Rails - Use fields_for to create multiple nested objects - ruby-on-rails

Question

Hoping someone can help out with this. I have two models order and date_order. Each order can have multiple date_orders, and I should be able to create many date_orders as I create an order.
How do I do that? As you can see, my code is working well for creating ONE date_order and relating it to the created order.
UPDATE: I have tried to create many "builders" in my orders/new file. It worked on the view, and created an order when I entered multiple dates and times. But the fields_for did not create any 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
order/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

Build more 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
Update:
Also, add content to your strong params whitelist.