您如何处理Active Admin资源中的序列化编辑字段？

问题描述

我有一个模型，域，它有一个文本字段，名称。

 > rails g model域名：文本
调用active_record 
创建db / migrate / 20111117233221_create_domains.rb 
创建应用程序/模型/domain.rb 
>耙db：migrate 
 == CreateDomains：迁移==================================== ============= 
-create_table（：domains）
-> 0.0015s 
 == CreateDomains：迁移（0.0066s）================================== ====== 
  

我将此字段设置为序列化为模型中的数组。

 ＃app / models / domain.rb 
 class Domain< ActiveRecord :: Base 
 serialize：names，数组
 end 
  

创建ActiveAdmin此模型的资源

 > rails g active_admin：资源域
创建app / admin / domains.rb 
  

然后，在app / admin / domains.rb，我设置了各种块来处理序列化字段，例如

 ＃app / admin / domains.rb 
 ActiveAdmin.register域名
 
索引
 id_column 
列：names | domain | 
＃{domain.names.join（，，除非domain.names.nil？} 
结束
 default_actions 
结束
 
显示做|域| 
 attributes_table 
行：名称做
＃{domain.names.join（，），除非domain.names.nil？} 
结束
结束
结束
 
表格| f | 
 f.inputs域做
 f.input：names 
 end 
 f.buttons 
 end 
 
＃取param [：domain] [：name]参数，
＃拆分并保存到数组
 before_save do | domain | 
 domain.names = params [：domain] [：names] .split（，）除非params [：domain] .nil？还是params [：domain] [：names] .nil？ 
结束
结束
  

几乎所有功能都很好-我的名字显示为逗号分隔在索引中并显示视图。当我将我的姓名字段设置为 a，b，c更新记录时，before_save会将其转换为一个数组，然后通过ActiveRecord序列化保存该数组。

特别是，如果我在domain.names字段中保存了以下数组：

 ＃域中保存的名称数组active_record 
 domain.names = [ a， b， c ] 
  

如何更改：

 格式| f | 
 f.inputs域执行
 f.input：名称
 end 
 f.buttons 
 end 
  

，以便在加载 edit 表单时，在文本字段中看到 abc ，您会看到 a，b，c 。

解决方案

以下是我如何处理这种情况的摘要。我在模型中添加了一个访问器，该访问器可以将Array变成由换行符连接的字符串，然后将其拆分回Array。

 ＃app / models / domain.rb 
 class Domain< ActiveRecord :: Base 
 serialize：names，数组
 attr_accessor：names_raw 
 
 def names_raw 
 self.names.join（ \n），除非self.names 。零？ 
 end 
 
 def names_raw =（values）
 self.names = [] 
 self.names = values.split（ \n）
 end 
 end 
  

然后，在我的域管理资源中，而不是使用：names 字段，我使用了：names_raw 字段。设置该值将使用新值保存名称Array。

 ＃app / admin / domains.rb 
形式做| f | 
 f.inputs Domain执行
 f.input：names_raw，：as => ：text 
结束
 f.buttons 
结束
  

I have a model, Domain, which has a text field, names.

> rails g model Domain names:text
  invoke  active_record
  create    db/migrate/20111117233221_create_domains.rb
  create    app/models/domain.rb
> rake db:migrate
==  CreateDomains: migrating ==================================================
-- create_table(:domains)
   -> 0.0015s
==  CreateDomains: migrated (0.0066s) =========================================

I set this field as serialized into an array in the model.

# app/models/domain.rb
class Domain < ActiveRecord::Base
  serialize :names, Array
end

Create the ActiveAdmin resource for this model

> rails g active_admin:resource Domain
    create  app/admin/domains.rb

then, in the app/admin/domains.rb, I setup the various blocks to handle the serialized field as such

# app/admin/domains.rb
ActiveAdmin.register Domain do

  index do
    id_column
    column :names do |domain|
      "#{domain.names.join( ", " ) unless domain.names.nil?}"
    end
    default_actions
  end

  show do |domain|
    attributes_table do
      row :names do
        "#{domain.names.join( ", " ) unless domain.names.nil?}"
      end
    end
  end

  form do |f|
    f.inputs "Domain" do
      f.input :names
    end
    f.buttons
  end

  # before we save, take the param[:domain][:name] parameter,
  # split and save it to our array
  before_save do |domain|
    domain.names = params[:domain][:names].split(",") unless params[:domain].nil? or params[:domain][:names].nil?
  end
end

Nearly everything works great -- my names are displayed as comma separated in the index and show views. When I update a record with my names field set to "a,b,c", the before_save works to turn that into an array that is then saved via the ActiveRecord serialize.

What I can not solve is how to make the edit form put in a comma-separated list into the text field. I tried using a partial and using formtastic syntax directly as well as trying to make it work via the active_admin DLS syntax. Does anyone know how to make this work?

Specifically, if I have the following array saved in my domain.names field:

# array of names saved in the domain active_record
domain.names = ["a", "b", "c"]

how to change:

      form do |f|
        f.inputs "Domain" do
          f.input :names
        end
        f.buttons
      end

so that when the edit form is loaded, in the text field instead of seeing abc, you see a,b,c.

解决方案

Here is a summary of how I handled this situation. I added an accessor to the model which can turn the Array into a string joined by a linefeed and split it back to an Array.

# app/models/domain.rb
class Domain < ActiveRecord::Base
  serialize       :names, Array
  attr_accessor   :names_raw

  def names_raw
    self.names.join("\n") unless self.names.nil?
  end

  def names_raw=(values)
    self.names = []
    self.names=values.split("\n")
  end
end

then, in my admin resource for domain, instead of using the :names field, I used the :names_raw field. setting this value would save the names Array with the new values.

# app/admin/domains.rb
form do |f|
  f.inputs "Domain" do
    f.input :names_raw, :as => :text
  end
  f.buttons
end

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