Rails 4 trouble with accepts_nested_attributes_for - ruby-on-rails

Question

I am new to rails and I'm trying the accepts_nested_attributes_for function. I am creating an inventory system and the accepts_nested_attributes_for feature is being used to attach multiple order details to an order. An order must also be associated with store location.
The problem I'm having is the order is being created but no data is being passed to the order details table.
My views are below:
Orders View
<h1>Place An Order</h1>
<%= form_for ([#location, #order]) do |f| %>
<p>
<%= f.label :customer_id %><br />
<%= f.text_field :customer_id %>
</p>
<p>
<h3>Items</h3>
<%= f.fields_for :order_details do |builder| %>
<%= render 'order_detail_fields', :f => builder %>
<% end %>
</p>
<p><%= link_to_add_fields "Add Item", f, :order_details %></p>
<p>
<%= f.submit %>
</p>
<% end %>
Order_details_fields Partial
<p class="fields">
<%= f.label :item_id %><br />
<%= f.text_field :item_id %></br>
<%= f.label :quantity %></br>
<%= f.text_field :quantity %></br>
<%= f.label :cost %></br>
<%= f.text_field :cost %></br>
<%= f.label :discount %><br />
<%= f.text_field :discount %><br />
<%= f.hidden_field :_destroy %>
<%= link_to_function "remove", "remove_fields(this)" %>
</p>
Orders Controller
class OrdersController < ApplicationController
def index
#orders = Order.all
end
def show
#order = Order.find(params[:id])
end
def new
#order = Order.new
#location = Location.find(params[:location_id])
end
def create
#location = Location.find(params[:location_id])
#order = #location.orders.create(order_params)
##order = #order.order_details.create
if #order.save
redirect_to #order
else
render :action => 'new'
end
end
private
def order_params
params.require(:order).permit(:customer_id, order_detials_attributes: [:id, :item_id, :quantity, :cost, :discount])
end
end
Orders Model
class Order < ActiveRecord::Base
belongs_to :location
has_many :order_details, :dependent => :destroy
accepts_nested_attributes_for :order_details, :reject_if => lambda { |a| a[:content].blank? }, :allow_destroy => true
end
Order Details Model
class OrderDetail < ActiveRecord::Base
belongs_to :order
end
Routes
resources :locations do
resources :orders
end
resources :orders do
resources :order_details
end
Any help with this would be greatly appreciated

Answer 1

Build
Looks like everything is right to me - the only problem being the issue #Pavan outlined, which is that when you use accepts_nested_attributes_for, you have to build the associative object, so it can be used in the form:
#app/controllers/orders_controller.rb
Class OrdersController < ApplicationController
def new
#location = Location.find parmas[:id]
#order = Order.find params[:id]
#order.order_details.build
end
end
Although this looks like the only issue you have, there may be other problems (validation on the OrderDetail model as an example (which you don't have)
The only issue with what both I and Pavan have recommended is if you don't build your associative data, the fields_for don't show on the form. If your fields are showing, it may be a different issue, which will be highlighted in the params hash