Question

我有这些模特：

class Company < ActiveRecord::Base
  has_many :company_services, dependent: :destroy
  has_many :services, through: :company_services
  accepts_nested_attributes_for :services, :allow_destroy => true
end
class Service < ActiveRecord::Base
  has_many :company_services
  has_many :companies, through: :company_services
end
class CompanyService < ActiveRecord::Base
  belongs_to :company
  belongs_to :service
  validates_uniqueness_of :service_id, scope: :company_id
end

然后在控制器动作中：

  def new
    @company = Company.new
    @company.services.build
  end
  def create
    ...
    @company = Company.new(company_params)
respond_to do |format|
      if @company.save
        format.html { redirect_to edit_company_path(@company), notice: 'Company was successfully created.' }
        format.json { render action: 'show', status: :created, location: @company }
      else
        format.html { render action: 'new', notice: 'Company could not be saved.' }
        format.json { render json: @company.errors, status: :unprocessable_entity }
      end
    end
  end

  private
    params.require(:company).permit(:name, :email, ..., {:service_ids => [:id, :name, :label, :icon, :service_type]}).merge(latlng: geocode)

并查看：

<%= simple_form_for @company do |f| %>
  ...
  <%= f.association :services, 
                             as: :check_boxes, 
                             label_method: :label, 
                             value_method: :id,
                             item_wrapper_class: 'manage_services',
                             label: 'Services' %>
  ...
<% end %>

正确呈现复选框，当我保存表单时，不保存服务。我也试过了

{:service_ids => []}

在控制器的permit中，但是返回了此错误：

undefined method `name' for nil:NilClass

我昨天卡在这里仍然无法理解......我在SO上也发现了一些类似的话题，但没有一个对我有帮助。

我在这里错了什么？

提前谢谢。

修改这是我发送表格后得到的参数列表：

参数：{＆＃34; utf8＆＃34; =＆gt;＆＃34;✓＆＃34;，＆＃34; authenticity_token＆＃34; = GT;＆＃34; igyh4EBcdXT5b3rj / Zy52Mi27dh4u81GWCtUmGNCXw4 =＆＃34 ;, ＆＃34;公司＆＃34; =＆gt; {＆＃34; company_name＆＃34; =＆gt;＆＃34; 0＆＃34;，...，＆＃34; service_ids＆＃34; =＆gt; [＆＃ 34; 2＆＃34;，＆＃34; 7＆＃34;，＆＃34; 12＆＃34;，＆＃34; 17＆＃34;，＆＃34; 22＆＃34;，＆＃34; 27＆＃34;，＆＃34; 32＆＃34;，＆＃34;＆＃34;]，＆＃34; mc_num＆＃34; =＆gt;＆＃34; 3512616＆＃34;，＆＃34; dot_num＆＃34; =＆gt;＆＃34; 126126＆＃34;， ...}，＆＃34;提交＆＃34; =＆gt;＆＃34;更新＆＃34;}

Rails 4 - 不保存嵌套属性

0 个答案: