如何使用 best_in_place gem 更改序列化数据? [英] How can I change serialized data using the best_in_place gem?

问题描述

我有一个包含序列化数据的模型，我想使用 best_in_place gem 编辑此数据.使用 best_in_place gem 时，默认情况下这是不可能的.这怎么办?

I have a model with serialized data and I want to edit this data using the best_in_place gem. This isn't possible by default when using the best_in_place gem. How can this be done?

推荐答案

可以通过扩展 method_missing 和 respond_to_missing? 将请求转发到序列化数据来实现.假设您在 data 中有序列化的 Hash.例如，在包含序列化数据的类中，您可以使用以下代码:

It can be done by extending method_missing and respond_to_missing? to forward the requests to the serialized data. Lets say you have your serialized Hash in data. In the class that's containing the serialized data you can for example use this code:

def method_missing(method_name, *arguments, &block) # forewards the arguments to the correct methods
  if method_name.to_s =~ /data_(.+)\=/
    key = method_name.to_s.match(/data_(.+)=/)[1]
    self.send('data_setter=', key, arguments.first)
  elsif method_name.to_s =~ /data_(.+)/
    key = method_name.to_s.match(/data_(.+)/)[1]
    self.send('data_getter', column_number)
  else
    super
  end
end

def respond_to_missing?(method_name, include_private = false) # prevents giving UndefinedMethod error
  method_name.to_s.start_with?('data_') || super
end

def data_getter(key)
  self.data[key.to_i] if self.data.kind_of?(Array)
  self.data[key.to_sym] if self.data.kind_of?(Hash)
end

def data_setter(key, value)
  self.data[key.to_i] = value if self.data.kind_of?(Array)
  self.data[key.to_sym] = value if self.data.kind_of?(Hash)
  value # the method returns value because best_in_place sets the returned value as text
end

现在您可以使用 getter object.data_name 访问 object.data[:name] 并使用 setter object.data_name="test" 设置值.但是要使用 best_in_place 使其正常工作，您需要将其动态添加到 attr_accessible 列表中.为此，您需要更改 mass_assignment_authorizer 的行为，并使对象响应 accessable_methods 的方法名称数组，这些方法名称应该允许像这样

Now you can access the object.data[:name] using the getter object.data_name and set value using the setter object.data_name="test". But to get this working using best_in_place you need to dynamicly add it to the attr_accessible list. To do this you need to change the behavior of the mass_assignment_authorizer and make the object respond to accessable_methods with an array of method names that should be allowed to be edited like this:

def accessable_methods # returns a list of all the methods that are responded dynamicly
  self.data.keys.map{|x| "data_#{x.to_s}".to_sym }
end

private
  def mass_assignment_authorizer(user) # adds the list to the accessible list.
    super + self.accessable_methods
  end

所以在视图中你现在可以调用

So in the View you can now call

  best_in_place @object, :data_name

编辑@object.data[:name]的序列化数据

To edit the serialized data of @object.data[:name]

//您也可以使用元素索引而不是属性名称对数组执行此操作:

// You can also do this for an array using the element index instead of the attribute name:

<% @object.data.count.times do |index| %>
  <%= best_in_place @object, "data_#{index}".to_sym %>
<% end %>

您无需更改其余代码.

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