Error in Verification posted by Federico Gonzalez Lutteroth @ Sat, 10 May 2008 20:28:29 -0000

Federico Gonzalez Lutteroth — Sat, 10 May 2008 20:28:29 -0000

Hi,

I implemented the solution for receiving IPN’s in the website payments standard option. Everything was working fine when I was testing with the sandbox, but when i tryied to comunicate with the real server i get a “Errno::ECONNRESET (Connection reset by peer):” error, when doing the verification.

Here is the code:


  def ipnConfirm
    uri = URI.parse("https://www.paypal.com/cgi-bin/webscr")
    status = nil
    Net::HTTP.start(uri.host, uri.port) do |request|
        status = request.post(uri.path, @raw + "&cmd=_notify-validate").body
    end
    logger.debug "status = '#{status}'" 
    status == "VERIFIED" 
  end

The error is stated as being on lines 4 and 5. (the Net:HTTP line, and the next one.) Could this be because i don’t have a SSL certificate?

thanks.

Updating the Image link to add_to_cart for AJAX (pg 130) posted by Scott Gardner @ Fri, 09 May 2008 21:08:11 -0000

Scott Gardner — Fri, 09 May 2008 21:08:11 -0000

Replying to my own topic to report a problem with degrading this functionality when JS is turned off (pg 138). As it stands, using the code I posted above, clicking on the image with JS off does nothing.

Why is that? It’s calling the same action, so the request.xhr? conditional should work the same as clicking the Add to Cart button, right?

I tried refactoring the link as follows, which I got to work but the display got fouled up and my initial attempts to fix the CSS didn’t work (e.g., display: inline;, wrapping it in a new div class, etc.).


<% form_remote_tag :url => {:action => :add_to_cart, :id => product} do %>
    <%= image_submit_tag(product.image_url) %>
<% end %>

Is this the correct approach (and thus I just need to fix my CSS), or is there a better way?

Pagination posted by Dave Thomas @ Fri, 09 May 2008 17:17:25 -0000

Dave Thomas — Fri, 09 May 2008 17:17:25 -0000

will_paginate seems to be the definite winner in this area, and it’s easy to use…

Updating the Image link to add_to_cart for AJAX (pg 130) posted by Scott Gardner @ Fri, 09 May 2008 17:05:01 -0000

Scott Gardner — Fri, 09 May 2008 17:05:01 -0000

The end of lesson assignments previously had us make the image a link to add_to_cart. Once you switch over to using an Ajax cart, your link will no longer work. Here’s my code to update that link:

depot/app/views/store/index.html.erb


<%= link_to_remote image_tag(product.image_url), :url => {:action => 'add_to_cart', :id => product} %>

Chapter 10.1 - Foreign key constraints with SQLite? posted by Arthur Blair @ Fri, 09 May 2008 16:56:33 -0000

Arthur Blair — Fri, 09 May 2008 16:56:33 -0000

Indeed, the process of looking up foreign keys in sqlite myself scared me sufficiently to give up and ask here instead. I’ll see if I can get it to work myself, and look forward to the next beta.

Thanks for your rapid response.

SQL Server posted by Jason Waters @ Fri, 09 May 2008 16:50:58 -0000

Jason Waters — Fri, 09 May 2008 16:50:58 -0000

Anyone use rails with SQL Server?

Depot: the admin controller and scaffold posted by Jaime Bellmyer @ Fri, 09 May 2008 16:29:53 -0000

Jaime Bellmyer — Fri, 09 May 2008 16:29:53 -0000

Thanks, Sam – now that you mention it, I do remember the note about images. thanks!

Depot: the admin controller and scaffold posted by Jaime Bellmyer @ Fri, 09 May 2008 16:28:40 -0000

Jaime Bellmyer — Fri, 09 May 2008 16:28:40 -0000

Another note: on page 87 of the PDF, footnote #14 is a link to http://media.pragprog.com/titles/rails3/code/depot_c/public/images, which fails with a 403 error.

Depot: the admin controller and scaffold posted by Sam Ruby @ Fri, 09 May 2008 16:27:19 -0000

Sam Ruby — Fri, 09 May 2008 16:27:19 -0000

I mention in the preface to the third edition that the images have not yet been updated, but the name of the controller clearly is an error. I’ll make sure that that error is corrected in the next beta. Thanks!

