I'm new to rails so I apologize for my ignorance in advance... I'm
working through a tutorial here but I think it may be written for a
slightly older version of rails. Trying to make a store app.
I'm getting the following error (with application trace shown):
ArgumentError in StoreController#add_to_cart
wrong number of arguments (1 for 0)
RAILS_ROOT: script/../config/..
Application Trace | Framework Trace | Full Trace
app/models/cart.rb:13:in `initialize'
app/models/cart.rb:13:in `new'
app/models/cart.rb:13:in `add_product'
app/controllers/store_controller.rb:10:in `add_to_cart'
/Library/Ruby/Gems/1.8/gems/mongrel-1.1.5/lib/mongrel/rails.rb:76:in
`process'
/Library/Ruby/Gems/1.8/gems/mongrel-1.1.5/lib/mongrel/rails.rb:74:in
`synchronize'
/Library/Ruby/Gems/1.8/gems/mongrel-1.1.5/lib/mongrel/rails.rb:74:in
`process'
/Library/Ruby/Gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:159:in
`process_client'
/Library/Ruby/Gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:158:in `each'
/Library/Ruby/Gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:158:in
`process_client'
/Library/Ruby/Gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:285:in `run'
/Library/Ruby/Gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:285:in
`initialize'
/Library/Ruby/Gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:285:in `new'
/Library/Ruby/Gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:285:in `run'
/Library/Ruby/Gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:268:in
`initialize'
/Library/Ruby/Gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:268:in `new'
/Library/Ruby/Gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:268:in `run'
/Library/Ruby/Gems/1.8/gems/mongrel-1.1.5/lib/mongrel/configurator.rb:282:in
`run'
/Library/Ruby/Gems/1.8/gems/mongrel-1.1.5/lib/mongrel/configurator.rb:281:in
`each'
/Library/Ruby/Gems/1.8/gems/mongrel-1.1.5/lib/mongrel/configurator.rb:281:in
`run'
/Library/Ruby/Gems/1.8/gems/mongrel-1.1.5/bin/mongrel_rails:128:in `run'
/Library/Ruby/Gems/1.8/gems/mongrel-1.1.5/lib/mongrel/command.rb:212:in
`run'
/Library/Ruby/Gems/1.8/gems/mongrel-1.1.5/bin/mongrel_rails:281
Now I *think* this means that I have a problem with my
store_controller.rb file, which looks like this:
class StoreController < ApplicationController
def index
@products = Product.find_products_for_sale
end
def add_to_cart
@cart = find_cart
product = Product.find(params[:id])
@cart.add_product(product)
end
private
def find_cart
session[:cart] ||=Cart.new
end
end
But, I'm not sure - and it does seem a bit strange that that would be
where the error originates from as I didn't change anything in this file
from when it was working to when I got the error.
What I did do was create a model called cart_item.rb:
class CartItem
attr_reader :product, :quantity
def initialize
@product = product
@quantity = 1
end
def increment_quantity
@quantity += 1
end
def title
@product.title
end
def price
@product.price * @quantity
end
end
And edited the cart.rb model to include a more robust add_product, it
now looks like this:
class Cart
attr_reader :items
def initialize
@items = []
end
def add_product(product)
current_item = @items.find {|item| item.product == product}
if current_item
current_item.increment_quantity
else
@items << CartItem.new(product)
end
end
end
I had it pointed out to me that the line;
current_item = @items.find {|item| item.product == product}
Should be;
current_item = @items.detect {|item| item.product == product}
But this didn't result in any change... would REALLY appreciate any
insight!
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