nested_form 的问题，模型关联好几个层次答案

【问题标题】：Problems with nested_form, model associations several levels deepnested_form 的问题，模型关联好几个层次
【发布时间】：2012-02-21 17:22:26
【问题描述】：

我在使用nested_form 和simple_form 插件创建可以与以下域模型正常工作的嵌套表单时遇到问题。我认为我构造表单不正确或 attr_accessible 和 accept_nested_attributes_for 调用。

我有这个具有以下关联的域模型：

公司.rb

class Company < ActiveRecord::Base 
  has_one :subscription

  attr_accessible :name, :subscription_attributes, :cycles_attributes, :payments_attributes
  accepts_nested_attributes_for :subscription
end

订阅.rb

class Subscription < ActiveRecord::Base
    belongs_to: company
    has_many :cycles

    attr_accessible :company_id, :cycles_attributes, :payments_attributes
    accepts_nested_attributes_for :cycles
end

循环.rb

class Cycle < ActiveRecord::Base
    belongs_to :subscription
    has_many :payments

    attr_accessible :payments_attributes
    accepts_nested_attributes_for :payments
end

payment.rb

class Payment < ActiveRecord::Base

  belongs_to :cycle

end

我的看法如下：

<%= simple_nested_form_for company do |f| -%>
  <%= f.input :name %>

  <%= f.fields_for :subscription do |s| %>
  #assorted fields for subscription

    <%= s.fields_for :cycles do |c| %>
      #assorted fields for cycle
      <%= c.link_to_remove "[ - ] Erase Cycle"  %>

      <%= c.fields_for :payments do |p| %>
        #assorted fields for payments
        <%= p.link_to_remove "[ - ] Erase Payment"  %>
      <% end %>

      <%= c.link_to_add "[ + ] New Payment", :payments %>

    <% end %>
  <%=  s.link_to_add "[ + ] New Cycle", :cycles %>

<% end %>

公司控制人：

def new
  @company = Company.new
  @company.build_subscription

  @categories = Category.find(:all)

  respond_with @company
end

def create
  @company = Company.new(params[:company])

  if @company.save 
    flash[:notice] = "Success"
  else
    flash[:error] = "Error #{@company.errors.full_messages}"
  end

  respond_with @company
end

当然，我正在简化视图和内容，有一些验证和字段我没有显示，但这些都不是问题。当我提交表单时，我遇到了一些奇怪的错误，基本上所有信息都在参数中传递，但没有正确嵌套：/

Parameters: {"utf8"=>"✓", "authenticity_token"=>"57wgXJinL6kql0F9CxShKpf11RhdMfqXnb6y8K/pDg0=", 
"company"=>{"name"=>"asdf12",
  "subscription_attributes"=>{
    "cycles_attributes"=>{
      "0"=>{"plan_id"=>"1", "amount"=>"123", "months"=>"12", "_destroy"=>"false"}
    }, 
    "0"=>{
      "0"=>{
        "payments_attributes"=>{
          "new_1329843584974"=>{"payment_type"=>"Efectivo", "amount"=>"123", "receipt_number"=>"1231", "note"=>"asdf asdf", "_destroy"=>"false"
           }
        }
      }
    }
  }
}, "commit"=>"Save"}

WARNING: Can't mass-assign protected attributes: 0

错误是：

@messages={:"subscription.cycles.subscription"=>["can't be blank"],
           :"subscription.cycles.payments"=>["can't be blank"]}

属性传递给应用程序的方式出现了问题，我的猜测是，当我点击新的支付按钮时，它会在表单“外部”创建......有人遇到过类似的事情吗？

如果您需要更多信息，请告诉我。

【问题讨论】：

标签： ruby-on-rails ruby associations nested-forms

【解决方案1】：

问题出在nested_form 插件本身。

当有一个 has_one 关系并将嵌套模型作为其子级时，nested_form 在生成表单时遇到问题。

我检查了这个拉取请求并用更改修补了相应的文件

Issue #124 in the nested_form repo

the patch that fixes the issue

此代码最终应该合并到主仓库中。

【讨论】：