Chapter 10.1 - Foreign key constraints with SQLite? posted by Sam Ruby @ Fri, 09 May 2008 16:21:17 -0000

Sam Ruby — Fri, 09 May 2008 16:21:17 -0000

My apologies, I’ll make sure that that will be fixed in the next beta.

Foreign keys are a bit more involved with sqlite3. I’m thinking of deferring this to late in chapter 16.

Depot: the admin controller and scaffold posted by Jaime Bellmyer @ Fri, 09 May 2008 16:07:32 -0000

Jaime Bellmyer — Fri, 09 May 2008 16:07:32 -0000

To editing staff:

This has probably already been reported, but I couldn’t find it. There are a couple typos. On page 76 of the PDF (v3, B1.0) it tells the reader to enter the controller, all lowercase, into the browser address bar. But it lists “product” as the controller, when it’s actually “products”, plural.

Second, all the example images show admin as the controller in the address bar, which is leftover from the previous version of the book.

Thanks for a great book!

Chapter 10.1 - Foreign key constraints with SQLite? posted by Arthur Blair @ Fri, 09 May 2008 16:03:08 -0000

Arthur Blair — Fri, 09 May 2008 16:03:08 -0000

Page 141 uses MySQL statements to specify the foreign key constraints, which associate the rows of the line_items table with orders and products. However, using SQLite (as recommended earlier in the book) these statements give a syntax error:


...
-- create_table(:line_items)
   -> 0.0090s
-- execute("alter table line_items add constraint fk_line_item_products
             foreign key (product_id) references products(id)")
rake aborted!
SQLite3::SQLException: near "constraint": syntax error: alter table line_items add constraint fk_line_item_products
                 foreign key (product_id) references products(id)

Is there an alternative syntax that will work with SQLite? (Or have I done something wrong?)

Trying to understand a code example (pg 110, cart.rb) posted by Scott Gardner @ Fri, 09 May 2008 14:53:41 -0000

Scott Gardner — Fri, 09 May 2008 14:53:41 -0000

That really helped, thanks!

Nesting Modules in a hierarchy posted by Ahmet Dogramaci @ Fri, 09 May 2008 14:13:27 -0000

Ahmet Dogramaci — Fri, 09 May 2008 14:13:27 -0000

I am coming from Java to Ruby. I actually used Ruby on Rails in one of my client’s projects, but I did not understand it well at the time. Now I am trying to understand the language well so that I can create better and bigger programs.

One of the things that I did not understand well was namespaces and modules. In Programming Ruby it says that modules give you a namespace, but it never mentions that you can actually nest modules to create module hierarchies. Without the nesting, I was thinking you would have a flat namespace and end up with very long module names, or name clashes with the libraries that you use. The nesting actually gives you a facility similar to packages in Java. I think mentioning this in the new version of the book would help programmers.

Pagination posted by Sam Ruby @ Fri, 09 May 2008 14:02:13 -0000

Sam Ruby — Fri, 09 May 2008 14:02:13 -0000

I’m not sure yet. My primary goal is to cover Rails 2.0, and how to find plugins, not to cover any specific plugin. But I am prepared to be convinced otherwise…

Trying to understand a code example (pg 110, cart.rb) posted by Sam Ruby @ Fri, 09 May 2008 13:51:53 -0000

Sam Ruby — Fri, 09 May 2008 13:51:53 -0000

The block is automatically converted to a Proc, which is an object.

It may help to play with this yourself by adding your own find method to the Array class, thus:

class Array
  def my_find &block
    puts "block class = #{block.class}" 
    for item in self
      puts "testing item: #{item}" 
      if block.call(item) == true
        return item
      end
    end
    return false
  end
end

data = [1, 2, 3, 4, 5]

puts "scanning for a three" 
result = data.my_find {|i| i == 3}
puts "result: #{result}"

Trying to understand a code example (pg 110, cart.rb) posted by Scott Gardner @ Fri, 09 May 2008 12:50:23 -0000

Scott Gardner — Fri, 09 May 2008 12:50:23 -0000

Thanks for the detailed explanation. I am really just trying to put a handle on this because I realize it’s a key and common usage in Ruby/Rails. I think, for now, I will just have to rely on rote memory of how this works.

Also, can you confirm/correct your statement that this block is in fact an object? According to this explanation on rubylearning.com, a block is not an object unless it is converted to a Proc (e.g., using lambda).

