P125 - error on clicking 'add to cart' btn

I get:

NameError in Line itemsController#create

undefined local variable or method `product_id’ for #

app/controllers/line_items_controller.rb:45:in `create’

Not sure where I’ve gone wrong. Any ideas?

Many thanks, s.

On page 124, you added a line to the line_items_controller. That line is supposed to reference the id attribute of the product you just found. Perhaps instead of typing product.id (with a dot), you entered product_id (with an underscore)?

Ahh! ... Thanks for your time Sam.

s.

Hi Sam,

Loving the book so far, but just got stuck on page 121 of b5_0.pdf

Similarly to the previous post:
When I click on my new “Add to Cart” button, I get the following error:

ArgumentError in Line itemsController#create

wrong number of arguments (0 for 1)
Rails.root: /Users/dstys/Sites/work/depot

Application Trace | Framework Trace | Full Trace
app/models/cart.rb:2
app/controllers/application_controller.rb:7:in `current_cart’
app/controllers/line_items_controller.rb:51:in `create’
Request

Parameters:

{“product_id”=>”2”, “authenticity_token”=>”NnhbaGSOoKuJsEn0ccGUHbJp/vclIv4vFz7t/MOGGCo=”}
Show session dump

Any help would be fantastic – thanks!

Dave

Aha!
Finally – comparing enough files to your source, I found my problem…

I had the following typo in my cart model… has_many :line_items, :dependent => destroy

Which needs to be: has_many :line_items, :dependent => :destroy

(Notice, the ”:” was missing at my destroy dependency…)

Thanks—I’m enjoying your book tremendously. I’m VERY new to Ruby and new to Rails, but I’m catching on fairly quickly. The book is easy to follow.

Dave

Thank you David Stys. I made the exact mistake… couldn’t figure it out for days… the error message certain didn’t help…

Wow! David, I just pulled my hair out for the last 2 hours trying to figure this out. Glad I found your comment.