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我有一个场景，我创建了一些 has_many :through 关联，但我无法更新。我很感激任何帮助。

这是我的设置：

  • 红宝石 1.9.3p392
  • 导轨 3.2.13

这是场景：

  • 我有 3 个相关的模型
  • 行业多，关键词多，会议多
  • 行业有很多关键词
  • 会议有一个行业
  • 会议根据其行业选择关键字

关键字有一个基本的 CRUD 模型。创建一个行业然后添加关键字可以正常工作。

我与会议、行业和关键字的关系是我遇到问题的地方。我正在尝试更新会议信息，更改当前关联的行业，根据新行业选择新关键字，所有这些都以相同的形式。当我从组合中删除关键字元素时，更新工作。但是当所有三个都在那里时，我就会得到错误。

我对行业和关键字的关系是：

class IKeywordable < ActiveRecord::Base

attr_accessible :industry_id, :keyword_id

belongs_to :industry
belongs_to :keyword

end

class CKeywordable < ActiveRecord::Base
attr_accessible :conference_id, :keyword_id

belongs_to :conference
belongs_to :keyword
end

以下是模型：

class Industry < ActiveRecord::Base
attr_accessible :name, 
                :conferences_attributes,
                :i_keywordables_attributes, 
                :keywords,
                :keywords_attributes,
                :keyword_ids

validates       :name, presence: true
validates       :name, uniqueness: true

# Associations
has_many    :conferences
accepts_nested_attributes_for :conferences

#Keywords
has_many :i_keywordables
has_many :keywords, through: :i_keywordables
accepts_nested_attributes_for :i_keywordables
accepts_nested_attributes_for :keywords

end

class Keyword < ActiveRecord::Base

attr_accessible 
               :name, :profile_id, :active, :rating, 
               :c_keywordables_attributes,
               :i_keywordables_attributes,
               :industries_atributes

# Associations

#Industries
  has_many :i_keywordables
  has_many :industries, through: :i_keywordables
  accepts_nested_attributes_for :i_keywordables

#Conferences
  has_many :c_keywordables
  has_many :conferences, through: :c_keywordables
  accepts_nested_attributes_for :c_keywordables

end

class Conference < ActiveRecord::Base
attr_accessible 
              :name, :address1, :address2, :city, :email,
              :web, :profile_id, :state_id, :conference, 
              :description, :date_start, :date_end, :venue, :venue_web, 
              :organizer, :organizer_web, :c_keywordables_attributes, 
              :industry_attributes, :industry_id,
              :industry, :keyword_ids

# Associations

belongs_to :state
belongs_to :industry
accepts_nested_attributes_for :industry

#Keywords
has_many :c_keywordables
has_many :keywords, through: :c_keywordables
accepts_nested_attributes_for :c_keywordables

serialize :keywords, Array

  def to_s
     state_id
  end

end

这是会议/edit.html.erb

  <h2>edit <%= @conference.name %></h2>
        <%= form_for  @conference do |c| %>
            <%= c.label :name %>
            <%= c.text_field :name %>
            <%= c.label :address1 %>
            <%= c.text_field :address1 %>
            <%= c.label :address2 %>
            <%= c.text_field :address2 %>
            <%= c.label :city %>
            <%= c.text_field :city %>
            <%= c.label :state_id%>
            <%= c.collection_select :state_id, State.order(:name), :id, :name %>
            <%= c.label :email %>
            <%= c.text_field :email %>
            <%= c.label :web %>
            <%= c.text_field :web %>
       <hr width="80%">
            <%= c.label :industry_id %>
            <%= c.collection_select :industry_id, Industry.order(:name), :id, :name %>
      <br />
            <%= c.fields_for :industry, @industry do |ci| %>
             <%= ci.label :keyword_id %>
             <%= ci.grouped_collection_select :keywords, Industry.order(:name),
                :keywords, 
                :name, 
                :id, 
                :name, 
                {:include_blank => true}, { :multiple => true }
                 %>
       <% end %>
    <br />
<p><%= c.submit %></p>
<% end %>

这是会议控制器：

def edit
    @conference = Conference.find(params[:id])
end

def update
    @conference = Conference.find(params[:id])
        if @conference.update_attributes(params[:conference])
            redirect_to action: "all", notice: 'conference was successfully updated.'
        else
            render action: "edit" 
        end
end

视图呈现正常，但是当我提交更改时，出现错误。我看到的错误是：

无法为 ID=1 的会议找到 ID=3 的行业

以下是传递的参数：

{"utf8"=>"✓", "_method"=>"put", "authenticity_token"=>"k9fcAXF/iOXt3oVuTcxeDCaWOfE2PrVlBvFbQG8Mo/I=", "conference"=>{"name"=>"测试会议", " address1"=>"address 1", "address2"=>"address 2", "city"=>"City", "state_id"=>"38", "email"=>"test@example.com", "web"=>"www.example.com", "industry_id"=>"1", "industry_attributes"=>{"keywords"=>["", "6", "5"], "id"= >"3"}}, "commit"=>"更新会议", "action"=>"update", "controller"=>"会议”，“id”=>“1”}

4

2 回答 2

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I believe the problem is a collision between the following two statements in your Conference class:

class Conference
  ...

  has_many :keywords, through: :c_keywordables

  ...

  serialize :keywords, Array do
    ...
  end
end

The first reference to keywords is expecting to build an ActiveRecord association to the Keywords table while the second reference is expecting a db-backed attribute (column) named keywords which will hold a serialized (yaml) representation of array data. They're fighting over how to help you and you're the loser in the battle.

于 2013-11-07T21:40:08.543 回答
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@AndyV，我终于解决了这个问题。原来是我如何称呼协会的问题。我进入控制台以进一步调查我是如何与协会互动的。我想通过行业将关键字与会议相关联，这是错误的。所以因为我有：

 has_many :c_keywordables
 has_many :keywords, through: :c_keywordables

我可以直接调用关键字。所以在控制台中，我可以这样做：

 > c = Conference.first
 > c.keyword_ids
 > []
 > c.keyword_ids = [ 1, 2, 3 ]
 => [ 1, 2, 3 ]

所以我开始使用一个基本的复选框表单来尝试让事情发挥作用：

在 Railscast 的帮助下：

<% Keyword.all.each do |keyword| %>
  <p>
   <%= check_box_tag "conference[keyword_ids][]", keyword.id, @conference.keyword_ids.include?(keyword.id) %>
   <%= keyword.name %>
  </p>
<% end %>

它奏效了！现在我将回去尝试更复杂的形式，让它看起来像我想要的那样。

感谢所有的帮助。我很感激！

于 2013-11-19T18:13:21.527 回答