[英]Quantity in Cart Model Basic Logic Ruby on Rails
我正在嘗試將一些非常基本的邏輯應用於我的觀點,但到目前為止卻失敗了。
如果存在以下情況,我想返回item.discount_price:
目前,我有以下內容:
項目型號
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
結束
視圖
<% for item in @cart.items %>
<tr class="<%= cycle :odd, :even %>">
...
<td class="price"><%= gbp(item.price_check) %></td>
...
</tr>
關聯如下:
Cart - has_many :items
Items - Belongs_to :cart and :products
Products - has_ many :items
我不斷收到的錯誤:
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'
人們可以提供任何幫助解決此問題的幫助! 謝謝E
RadBrad的想法正確,但實現錯誤
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
第一個明顯的問題是:
if Item.product_id = 1 && Item.quantity.count >= 2
您要求調用CLASS方法product_id。 您需要實例方法,即
if @item.product_id == 1 && @item.quantity >= 2
通常在此之前:
@item = Item.find(params[:id])
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