Rubyists in Pune

Technorati: In top 50,000

2006-10-17T17:01:00.000+05:30

Today, the Learning Ruby site was ranked 48,577 by Technorati. This is good news especially since the site's been 'live' for only a month now.

Rank 48,577 means that the number of blogs, plus one, that have more than 58 distinct blogs linking to them.

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Socket Programming in Ruby

2006-10-16T13:01:00.000+05:30

I have just published an article that explains how one can do Socket Programming in Ruby.

I had been searching the internet for some information on Socket Programming in Ruby, but had not been successful. The article is a result of that. Do send me your feedback on how you found the article. Was it useful to you? I look forward to your inputs.

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The Ruby Edge

2006-10-16T07:35:00.000+05:30

The Ruby Edge is a new community driven web site for Ruby and Ruby On Rails news, tips, tricks, tutorials, books, and jobs. It's a Digg
style site with user voting, commenting, and categorization of user submissions.

Please stop by and share your Ruby/Rails knowledge.

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Ruby Certification

2006-10-11T10:25:00.000+05:30

The JavaBlackBelt Certification Community has added a Ruby - Basic Certification exam. recently. The objective of this certfication is:

To test knowledge of the language core syntax and OO concepts. You should understand that Ruby is a genuine object-oriented language and everything it manipulates with is objects. No specific API knowledge is required. Only the most frequently used built-in classes and methods are covered. The knowledge of any external libraries is not necessary. The given exam covers Ruby 1.8.x features and syntax.

After completing the free, web-based course Learning Ruby, it would be beneficial for you to give this test. All the best.

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Free Study Notes on Ruby

2006-10-09T10:59:00.000+05:30

I have created a small pdf version of my Ruby study notes. This can be downloaded from here. I am hopeful that it would be useful for students making a shift to Ruby / Rails and as always feedback and corrections are welcome in the comments.

The entire Learning Ruby courseware is available online here.

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Free Web-based Ruby Course

2006-09-15T09:37:00.000+05:30

The free, web-based Ruby course being conducted at the PuneRuby forum has been a great success. Participants are from all over the world. What's nice about this course is that anyone can join anytime and go thro' the topics at their own pace. There's always a live instructor to help you out with your problems.

The entire Learning Ruby course is now available online here.

Generate RSS Feed

2006-07-15T06:12:00.000+05:30

Neha Gupta has submitted this Ruby code snippet:

xml.rss(:class => "Recipe", :version => "x.x", :xmlns
=> "www.codewalla.com") do
xml.channel do
@Recipes = Recipe.find_all
xml.title("List of Recipes  -- Total ", Recipe.count,
" recipes")
xml.link
xml.description
xml.RecipesAuthor("CodeWalla")
@Recipes.each do |item|
xml.item do
xml.Title(item.title)
xml.link
xml.author("CodeWalla")
xml.desciption(item.description)
xml.date(item.date)
xml.category(item.category.name)
end
end
end
end

The above code is made to generate a rss feed of a particular table from a database. Here, Recipe is a table name and item is the variable in m used to store one recipe temporarily, to display its contents. This code needs to be stored in .rxml file.
Eg: D:/Copy of rails/cookbook/app/views/actor/index.rxml

It can be invoked by:
http://localhost:3000/actor/index.rxml

The output of the code is:

<rss xmlns="www.codewalla.com" version="x.x" class="Recipe">
  <channel>
    <title>List of Recipes  -- Total 4 recipes</title>
    <link/>
    <description/>
    <RecipesAuthor>CodeWalla</RecipesAuthor>
    <item>
      <Title>codewal;l</Title>
      <link/>
      <author>CodeWalla</author>
      <desciption></desciption>
      <date></date>
      <category>Dessert</category>
    </item>
    <item>
      <Title>bbbbbbbbbbbbbb</Title>
      <link/>
      <author>CodeWalla</author>
      <desciption>bbbbbbbbbbbbbb</desciption>
      <date>2006-05-04</date>
      <category>Starters</category>
    </item>
    <item>
      <Title>dsfhsjdflk</Title>
      <link/>
      <author>CodeWalla</author>
      <desciption>;kkb;k</desciption>
      <date>2006-05-04</date>
      <category>Starters</category>
    </item>
    <item>
      <Title>Ice Tea</Title>
      <link/>
      <author>CodeWalla</author>
      <desciption>Good !!!</desciption>
      <date>2006-05-04</date>
      <category>Dessert</category>
    </item>
  </channel>
</rss>

Kindly comment on this code.

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July 2006 PuneRuby meet

2006-07-14T10:01:00.000+05:30

The PuneRuby meet is fixed for this Sunday, 16th July 2006 at 17.00 hrs. The venue, as usual, is SICSR, Model Colony, Pune. The speakers are:

a. Shashank Date - President of Reevik Inc, Kansas, USA. Has an overall experience of 19 years in IT. A known name in the Ruby world, one of the programmers of the Ruby's one-click installer, and is one of the early adopters of Rails.

b. Dibya Prakash

Anyone else interested in speaking kindly let me know asap, the topic and your background.

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Validation in Rails

2006-07-13T15:16:00.000+05:30

Let's try our hand at some validation. No participant should be allowed in the database if it has an empty text field or an invalid URL for the blog_url. So, where do we put the validation? The model layer is the gatekeeper between the world of code and the database. Nothing to do with our application comes out of the database or gets stored back into the database that doesn't first go through the model.

This makes it an ideal place to put all validation; it doesn't matter whether the data comes from a form or from some programmatic manipulation in our application. If the model checks it before writing to the database, then the database will be protected from bad data.

Let's look at the source code of the model class (in app/models/participant.rb).

class Participant < ActiveRecord::Base
end

Not much to it, is there? All of the database mapping, creating, updating, searching, and so on is done in the parent class (ActiveRecord::Base, a part of Rails). Because of the joys of inheritance, our Participant class gets all of that functionality automatically.

Let's start by validating that the text fields all contain something before a row is written to the database. We do this by adding some code to the existing model, as follows:

class Participant < ActiveRecord::Base
  validates_presence_of :name, :city, :blog_url
end

The validates_presence_of( ) method is a standard Rails validator. It checks that a given field, or set of fields, is present and its contents are not empty. The screen shot, shows what happens if we try to submit a new product with none of the fields filled in. It's pretty impressive: the fields with errors are highlighted, and the errors are summarized in a nice list at the top of the form. Not bad for one line of code. You might also have noticed that after editing the participant.rb file you didn't have to restart the application to test your changes. Rails notices that the files have been changed and reloads them into the application. This is a tremendous productivity boost when developing.

We also want to make sure that each partcipant has a unique blog_url. One more line in the Participant model will do this. The uniqueness validation will perform a simple check to ensure that no other row in the participants table has the same blog_url as the row we're about to save.
validates_uniqueness_of :blog_url

Rubyists in Pune

Technorati: In top 50,000

Socket Programming in Ruby

The Ruby Edge

Ruby Certification

Free Study Notes on Ruby

Free Web-based Ruby Course

Generate RSS Feed

July 2006 PuneRuby meet

Validation in Rails

Adding a Missing Column

Configuring the Application

Rails and Database Tables

Hello, PuneRuby from Rails

Verifying Rails Installation

Ruby on Rails Installation

Ruby Miscellanea

Ruby FAQ

Writing our own Class

Reading from / Writing to Text files

Own methods in Ruby

Arrays in Ruby

Some Methods in Ruby

Simple Constructs in Ruby

Strings in Ruby

Numbers in Ruby