Strange error in rails while sending notification email - ruby-on-rails

Question

I am trying to send a notification email to the email provided by the user when he clicks the place order button but i get this error
TypeError: no implicit conversion of Symbol into Integer
and the error is in order_controller.rb file here it is
class OrdersController < ApplicationController
def create
#order_form=OrderForm.new(user: User.new(order_params[:user]),cart: #cart)
if #order_form.save
notify_user
redirect_to root_path,notice:"Thank You for placing the order sir."
else
render "carts/checkout"
end
end
private
def notify_user
OrderMailer.order_confirmation(#order_form.order).deliver
end
def order_params
params.require(:order_form).permit(
user:[:name,:phone,:address,:city,:country,:postal_code,:email])
end
end
and this is the order_form.rb model
class OrderForm
include ActiveModel::Model
attr_accessor :user,:order
attr_writer :cart
def save
set_password_for_user
if valid?
persist
true
else
false
end
end
def has_error?
user.errors.any?
end
private
def valid?
user.valid?
end
def persist
user.save
#order=Order.create!(user:user)
build_order_items
end
def set_password_for_user
user.password="examplepassword"
end
def build_order_items
#cart.items.each do |item|
#order.order_items.create! product_id: item.product_id, quantity: item.quantity
end
end
end
and finally my order_mailer.rb mailer
class OrderMailer < ActionMailer::Base
default from: "bobbyverma946#yahoo.in"
def order_confirmation order
#order=order
mail to: order.user.email, subject: "Your order (##{order.id})"
end
end
can someone please tell me whats wrong with the code because i am really confused