I'm a Richardson, RU? » Books & Publications

Agile Web Development with Rails Code Fix

imarichardson — Mon, 02 Oct 2006 01:29:02 +0000

If anyone is going along through the Agile Web Development with Rails book and gets to page 66 where you are using the migration “alter table products …” you’ll indubitably come across the error where Rails doesn’t seem to like what you’ve put in the migration file. You may receive an error like:

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AddPrice: migrating =====================================================



—add_column(:products, :price, :decimal, {:precision=>8, :default=>0, :scale=>2})



rake aborted!



You have a nil object when you didn’t expect it! You might have 

             \expected an instance of Array. 

             \The error occured while evaluating nil.



(See full trace by running task with—trace)

I found this post which helps out. It looks like the problem is with the decimal type specified so instead of what the book gives, type this as you’re migration and everything should work without a hitch:

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class AddPrice < ActiveRecord::Migration

  def self.up

      add_column :products,:price,:integer,:precision => 8,:scale => 2,:default => 0

  end



  def self.down

    remove_column :products, :price

  end

end

So it’s not really a fix and t doesn’t solve the fact that you don’t have a decimal, but at least it will let you move on through the book (and I still can’t figure out why it won’t work, even with rails “on the edge” working)…

Technorati Tags: Books, Tutorials, Fixes, RubyOnRails

Getting started with Ruby

imarichardson — Mon, 25 Sep 2006 09:26:40 +0000

If you’re looking to get started with Ruby on Rails, then you’ll need the “Ruby” part somewhere along the way. The great news is that is a really great language with a lot of power and really human friendly syntax. Check out these links to get rolling:

Official Ruby Language Quickstart; a 20 minute primer to the Ruby Language
Try Ruby: a really cool utility for learning Ruby that runs in your web browser
Why’s (Poignant) guide to Ruby … funny yet informative eBook for learning how Ruby works.

Technorati Tags: Ruby On Rails, Ruby

My library’s in your browser!

imarichardson — Thu, 22 Dec 2005 11:03:22 +0000

Wanna see how geek-a-fied I am? Then you’ve got to go check out my online library. It’s not the full collection, just everything I have at work. So if you can judge a man by his text … well, you make the decision.

Also, heads up for a future article – a friend came by mentioning that she’d be getting an iPod Nano (boy did the jealous engine crank up inside of me!). So after talking a bit I said I’d write about my top 10 list of things to consider after the purchase. Basically, I’ll be covering everything from protection to "cool-it-ties". So stay posted!