rails _2.3.5_ appname

Unfortunately this will produce an error similar to this

  /usr/local/lib/ruby/site_ruby/1.8/rubygems.rb:827:in `report_activate_error': RubyGem version error: railties(3.0.0.beta not = 2.3.5) (Gem::LoadError)
	from /usr/local/lib/ruby/site_ruby/1.8/rubygems.rb:261:in `activate'
	from /usr/local/lib/ruby/site_ruby/1.8/rubygems.rb:68:in `gem'
	from /usr/local/bin/rails3:18

To fix this first run

  which rails

and you will get a path to your rails executable, in my case this is /usr/local/bin/rails.

Then copy rails to rails3.

  sudo cp /usr/local/bin/rails /usr/local/bin/rails3

Then open this file in your text editor (TextMate in my case).

  mate /usr/local/bin/rails

and replace two last lines so that your file now looks like

  require 'rubygems'

  version = ">= 0"

  if ARGV.first =~ /^_(.*)_$/ and Gem::Version.correct? $1 then
    version = $1
    ARGV.shift
  end

  gem 'rails', version
  load 'rails'

Thats it, now you can create your app with specific Rails version with

  rails _2.3.5_ appname

 man -t "ls" | open -f -a /Applications/Preview.app/

If you plan to do this often, you can make your life much easier by putting this inside your .bash_profile.

 pman ()
 {
   man -t "${1}" | open -f -a /Applications/Preview.app/
 }

Now you can use following to view documentation in Preview

 pman ls

Credit goes to John W. Long.

* you have area where users input phone numbers in many different formats
* output phone numbers in specific format
* you need to send SMS messages from your app
* …

You can initialize new Phone object with Phone.new

  Phone.new('5125486', '91', '385')

or

  Phone.new(:number => '5125486', :area_code => '91', :country_code => '385')

Parsing is done using Phone.parse method

    Phone.parse '091/512-5486', :country_code => '385'
    Phone.parse '(091) 512 5486', :country_code => '385'

It is smart to set default contry code first so you don’t have to provide it as option every time

    Phone.default_country_code = '385'
    Phone.parse '091/512-5486'
    Phone.parse '(091) 512 5486'

Fow now, Phone works only for Croatian, Slovenian, Bosnian and Serbian phone numbers, but Tomislav is collecting data to support other countries.

Go check it out

To set focus on first text field with Prototype I prefer something like this

  var firstField = $$('input:text:visible').first();
  if (firstField)
    firstField.focus();

but you can also try with Form.focusFirstElement or Form.findFirstElement

3RAWXQXCQDMZ

You should also add this token to all Ajax request that you hand coded. As suggested in Rails documentation you can add this line in head section.

  <%= javascript_tag "window._token = '#{form_authenticity_token}'" %>

and then add authenticity_token to parameters option of Ajax requests

  new Ajax.Request('/some/url', {
    parameters: "foo=bar&authenticity_token="+_token
  });

Remote forgery protection plugin

This can get tedious if you have a lot of Ajax requests so I wrote a simple plugin that adds authenticity token to all Ajax requests automatically.

You can install it with

  script/plugin install git://github.com/vlado/remote_forgery_protection.git

Now all you have to do is add this line inside head section of you’re layout

  <%= remote_forgery_protection %>

and all non GET Ajax request will have authenticity_token parameter automatically included.

Magic is done by wrapping Ajax.Base using Function#wrap method so this will work only if you are using Prototype.
I plan to add support for other libraries (if there is interest) in the future so keep in touch.

Remote forgery protection currently supports Prototype, jQuery and ExtJS. Let me know if you would like to see it working with some other library

Plugin page: http://github.com/vlado/remote_forgery_protection

More info:
api.rubyonrails.org/classes/ActionController/RequestForgeryProtection/ClassMethods.html
isc.sans.org/diary.html?storyid=1750
en.wikipedia.org/wiki/Cross-site_request_forgery
opensoul.org/2008/10/24/ajax-and-request-forgery-protection

if RAILS_ENV=="development"
  Page.class_eval {
    def cache?
      false
    end
  }
end

This is more of a hack then a real solution, so please use comments to point me in the right direction. I’m using Radiant version 0.8.1.

HTML for our table will look like

<table class="zebra">
  <thead>
    <tr>
      <th>Col1</th>
      <th>Col2</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>11</td>
      <td>12</td>
    </tr>
    <tr>
      <td>21</td>
      <td>22</td>
    </tr>
    <tr>
      <td>31</td>
      <td>32</td>
    </tr>
  </tbody>
</table>

We will also need some CSS to change the background of the even rows and to highlight the row mouse is over

table.zebra tr.even {
  background-color:#eee;
}
table.zebra tr:hover {
  background-color:#ccc;
}

And now all we need is as simple as

$$('table.zebra tbody tr:nth-child(even)').each(function(tr) {
  tr.addClassName('even');
});

One thing to notice is that tr:hover selector won’t work in IE 6. If you care about IE6, solution could be to observe row for mouseover event and to add hover class dynamically.

You should add

$$('table.zebra tbody tr').each(function(tr) {
  tr.observe('mouseover', function() {
    tr.addClassName('hover');
  }
});

and change table.zebra tr:hover to

table.zebra tr.hover {
  background-color:#ccc;
}

Looks like this won’t be a last post devoted to Prototype

Setting focus on the first text field with jQuery is as simple as

  $("input:text:first").focus();
  $("input:text:visible:first").focus();

Find more at http://docs.jquery.com/Selectors

Update: If you are on Rails use auto_focusable_forms, dependency free plugin that will focus first input for you.

For modern browsers you can remove it with simple css:

a:focus, a:active {
  outline:none;
}

Unfortunately, this won’t do for IE 6 and earlier.

With jQuery it’s easy to get rid of the outline in every browser that has JavaScript enabled:

$("a").click(function() {
  $(this).blur();
});

This will remove outline from the link once he is clicked. You will see the outline when clicking, but it will not stay there.

If you don’t want to se the outline at all replace click event with focus event:

$("a").focus(function() {
  $(this).blur();
});

To find more about jQuery Events visit http://docs.jquery.com/Events

session ff

session ff

To disable session suport only for a specific controller add session ff to that controller

class MyController < ApplicationController
    session  ff
end

Written like that, sessions are disabled for all actions on this controller.

Like filters, you can specify nly and :except clauses to restrict subset. The following code will disable session for first_action and third_action, but not for second_action.

class MyController < ApplicationController
  session  ff,  nly %w(first_action third_action)

  def first_action
  end

  def second_action
  end

  def third_action
  end
end

Same could be achived with session ff, :except => :second_action.

The session options are inheritable, so to disable sessions for the entire application add session ff to ApplicationController.

class ApplicationController < ActionController::Base
    session  ff
end

session :disabled => true

The downside of above approach is that if you disable sessions in ApplicationController with session ff you can't enable them later on.

But luckily there is a cure for that. Instead of session ff add this line session :disabled => true to ApplicationController.

class ApplicationController < ActionController::Base
    session :disabled => true
end

Now, you can re-enable session support in an inheriting controller with session :disabled => false.

class MyController < ApplicationController
    session :disabled => false
end

Further reading

• How to Change Session Options in RoR
• How to Per Action Session Options in RoR
• QuarkRuby: Sessions and cookies in Ruby on Rails

Technorati Tags: session, rails