Ruby on Rails中未定义的方法“unserialize_attribute”

unserialize_attribute 被从 rails-5 但是你可以用不同的方式来实现价值的非市场化,

方法: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: 准确地说,有些人更愿意接受属性值 @user.accessible_attribute.to_yaml 也。

我用它来工作 serializable_hash 它在 rails 3 以及在 rails 5

我用Rails 3编写了这个代码

unserialized_value = unserialize_attribute(options[:serialized_column]) || { }

我改成了

unserialized_value = self.serializable_hash[options[:serialized_column]] || { }

两个方法都返回相同的哈希对象。