如何通过我的 Rails 表单 create/remove 反对协会？

Question

我想 add/remove 从我的主表单对象 Report 记录到关联。我的多选下拉列表正确显示并将 ID 正确传递给我的更新操作。但是，我收到了以下消息。

Couldn't find all ReportExposures with 'id': (157504, 148644, 152852) (found 0 results, but was looking for 3)

现在我知道那些 ID 实际上是我的 ncaa_game_id 我想分配给 ReportExposure 记录，但我不能把 ReportExposure id 因为它还不存在。我需要对我的表单进行哪些调整才能使其正常工作，或者我是否需要在我的更新操作中添加一些代码来处理这些问题？

Report.rb

class Report < ActiveRecord::Base
  has_many :report_exposures
end

ReportExposure.rb

class ReportExposure < ActiveRecord::Base
  belongs_to :ncaa_game
  belongs_to :report
end

ReportsController.rb

def update

  # "report_exposure_ids"=>["157504","148644","152852"] -- these ids are really the ncaa_game_ids I want to create new report_exposure objects with...

  respond_to do |format|
    if @report.update(report_params)
      format.html
      format.json
    end
  end

end

_form.html.erb

<select id="report_report_exposure_ids" name="report[report_exposure_ids][]" class="multiselect-dropdownlist" multiple="multiple">
  <% @exposures.each do |season| %>
    <optgroup label="<%= season.first.season %> Season">
      <% season.includes(:home_team, :away_team).order(game_date: :asc).each do |game| %>
        <option value="<%= game.id %>"><%= game.full_description %></option>
      <% end %>
    </optgroup>
  <% end %>
</select>

Answer 1

将报告更改为：

class Report < ActiveRecord::Base
  has_many :report_exposures
  has_many :ncaa_games
  accepts_nested_attributes_for :ncaa_games
end

并在此处阅读有关执行嵌套表单的信息：

http://guides.rubyonrails.org/form_helpers.html#nested-forms

有很多关于 nested_forms 和 has_many through 关系的人提问的例子。查看这些以获取指导：

Rails has_many :through nested form

不要尝试操纵连接对象 (ReportExposure)，除非您实际上是在处理向该对象添加元数据的问题。这就是 ORM 的用途。

如何通过我的 Rails 表单 create/remove 反对协会？

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