在rails上的ruby中的undefined方法`unserialize_attribute'

Question

我正在升级rails应用程序,我有一个方法 unserialize_attribue,rails 3但我无法看到这个方法rails 5.

unserialize_attribute在rails 5中有什么替代方案或者我可以做什么的任何建议,谢谢

Answer 1

unserialize_attribute从中删除,rails-5但您可以以不同的方式反序列化值,

制法:1

> @user.accessible_attribute
# => {"attr1"=>["Email id"], "attr2"=>["First Name"], "attr3"=>["Last Name"]}

> @user.attributes_before_type_cast['accessible_attribute']
# => "--- !ruby/hash:ActionController::Parameters\nattr1:\n- Email id\nattr2:\n- First Name\nattr3:\n- Last Name\n"

方法:2

@user.instance_variable_get(:@attributes)['accessible_attribute'].value_before_type_cast
# => "--- !ruby/hash:ActionController::Parameters\nattr1:\n- Email id\nattr2:\n- First Name\nattr3:\n- Last Name\n"

方法:3

> @accessible_attribute = ActiveRecord::Base.connection.execute("SELECT accessible_attribute FROM users WHERE id = #{@user.id}")
   (0.4ms)  SELECT accessible_attribute FROM users WHERE id = 3
# => #<Mysql2::Result:0xe0fc374 @query_options={:as=>:array, :async=>false, :cast_booleans=>false, :symbolize_keys=>false, :database_timezone=>:utc, :application_timezone=>nil, :cache_rows=>true, :connect_flags=>-2147442171, :cast=>true, :default_file=>nil, :default_group=>nil, :adapter=>"mysql2", :encoding=>"utf8mb4", :collation=>"utf8mb4_unicode_ci", :database=>"example_development", :pool=>5, :username=>"root", :password=>"password", :socket=>"/var/run/mysqld/mysqld.sock", :flags=>2}>

> @accessible_attribute.first[0]
# => "--- !ruby/hash:ActionController::Parameters\nattr1:\n- Email id\nattr2:\n- First Name\nattr3:\n- Last Name\n"

注意:确切地说,有些人更喜欢将属性值取消序列化@user.accessible_attribute.to_yaml.