Rails ArgumentError in OrdersController#new validation - ruby-on-rails

Question

Second question on here, I'd really like to solve this one myself but I just don't know where to start to debug it.
So here is my error in the browser (which occurs when I go to check out and enter my details in order/_form.html.erb)
ArgumentError in OrdersController#new
You need to supply at least one validation
Rails.root: C:/Users/Ruby/rails_practice/depot4
Application Trace | Framework Trace | Full Trace
app/models/payment_type.rb:6:in <class:PaymentType>'
app/models/payment_type.rb:1:in'
app/models/order.rb:7:in <class:Order>'
app/models/order.rb:1:in'
app/controllers/orders_controller.rb:1:in `'
And here is my def new in OrdersController:
def new
#cart = current_cart
if #cart.line_items.empty?
redirect_to store_url, :notice => "Your cart is empty"
return
end
#hide_checkout_button = true
#order = Order.new
respond_to do |format|
format.html # new.html.erb
format.json { render json: #order }
end
end
The thing is that I haven't touch def new, I've been working on def create, which is here:
def create
#order = Order.new(params[:order])
#order.add_line_items_from_cart(current_cart)
#cart = current_cart
#hide_checkout_button = true
pay_type = PaymentType.find( :conditions => ['pay_type = ?', #order.pay_type] )
#order.payment_type_id = pay_type.id
respond_to do |format|
if #order.save
Cart.destroy(session[:cart_id])
session[:cart_id] = nil
format.html { redirect_to(store_url, :notice => 'Thank you for your order.') }
format.json { render json: #order, status: :created, location: #order }
else
format.html { render action: "new" }
format.json { render json: #order.errors, status: :unprocessable_entity }
end
end
end
What I am trying to do there is create an order which is which belongs_to a payment_type and has_many line_items which belongs_to a cart.
Incidentally, I am also trying to hide_checkout_button with an instance variable when I am on the order page.
The Orders table has a foreign key to the PaymentTypes table and I am trying to find the correct id from this PaymentTypes table for the payment_type submitted by the user.
If I comment out these two lines:
pay_type = PaymentType.find( :conditions => ['pay_type = ?', #order.pay_type] )
#order.payment_type_id = pay_type.id
Sometimes I get a different error:
NoMethodError in OrdersController#new
undefined method `key?' for nil:NilClass
I think this is to do with incorrect caching in the browser but I'm not sure what the connection is.
I will update with the rest after I post this first
Part deux
I know that this is about validation, but I can't see what I am doing wrong... order.rb:
class Order < ActiveRecord::Base
attr_accessible :address, :email, :name, :pay_type, :payment_type_id, :cart_id,
:product_id
has_many :line_items, :dependent => :destroy
belongs_to :payment_type
PAYMENT_TYPES = PaymentType.pluck(:pay_type)
validates :name, :address, :email, :pay_type, :presence => true
validates :pay_type, :inclusion => PAYMENT_TYPES
And then you've got the other side of that belongs_to in payment_type.rb
class PaymentType < ActiveRecord::Base
attr_accessible :pay_type
has_many :orders
validates ***:pay_type,*** :uniqueness
end
I know that I am totally just confusing things but I have one fail in the functionals tests and one error that has something to do with updating an order but I don't know what yet. I am going to work on them to see if by solving them I inadvertently solve this weird error.
If anyone can give me tips on hacking and debugging in rails that would be great. I would love to be able to solve this without typing all of this in here.
I don't think the server trace gives any more information than the browser window in this case but if you need it, or anything else please ask.
UPDATE:
So my problem is that I know how to solve it with a global variable in payment_type.rb, but this means that I have one column of payment types in the Orders table and another of names and payment_type_ids in another column, which is the foreign key.
Since I have the foreign key I shouldn't need a specific column for payment_types in the Orders table. I should just be able to see the value from the PaymentType table in the Orders view.
How do you do this without a Global variable?
UPDATE deux:
Ok, so I never posted this before (from orders_form.html.erb):
26: <div class="field">
27: <%= f.label :pay_type %><br />
28: <%= f.select :pay_type, PaymentType::PAYMENT_TYPES,
29: :prompt => 'Select a payment method' %>
30: </div>
31: <div class="actions">
So I've tried to select for :pay_type in Orders but given options from :pay_type in PaymentTypes.
I can't imagine that matters does it? Seems to be where my problem lies, but can't be sure.

Answer 1

I think the syntax of your validate inclusion of is wrong. It should be something like:
validates :pay_type, :inclusion => { :in => PAYMENT_TYPES }