has_many ：通过不保存关联答案

【问题标题】：has_many :through not saving associationshas_many ：通过不保存关联
【发布时间】：2014-01-23 11:48:37
【问题描述】：

我已经关注这个LINK

但它不保存关联。

我的模特是：

class Shift < ActiveRecord::Base
      has_many :week_shifts, :dependent => :destroy
      has_many :weeks, :through => :week_shifts, :dependent => :destroy    
      accepts_nested_attributes_for :weeks
    end

    class Week < ActiveRecord::Base 
      has_many :week_shifts, :dependent => :destroy
      has_many :shifts, through: :week_shifts, :dependent => :destroy   
    end

    class WeekShift < ActiveRecord::Base  
      belongs_to :week
      belongs_to :shift
    end

而 _form 是：

  <% @weeks = Week.find(:all) %>
  <% @weeks.each do |week| %>
   <div class="field">
    <%= check_box_tag 'week_ids[]', week.id, @shift.weeks.include?(week) %>
    <%= week.day %>
   </div>
  <% end %>
  <%= hidden_field_tag 'week_ids[]', '' %>

输出是这样的

在布局/应用程序中渲染 shifts/edit.html.erb (109.3ms) 在 119 毫秒内完成 200 次 OK（查看次数：44.4 毫秒 | ActiveRecord：73.0 毫秒）在 2014-01-23 06:46:58 为 127.8.96.129 开始 PATCH "/shifts/3" -0500 由 ShiftsController#update 处理为 HTML 参数：{"utf8"=>"✓", "authenticity_token"=>"Ltd3Ln5YJcRf40wQiPeGC+rRVeeGTpU+X1pUGjxbN6M=", "shift"=>{"cod"=>"CN", "nome"=>"Centrale Notte", "descr"=>"Operator Centrale Notte", "stato"=>"1", "inizio(4i)"=>"00", "inizio(5i)"=>"00", "fine(4i)"=>"08", "fine(5i)"=>"00"}, "week_ids"=>["1", "2", "3", "4", ""], "commit"=>"更新班次", "id"=>"3"}

【问题讨论】：

标签： ruby ruby-on-rails-4 has-many

【解决方案1】：

看起来您需要为week_ids 限定表单的输入，以便它们构成shift 参数的一部分。目前它是这样发布的：

{
  "shift"=>{
    "cod"=>"CN",
    "nome"=>"Centrale Notte",
    "descr"=>"Operatore Centrale Notte",
    "stato"=>"1",
    "inizio(4i)"=>"00",
    "inizio(5i)"=>"00",
    "fine(4i)"=>"08",
    "fine(5i)"=>"00"
  },
  "week_ids"=>["1", "2", "3", "4", ""]
}

应该是这样的：

{
  "shift"=>{
    "cod"=>"CN",
    "nome"=>"Centrale Notte",
    "descr"=>"Operatore Centrale Notte",
    "stato"=>"1",
    "inizio(4i)"=>"00",
    "inizio(5i)"=>"00",
    "fine(4i)"=>"08",
    "fine(5i)"=>"00",
    "week_ids"=>["1", "2", "3", "4", ""]
  }
}

所以你的表单应该有这个：

<%= check_box_tag 'shift[week_ids][]', week.id, @shift.weeks.include?(week) %>

【讨论】：