Ruby on Rails-在另一个模型的表单上添加模型的字段

问题描述

我有两个模型合同和附录。合约 has_many：附录和附录属于：contract

I have two models Contract and Addendum. Contract has_many :addendums and Addendum belongs_to :contract

创建新合同时，将自动创建一个新的附录，但是需要一些附加的元素来创建新的附录。如何在合同的窗体上添加字段 value ，该字段是附录的属性，而不是合同的属性？

When a new Contract is created, automatically will create a new Addendum but some aditional elements are needed to create the new Addendum. How can I add a field value, which is an attribute from Addendum but not from Contract, on the Contract's form?

推荐答案

您正在寻找的是嵌套表格，这在RoR中很常见。有关嵌套和复杂表单的更多信息，Rails指南的。我建议您查看所有，这些指南在学习框架时非常有用。

What you're looking for is a nested form, which is pretty common in RoR. For more information on nested and complex forms, there's a section of a Rails Guide for that. I'd recommend checking out all of the Rails Guides, which are incredibly helpful when learning the framework.

对于您的特定问题，首先将您的合同模型告诉 accept_nested_attributes_for 您的附录模型。

For your specific question, first tell your Contract model to accept_nested_attributes_for your Addendum model.

class Contract < ActiveRecord::Base
  has_many :addendum
  accepts_nested_attributes_for :addendums
end

接下来，打开您的合同控制者，然后做两件事。一种，在制作新的合约时建立附录。第二，在 contract_params 方法中允许附录（假设您使用的是rails 4）的嵌套属性。

Next, open up your contract controller, and do two things. One, build an addendum when making a new contract. Two, allow the nested attributes of addendums (assuming you're using rails 4) in your contract_params method.

class ContractController < ApplicationController
  def new
    @contract = Contract.new
    @addendum = @contract.addendums.build
  end

  protected
    def contract_params
      params.require(:contact).permit(:field1, :field2, addendums_attributes: [:id, :value, :other_field])
    end
end

最后，在合同中添加 forms_for 助手的表单。

Last, add the forms_for helper in your contracts form.

<%= form_for @contract do |f| %>

  <!-- contract fields -->

  Addendums:
  <ul>
    <%= f.fields_for :addendums do |addendums_form| %>
      <li>
        <%= addendums_form.label :value %>
        <%= addendums_form.text_field :value %>

        <!-- Any other addendum attributes -->

      </li>
    <% end %>
  </ul>
<% end %>

有了这一点，您应该已经准备就绪！祝您编程愉快！

With that, you should be all set! Happy coding!

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