Railscasts - ActiveResource Basics

#94

Feb 24, 2008

ActiveResource Basics

ActiveResource allows you to easily communicate between multiple Rails applications. See how in this episode.

Tags: active-resource

Download (15.6 MB, 7:07)

alternative download for iPod & Apple TV (9.6 MB, 7:07)

# models/product.rb
class Product < ActiveResource::Base
  self.site = "http://localhost:3000"
end

# models/post.rb
class Post < ActiveRecord::Base
  def product
    @product ||= Product.find(product_id) unless product_id.blank?
  end
end

<!-- views/posts/edit.html.erb -->
<p>
  <%= f.label :product_id %>
  <%= f.collection_select :product_id, Product.find(:all), :id, :name %>
</p>

<!-- views/posts/show.html.erb -->
<% if @post.product %>
  <strong><%=h @post.product.name %></strong>
<% end %>

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24 comments

1. Johannes Feb 25, 2008 at 00:15

Thanks for that episode.
Just yesterday I was thinking about how to do the communication between two rails applications. So this is a really big help for me :-)

I'm looking forward to the next episode on this topic :-)

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2. Martin Feb 25, 2008 at 00:58

I also think that ActiveResource is a great way to access remote data. In fact I am using it to store and access data in Amazon's SimpleDB webservice.

If anybody wants to dig into this, check out my little Tutorial over at the Amazon AWS site:

http://developer.amazonwebservices.com/connect/entry.jspa?categoryID=152&externalID=1242

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3. Phil Feb 25, 2008 at 01:56

Does ActiveResource know that its looking for a Product controller because its called Product.rb? what if you already had a product model? how could you tell ActiveResorce to look for a product controller at that site?

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4. Alexander Lomakin Feb 25, 2008 at 05:34

Thanks! It's useful.

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5. Frankie Roberto Feb 26, 2008 at 02:07

This is pretty cool - I hadn't heard of ActiveResource before.

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6. Fred Feb 26, 2008 at 07:24

Wow, that was really interesting.

It's good to know it can be so easily implemented.

Thanks once again Ryan.

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7. Mike Feb 26, 2008 at 08:14

Rails is so cool!

Ryan, do you want to do a railscast about TimeZones like TzTime or the new edge zone?

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8. oin Feb 26, 2008 at 10:48

Could you please, pretty please use some other program to encode your videos? I don't own a Mac and every player I try to play your screencasts with fails to read its index and so I can't

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9. oin Feb 26, 2008 at 10:50

seek inside the video at all. I tried mplayer/xine/vlc on Linux

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10. Ryan Bates Feb 26, 2008 at 15:11

@Phil, good question, what if you already have a Product model? Looking at the source it appears it's possible to set the element_name or collection_name like this in the class:

self.element_name = 'product'

That way you can give the class another name such as RemoteProduct.

@oin, I'll look into providing the movies in an alternative (flash?) format. Thanks for the feedback.

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11. drozzy Feb 27, 2008 at 06:26

Hello Ryan,
I enjoyed immensely your railcasts. I've watched all of them over the course of last 3 days.
Is it just me - or do you seem more stressed in a later railcasts?

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12. Ryan Bates Feb 28, 2008 at 09:09

@drozzy, I suppose I've been a little stressed lately. But good news is I'm off work this week so I have time to clear off the stuff that's been building up on my plate. Thank for your concern.

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13. oin Feb 29, 2008 at 05:29

@Ryan: I don't think the format is the problem, since I can seek perfectly in other .movs or .m4vs, but not yours

I forgot to say: thanks for the great railscasts!

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14. Ryan Bates Feb 29, 2008 at 11:09

@oin, that's very strange. I'm using the Animation codec for the .mov files, so that might be a problem. The .m4v is H.264 so I would imagine that would work. I exported them using QuickTime Pro.

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15. Stephen Mar 01, 2008 at 09:55

Ryan - thanks again!
You have a knack for making episodes about exactly the problem I'm tackling.

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16. jhkim Mar 05, 2008 at 18:02

Cool!! Thanks a lot.

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17. Javier Apr 02, 2008 at 09:55

Ryan, you just saved my day with Railscast #94 and #95! For HOURS I was looking for a short and neat little howto in ActiveResource as the one you made. Muchas gracias! :-)

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18. руби разработчик Jul 20, 2008 at 07:18

Where this possible uses?

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19. Store Crowd May 06, 2009 at 16:53

Is it possible to use activeresource with MacRuby? I'm having troubles.

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20. emlak Oct 02, 2009 at 06:12

Thanks..

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21. web tasarım Oct 02, 2009 at 06:12

Thanks..

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22. RailsCast #1 fan Oct 14, 2009 at 16:05

Great tutorial as always.

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23. H.J. Blok Nov 27, 2009 at 10:01

Thanx for the tutorial. One thing you should not forget is to create the migration. I only copied the code above. It raised a bunch of errors I couldn't solve until I discovered I've missed the migration.

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24. john Dec 14, 2009 at 23:53

Just thanks, nice job.

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25. winttery Jan 06, 2010 at 22:51

It is the first time for me to hear this. it did broadern my horizon.
very appreciated.iwish it could be used by myself.

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26. Kolyanya Feb 21, 2010 at 04:10

Super!!!

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27. Vance Bennet Mar 11, 2010 at 11:11

Hey Ryan, thanks for the great screencast. Where can one find the source for #94 and #95.

Thanks a bunch,

-Vance

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28. fha loans Apr 30, 2010 at 23:36

Love this episode. Curious what it will be like for rails 3

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29. convert hd video May 04, 2010 at 23:58

I think you will be successful！

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I really appreciate what you post.

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Just thanks, nice job.

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33. APPLE 15-inch PowerBook G4 battery Jul 30, 2010 at 23:12

It raised a bunch of errors I couldn't solve until I discovered I've missed the migration.

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34. sharme Jul 31, 2010 at 05:58

Just thanks, nice job.

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35. sharme Jul 31, 2010 at 05:59

Thanks

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For HOURS I was looking for a short and neat little howto in ActiveResource as the one you made. Muchas gracias!

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ActiveResource Basics

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