Simple form not submitting to database - ruby-on-rails

Question

I'm building a simple online shop for practice and want to track order histories, at the moment I'm getting the user to submit but the shipping address and order history, later I'll upgrade order history to be a hidden field.
The problem is that I can't get the simple form to submit anything to my database.
My form looks like this:
<p class="text-center">
congratulations your order is almost complete, please fill out the form below to place your order or <%= link_to "browse other products.", root_path %>
</p>
<%= simple_form_for #placeorder, html: { multipart: true } do |f| %>
<%= f.error_notification %>
<div class="form-inputs" >
<%= f.input :shipping_address, label: false, placeholder: 'Shipping address', input_html: { class: 'input-lg', required: true } %>
<%= f.input :order_history, label: false, placeholder: 'order_history', input_html: { class: 'input-lg', required: true } %>
</div>
<div class="form-actions">
<%= f.button :submit, "Confirm order" %>
</div>
<% end %>
My place order controller looks like this:
class PlaceOrdersController < ApplicationController
def new
current_order.order_items.each do |order_item|
#last_item_name = order_item.product.name
end
#placeorder = PlaceOrder.new
#order = current_order.order_items
end
def create
#placeorder = PlaceOrder.create(place_order_params)
p "HELLO #{#placeorder}"
if #placeorder.save
flash[:success] = "You've made your order"
redirect_to root_path
else
flash[:alert] = "Something went wrong, check the form and submit your order again"
render :new
end
end
private
def place_order_params
params.require(:place_order).permit(:shipping_address, :order_history)
end
end
My routes.rb looks like this:
Rails.application.routes.draw do
resources :products
resources :checkout
resources :place_orders
resource :cart, only: [:show]
resources :order_items, only: [:create, :update, :destroy], defaults: { format: 'js' }
root to: "products#index"
devise_for :users, :controllers => { registrations: 'registrations' }
end
I have other forms that are working fine and they look the same. Any help would be greatly appreciated.