It is pretty simple to get number of work days between two dates. For example we can get the number of workdays in this month.
start_date = Date.civil(2010, 8, 1)
end_date = Date.civil(2010, 8, 31)
workdays = (start_date..end_date).select { |day| ![0, 6].include?(day.wday) }.size
I recently published a plugin that helps you turn any textarea into a markup editor. It is based on excellent markItUp! jQuery plugin.
The most simple usage with preset defaults
<html>
<head>
<%= javascript_include_tag "path/to/jquery" %>
<%= mark_it_up '#miu_test' %>
</head>
<body>
<%= form_tag do %>
<%= text_area_tag "miu_test" %>
<% end %>
</body>
</html>
You can see a lot more cool examples in action on markitup.cingel.hr.
More info
SimpleSearch brings simple search to ActiveRecord. It ads simple_search named scope that accepts query as parameter.
The idea is that you provide the query and plugin does the rest (splits query to keywords and compose where statement).
This can be very useful in case you just want to filter list of records by some query, you have autocomplete field, … or something similar.
I recently installed Rails 3 beta release but I needed to create new app with the 2.3.5. version. I was searching for a way to do that and I found this
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
Tomislav Car has just released Phone, Ruby library for phone number parsing, validation and formatting. It should save you a lot of time if you need any of the following:
* 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
* …
Rails protects controller actions from CSRF (Cross-Site Request Forgery) attacks with a token based on a random string stored in the session. The token parameter is named authenticity_token by default and will be embedded in all forms and Ajax requests generated by Rails.
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
});
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.
I am working on extension for Radiant CMS. I wanted to disable caching for development, but wasn’t able to find right method for this, so finally I did it by putting this into my extensions activate method
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.
The simplest way to disable sessions in Rails is to use session 
ff (see ActionController::SessionManagement::ClassMethods).
ffTo 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
Here is a simple method that returns number of days for wanted month and year. If year is ommited current year is selected.
def month_days(month, year=Date.today.year) mdays = [nil, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31] mdays[2] = 29 if Date.leap?(year)mdays[month] end
Simple examples:
month_days(1) => 31 month_days(2, 2007) => 28 month_days(2, 2008) => 29
Now, let’s assume we have a date from a database, and we want to find number of days in a month from that date.
month_days(date.month, date.year)
But with two more lines of code
OS X (10.4) comes with Ruby 1.8.2 already installed.
For a quick start this is OK so let’s install Rails.
Since Rails comes as gem package, first we need to install RubyGems.
Download the latest package from RubyForge and unzip it.
Now go to the directory where you unpacked the package and run
$ sudo ruby setup.rb
When asked enter your password, and after install finish you can verify that everything went well by typing:
$ gem -v
Output should look something like this, depending on version you installed
=> 0.9.4
Now installing Rails is as simple as
$ sudo gem install rails --include-dependencies
To verify installation, type:
$ rails -v => Rails 1.2.3
You can skip this step if you don’t want to use database but since Rails is a framework for developing database-backed web applications, you’ll probably want to use one.
Once the install is complete, start the MySQL server using the control panel. ( System Preferences -> Other -> MySQL ) and check Automatically Start MySQL Server on Startup
To start a new project (application), go to the directory where you plan to keep your applications (i.e. ~/Apps) and execute following commands
$ rails test_app $ cd test_app $ ./script/server
This will generate Rails skeleton in ~/Apps/test_app, and start a WEBrick server on port 3000.
Now open your browser and enter http://localhost:3000 in address bar. You should see a page with “Welcome aboard, You’re riding the Rails!” message.
We also need to tell Rails which database to use.
To do this edit database.yml file (~/Apps/test_app/config/database.yml) to look like this
development: adapter: mysql database: test_app_development username: root password: host: localhost test: adapter: mysql database: test_app_test username: root password: host: localhost production: adapter: mysql database: test_app_production username: root password: host: localhost
Naturally we also need to create a database
$ mysqladmin -u root create test_app_development
and table in that database
$ mysql -u root
mysql> create table items (
id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
name VARCHAR(100) );
Execute scaffold command
$ script/generate scaffold item
Open http://localhost:3000/items and if you see something like this
Listing items Name New item
you have everything needed to get started with Rails development so Enjoy!