Rails - 使用 fields_for 创建多个嵌套对象

Question

希望有人可以帮助解决这个问题。我有两个模型 order 和 date_order。每个订单可以有多个 date_orders，我应该可以在创建订单时创建多个 date_orders。

我该怎么做？如您所见，我的代码在创建 ONE date_order 并将其与创建的订单相关联方面运行良好。

更新：我尝试在我的订单/新文件中创建许多“构建器”。它适用于视图，并在我输入多个日期和时间时创建了一个订单。但是 fields_for 没有创建任何 date_orders。

orders_controller.rb

def new
    @order = Order.new
    @order.date_orders.build
end

def create
    @order = Order.new(order_params)
    if @order.save
        flash[:success] = "blah"
        redirect_to @order
    else
        render 'new'
    end
end

private

def order_params
    params.require(:order).permit(:user_id, :purpose, 
    date_orders_attributes: [:id, :order_date, :time_start, :time_end, :order_id])
end

order.rb

class Order < ActiveRecord::Base

     has_many :date_orders, :dependent => :destroy
     accepts_nested_attributes_for :date_orders, :reject_if => lambda { |a| a[:content].blank? }, :allow_destroy => true
end

date_order.rb

class DateOrder < ActiveRecord::Base
    belongs_to :order
end

订单/new.html.erb

<%= form_for(@order, :html => {:multipart => true}) do |f| %>
    ## SOME QUESTIONS ##
    <%= f.fields_for :date_orders do |builder| %>
        <%= builder.label :date %>
        <%= builder.date_field :order_date %>

        <%= builder.label :starting_time %>
        <%= builder.time_field :time_start %>

        <%= builder.label :ending_time %>
        <%= builder.time_field :time_end %>

    <% end %>
<% end %>

Answer 1

构建更多orders_dates:

class OrdersController < ApplicationController
    def new
        @order = Order.new
        5.times { @order.date_orders.build }   # < === HERE ===
    end

    private

    def order_params
        params.require(:order).permit(:user_id, :purpose, 
        #                                 |-  === HERE ===
        date_orders_attributes: [:id, :content, :order_date, :time_start, :time_end, :order_id])
    end
end

更新：

另外，将content 添加到您的强参数白名单中。