nested_attributes（has_many：手机）的表格

Question

联系模特

class Contact < ActiveRecord::Base
    belongs_to :phonebook
    has_many :mobiles
    accepts_nested_attributes_for :mobiles
end

手机模型

class Mobile < ActiveRecord::Base
    belongs_to :contact
end

联系人控制器

def new
    @contact = Contact.new
end

注：

移动模型具有详细信息和类型作为属性。
联系人模型将名称作为属性。

如何使用 rails 帮助器编写表单来为新的联系人实例生成多个移动对象？

这是我的表格

<h1>Create a new Contact</h1>
<h2>Add details</h2>
<% form_for(@contact) do |f| %>
    <%= f.error_messages %>
    <div class="field">
        <%= f.label :name %><br />
        <%= f.text_field :name %>
    </div>
    <div class="field">
        <%= f.label :mobile %><br />
        <% f.fields_for :mobile do |ff| %>
            <div>
                <%= ff.select :type,options_for_select([["HOME", "H"], ["WORK", "W"],["OTHER", "O"]])%>
                <%= ff.text_field :details %>
            </div>
        <% end %>
    </div>
    <div class="actions">
        <%= f.submit "Add Contact" %>
    </div>
<% end %>

Answer 1

看看here。您的控制器中需要这样的东西：

def new
    @contact = Contact.new
    2.times { @contact.mobiles.build}
end

关于 build 的解释可以在 API docs:

中找到

build(attributes = {}, &block) Link

Returns a new object of the collection type that has been instantiated with attributes and linked to this object, but have not yet been saved. You can pass an array of attributes hashes, this will return an array with the new objects.

更新

如果您想动态添加字段，请查看：

Adding dynamic fields to nested form through AJAX
https://github.com/lailsonbm/awesome_nested_fields

nested_attributes（has_many：手机）的表格

Forms for nested_attributes (has_many: mobiles)

ruby-on-rails

ruby-on-rails-3