Undefined Method error

Rails
1

OK. I have 4 models, item/category/subcategory/brand

association like following

item
belongs_to :brands
belongs_to :categories
belongs_to :subcategories

brand
has_many :items

category
has_many :items
has_many :subcategories

subcategory
has_many :items
belongs_to :category

I also have “category_id”, “brand_id”, “subcategory_id” as integer, in
@items

I have following in item/index view

<% for item in @items %>
<%=h item.category.category_name %>
<%=h item.brand.brand_name %>

I got undefined method “category” error message, but no error message
for “brand”

In rails console, I tried like following

c=Item.find(:first)
c.brand.brand_name
above I can got the brand_name correctly. But

c.category.category_name
I got same error message "undefined method ‘category’ "

Why would this happen?

2

On 28 Dec 2008, at 17:04, Daniel wrote:

OK. I have 4 models, item/category/subcategory/brand

association like following

item
belongs_to :brands
belongs_to :categories
belongs_to :subcategories

belongs_to should be singular

Fred

3

Hi Fred,
Sorry that’s my fault.
in my code actually it’s singular. Because “brand” part works fine :slight_smile:

item
belongs_to :brand
belongs_to :category
belongs_to :subcategory