ruby-on-rails - accepts_nested_attributes_for : What am I doing wrong

Question

我尝试在 rails4 中创建一对多连接。但是，虽然我没有收到错误消息，但未存储嵌套属性。

我究竟做错了什么？

站型

class Station < ActiveRecord::Base
    has_many :adresses

    accepts_nested_attributes_for :adresses
end

地址-型号

    class Adress < ActiveRecord::Base
        belongs_to :station
    end

Station-Controller
类 StationsController < ApplicationController

    def new
        @station = Station.new
        @station.adresses.build
    end

    def create
        @station = Station.new(station_params)
        @station.save
        redirect_to @station
    end

    def index
        @stations = Station.all
    end

private

    def station_params
        params.require(:station).permit(:name, adresses_attributes: [ :url ])
    end

end

站:new.html.erb

<%= form_for :station, url: stations_path do |station| %>
    <p>
        <%= station.label :name %><br />
        <%= station.text_field :name %>
    </p>
    <%= station.fields_for :adresses do |adress| %>
        <div class="field">
            <p>
                <%= adress.label :url %><br />
                <%= adress.text_field :url %>
            </p>
        </div>
    <% end %>
    <p>
        <%= station.submit %>
    </p>
<% end %>

[编辑]
我构建了这个问题的最小示例，并将其记录为此处的分步说明: https://groups.google.com/forum/#!topic/rubyonrails-talk/4RF_CFChua0

Answer 1

在 Rails 4 中，您还需要允许 id adresses 的属性.请这样做:

def station_params
    params.require(:station).permit(:name, adresses_attributes: [ :url, :id ])
end

我仍在尝试为此找到官方文档:(