Monday, February 18, 2008

AWDR depot app for Rails 2.0 (RubyPlus.org) - Part 2

Here goes part 2.

I've finished the screencasts for chapter 8, 9, and 10.

Here are the problems I came across while doing so:

At the beginning of chapter 8, the top of the screen is cut off when creating sessions in the database, the is the whole line:

  rake db:sessions:create


And then towards the beginning of chapter 10, a line is cut off in 005_create_line_items.rb

  t.decimal :total_price, :null => false, :precision => 8, :scale => 2


I had some trouble with the ajax highlight effect in add_to_cart.js.rjs

  page[:current_item].visual_effect :highlight, 
        :startcolor => "#88ff88", 
        :endcolor => "#114411"


and was not able to figure it out. When I clicked Add to Cart, I would get the error "TypeError: $("current_item") has no properties" and then another popup window with a lot of code in it. I looked around the internet for a while trying to get it fixed, but nothing I tried worked. If anyone figures this out, let me know. I ended up commenting out that line in add_to_cart.js.rjs.

Everything else works great. I really like Bala's screencasts, they are a great resource for learning Rails 2.0. After finishing them, I believe I know enough to make something that is not too complicated. For my next post, I believe I am going to start working on a forum in Rails, and AJAX it up(I could use a lot more experience with AJAX).

See you all next time!
at

5 comments:

  1. AnonymousApril 17, 2008 at 7:41 PM

    I got the same error. I found out that I forgot to modify app/models/cart.rb

    to what's on page 132 (AWDROR 2nd Ed)

    My cart.rb was still like page 110.

    @items << CartItem.new(product)

    needs to modify to:

    current_item = CartItem.new(product)
    @items << current_item

    otherwise the current_item returned is nil.


    HTH

    ReplyDelete
  2. AnonymousMay 18, 2008 at 8:42 AM

    I made the same mistake as yours. The code transition from @items << CartItem.new(product) to @items << current_item was simply not apparent in the book

    ReplyDelete
  3. Mortimer Agustus StanleyMay 14, 2009 at 7:18 PM

    using 3rd edition, so will not cite pages.

    My app/models/cart.rb is

    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
    current_item = CartItem.new(product)
    @items << CartItem.new(product)
    end
    current_item || @items[0]
    end

    def total_price
    @items.sum{|item| item.price}
    end

    end


    I'm seeing the same pair of error windows ... but only the 1st time a product is added to the cart. Add the same product to the cart a 2nd time, and all works as expected.

    I haven't yet figured it out.

    Thanks

    ReplyDelete
  4. Hack_AWAJune 5, 2009 at 5:38 PM

    I found this same solution at the AWDR official website but it did not work for me.
    I'm still getting RJS error: TypeError: $("current_item") is null

    Here is my code for cart.rb, which is exactly the same as above:

    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
    current_item || @items[0]
    end

    ReplyDelete
  5. kamagraMay 4, 2011 at 12:10 PM

    Thanks for this one, I was looking for this information for quite some time.

    ReplyDelete