Pagination posted by Karsten Wilke @ Fri, 09 May 2008 10:43:16 -0000

Karsten Wilke — Fri, 09 May 2008 10:43:16 -0000

Hi can someone tell me how pagination will be handled in the third edition? i looked into the samples but there was still the deprecated code in there.

Depot app, adding price posted by Ray Schamp @ Fri, 09 May 2008 04:16:14 -0000

Ray Schamp — Fri, 09 May 2008 04:16:14 -0000

The way I fixed it was to download the latest stable release of sqlite3 for 10.4 and build it from the source, which was easy, no snags:

untar the package
make a new directory in the folder that holds the source
cd into that, and run >../configure
Let it go, and then run > make

Note what > sqlite3 --version and >which sqlite3 returns

run > make install and see if > sqlite3 --version returns something different. If it’s the new version, you’re all set. If it’s the old one still, run > which sqlite3, and this should return the location of the new binary. I just replaced my old binary with the new one, and then it worked after that.

Sorry if these instructions are confusing, I’m sure there’s a better way to do this.

-Ray

Depot app, adding price posted by defucius tai @ Fri, 09 May 2008 03:17:19 -0000

defucius tai — Fri, 09 May 2008 03:17:19 -0000

hi, I am having the same problems with the ADD command with sqlite3 3.1.3. and the instruction above with the SWIG and to upgrade sqlite3 on macos 10.4 does not work for me.

Trying to understand a code example (pg 110, cart.rb) posted by Sam Ruby @ Fri, 09 May 2008 01:32:01 -0000

Sam Ruby — Fri, 09 May 2008 01:32:01 -0000

1. @items is initialized as an empty array

Note that this only occurs when the Cart itself is initialized. After that point, @items can change.

2. add_product receives a product object

Yes.

3. The @items array is passed to the block

More precisely, each item in the @items array is passed to the block until an item is found for which the block evaluates to true.

4. Each @items array item is checked …

This is correct.

I still do not understand how the block … knows to return the actual item object

It doesn’t.

The block is a procedure. It is passed as a parameter to the find method. It is an object with a call method. This means that the caller (in this case, the find method) can call it as many times at it likes, with whatever parameters it likes. And that is exactly what the find method does. It calls the block repeatedly with each successive item in the array until it finds one which causes the block to evaluate true. If this occurs, the find method knows which item it passed to the block, and it simply returns that item. If, instead, it exhausts the list, it simply returns nil instead.

Trying to understand a code example (pg 110, cart.rb) posted by Scott Gardner @ Thu, 08 May 2008 23:58:47 -0000

Scott Gardner — Thu, 08 May 2008 23:58:47 -0000

The following section of code (excerpted from page 110 depot_g/app/models/cart.rb line 2 in the book, but I’ve included relevant setup code) has_thrown_me_for :a => :loop…


class Cart
    attr_reader :items

    def initialize
        @items = []
    end

    def add_product(product)
        current_item = @items.find {|item| item.product == product}  # say what?!?

Here’s how I understand it:
1. @items is initialized as an empty array
2. add_product receives a product object
3. The @items array is passed to the block
4. Each @items array item is checked to see if its product.id equals the product.id of the product passed to add_product, and if so that matched item is returned to find, which then returns that item to be assigned to current_item

Can someone please confirm that I have this correct? Presuming yes, I still do not understand how the block, which resolves true or false, knows to return the actual item object when a true condition occurs.

Thanks!

Store custom data? posted by ZeFish @ Thu, 08 May 2008 19:39:40 -0000

ZeFish — Thu, 08 May 2008 19:39:40 -0000

Hi there, I’ve been reading your book and I must say that it work really well!

I just have one question tho…
Is there a way to store parameter about a user even if he doesn’t have the application?

I’ll give you an example:
In my fb application, a user can put all the dvd he bought and then shown them in his profile.
Now that every user can view his dvd in the profile, everybody can comment to a specified dvd.
But what if a user want to comment but dosen’t have the app? He click on a dvd in a profile, then he is asked to install the app, and finally back to the comment page. But how can I keep the information about wich dvd he clicked?

What's <whatis linkend=... ? posted by Dave Thomas @ Thu, 08 May 2008 16:09:35 -0000

Dave Thomas — Thu, 08 May 2008 16:09:35 -0000

Ray:

It means we have some formatting things still to implement.

Dave

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