: false
+    t.string "download_filename_type"
     t.index ["bundle_id"], name: "index_channels_on_bundle_id"
     t.index ["device_type"], name: "index_channels_on_device_type"
     t.index ["name"], name: "index_channels_on_name"