Question

I am trying to apply some very basic logic to my view but am so far failing.

What I would like to do is return item.discount_price if there are the following conditions:

1. The item.product_id is equal to 1
2. The Cart.item.quantity count is equal or higher than 2.

Currently I have the following:

Items Model

class Item < ActiveRecord::Base
belongs_to :product
belongs_to :cart

def price_check

    if  Item.product_id = 1 && Item.quantity.count >= 2 
        return Item.discount_price
    else
        return Item.unit_price
    end 

end

end

View

<% for item in @cart.items %>
<tr class="<%= cycle :odd, :even %>">
  ...
  <td class="price"><%= gbp(item.price_check) %></td>
  ...
</tr>

The associations are as follows:

Cart - has_many :items
Items - Belongs_to :cart and :products
Products - has_ many :items

The error I keep receiving:

 NoMethodError in Carts#show

Showing C:/Sites/checkout/app/views/carts/show.html.erb where line #12 raised:

undefined method `quantity' for #<Class:0x50c3058>

Extracted source (around line #12):

9:        <tr class="<%= cycle :odd, :even %>">
10:       <td><%=h item.product.name %></td>
11:       <td class="qty"><%= item.quantity %></td>
12:       <td class="price"><%= gbp(item.price_check) %></td>
13:       <td class="price"><%= gbp(item.full_price) %></td>
14:       <td><%= button_to 'Remove', item, :method => :delete %></td>
15:       </tr>

app/models/item.rb:12:in `price_check'
app/views/carts/show.html.erb:12:in `block in _app_views_carts_show_html_erb___389237738_48997308'
app/views/carts/show.html.erb:8:in `_app_views_carts_show_html_erb___389237738_48997308'

Any help people can offer to fix this would be much appreciated! Thanks E

Answer 1

RadBrad had the right idea, but the wrong implementation

def price_check
  # Product Discount for Lavender Heart (Product code 001, greater than 2 in cart)        
  # Thought: Shouldn't you check to see if the name of the item is "Lavender Heart"?
  #          Checking if the product_id is 1 makes this test brittle
  if product_id == 1 && cart.items.quantity.count >= 2 
    discount_price
  else
    unit_price
  end 
end