feat: 增加export_header 的 attr_json模型

lib/tallty_import_export.rb

@@ -16,6 +16,7 @@ module TalltyImportExport
   autoload :Context
   autoload :FormConvert
   autoload :Excel
+  autoload :Attr
 
   class Error < StandardError; end
 

lib/tallty_import_export/attr.rb

+require 'tallty_import_export/attr/export_header'

lib/tallty_import_export/attr/export_header.rb

+module TalltyImportExport
+  module Attr
+    class ExportHeader
+      include AttrJson::Model
+      attr_json_config(bad_cast: :as_nil, unknown_key: :allow)
+
+      attr_json :key, :string
+      attr_json :name, :string
+      attr_json :attr_type, :string
+      attr_json :format, :string
+      attr_json :method, :string
+      attr_json :chain, :string, array: true
+      attr_json :merge, :boolean
+      attr_json :json, :string
+      attr_json :select, ActiveModel::Type::Value.new, array: true
+      attr_json :source, :boolean
+      attr_json :proc, ActiveModel::Type::Value.new, array: true
+      attr_json :list, self.to_type, array: true
+    end
+  end
+end