如何编辑模型及其与 form_for 的关系？

Question

我在 Rails 中使用 form_for-tag 时遇到问题。

我有以下型号：

节假日

   id      |   name
___________|_____________
   123     |   "asdf"
   345     |   "foo"
   757     |   "bar"

假期

   id      |   date
___________|_____________
   223     |   1998-03-11
   445     |   1999-06-21
   557     |   2009-09-20

国家

   id      |   name      |   country_code
___________|_____________|________________
   667     |   "italia"  |   "it"
   987     |   "france"  |   "fr"
   999     |   "austria" |   "au"

R_Countries

   id      |   country_id|   holiday_id
___________|_____________|________________
   463     |   667       |   123
   574     |   987       |   345
   687     |   999       |   757

R_Holidates

   id      |   holidate_id|   holiday_id
___________|______________|________________
   142     |   123        |   223
   253     |   345        |   445
   362     |   757        |   557

我想使用一个表单来创建一个假期，带有名称、日期和国家，所以这将是我的_form：

<%= form_for(@holiday) do |f| %>
  <% if @holiday.errors.any? %>
    <div id="error_explanation">
      <h2><%= pluralize(@holiday.errors.count, "error") %> prohibited this timespan from being saved:</h2>
      <ul>
      <% @holiday.errors.full_messages.each do |msg| %>
        <li><%= msg %></li>
      <% end %>
      </ul>
    </div>
  <% end %>


  <div class="field">
    <%= f.label :name %><br>
    <%= f.text_field :name %>
  </div>
  <div class="field">
    <%= f.label :holidate %><br>
    <%= f.date_select :holidate %>
  </div>
  <div class="field">
    <%= f.label :country_code %><br>
    <%= f.date_select :country_code %>
  </div>
  <div class="field">
    <%= f.label :country_name %><br>
    <%= f.text_field :country_name %>
  </div>

  <div class="actions">
   <%= f.submit %>
  </div>
<% end %>

但是，可以肯定的是，在执行脚本时，我得到了这个错误：

假期中的 NoMethodError#edit 显示 C:/xampp/htdocs/fluxcapacitor/app/views/holidays/_form.html.erb 其中第 20 行提出： #

的未定义方法“holidate”

---

编辑： 这是一个设计示例，它的外观：

---

编辑2： 我已经用我的种子文件填充了我的数据库，其中我使用了如下脚本：

from = Date.civil(2000,1,1)                                                         
to = Date.civil(2000,12,31)                                                             
Holidays.between(from, to, :any ).each do |date|                                    
    lname = date[:name]
    ldate = date[:date]
    lregion = date[:regions]
    Holiday.find_or_create_by(name:  lname)             #Holiday is created
    Holidate.find_or_create_by(date: ldate)                                                                                  #creates a Holidate
    RHolidate.find_or_create_by(holidate_id: Holidate.find_by(date: ldate).id, holiday_id: Holiday.find_by(name: lname).id)  #this should create a relation between the holiday and it's date
    ####
    lregion.each do |x|
        Country.create(country_code: x, name: x)
        if  !(RCountry.exists?(country_id: Country.find_by(country_code: x).id, holiday_id: Holiday.find_by(name: lname).id))
            RCountry.create(country_id: Country.find_by(country_code: x).id, holiday_id: Holiday.find_by(name: lname).id)
        end
    end

end 

Answer 1

我不确定您的代码，但您的表单可能看起来像（根据您的需要进行优化）：

<%= form_for(@holiday) do |f| %>
  ........some code about errors here....


 <%= fields_for :holydate, @holyday.holydate do |holydate| %>
   <%= holydate.date_select :holidate  %>
  <% end %>

  ........some other code here....

   <%= f.submit %>
<% end %>

---

或者有另一种使用标签并在创建/更新方法中调用它们的方法：

  <div class="field">
    <%= label_tag 'Date' %><br />
    <%= date_field_tag 'holidate' %>
  </div>
  <div class="field">
    <%= label_tag 'Countrycode' %><br />
    <%= text_field_tag :country_code %>
  </div>
  <div class="field">
    <%= label_tag 'Countryname' %><br />
    <%= text_field_tag 'country_name' %>
  </div>

这里也是控制器方法：

  def create
    @holiday = Holiday.new(holiday_params)
    e=Date.civil(d[:year].to_i,d[:month].to_i,d[:day].to_i)
    holidate=Holidate.where(:date => e).first_or_create
    RHolidate.where(:holidate_id => holidate.id, :holiday_id => @holiday.id ).first_or_create
    country=Country.where(:name => params[country_name], :country_code => params[country_code] ).first_or_create
    RCountry.where(:country_id => country.id, :holiday_id => @holiday.id ).first_or_create
    respond_to do |format|
      if @holiday.save
        format.html { redirect_to @holiday, notice: 'Holiday was successfully created.' }
        format.json { render action: 'show', status: :created, location: @holiday }
      else
        format.html { render action: 'new' }
        format.json { render json: @holiday.errors, status: :unprocessable_entity }
      end
    end
  end