I hope you find it useful in integrating your Rails Apps with ConstantContact.

# in application_controller.rb
rescue_from ActionController::RoutingError, :with => :route_not_found
rescue_from ActiveRecord::RecordNotFound, :with => :record_not_found
rescue_from ActionController::MethodNotAllowed, :with => :invalid_method
rescue_from NoMethodError, :with => :show_error
rescue_from ActionView::TemplateError, :with => :template_not_found

private

def route_not_found
render :text => ‘Sorry, we could not find what you were looking for.’, :status => :not_found
end

etc.

class User > ActiveRecord::Base

HUMANIZED_ATTRIBUTES = {
:email => “E-mail address”
}

def self.human_attribute_name(attr)
HUMANIZED_ATTRIBUTES[attr.to_sym] || super
end

end

>> “”.present?
=> false

use something.present?
instead of !something.blank?

Ajax.Responders.register({
  onCreate: function() {
    if (Ajax.activeRequestCount > 0)
      Element.show('indicator');
  },

  onComplete: function() {
    if (Ajax.activeRequestCount == 0)
      Element.hide('indicator');
  }
});

Add a div element to your view with an id of ‘indicator’. Remember to keep this div from displaying by setting the display attribute to none.

#indicator{style => 'display:none'}
  = image_tag ('/images/my_loading_indicator.gif')


Here is a good site to create your own indicator image.

sudo gem install rails –version 2.1.0

You’ll do this if you have some dependency on the older rails version. To make sure your app will run when you transfer to a different machine, freeze rails into the vendor directory:

rake rails:freeze:edge TAG=rel_2-1-0

Make sure that your environment.rb specifies the corresponding version.
Finally, you may want to create a new project using an older version of rails. You can do so by:

rails _2.1.0_ project_name

And apparently, you can use that trick for other gem-installed commands, like capistrano.

Basically, time and date manipulations are easy as long as the operations involved are additions and subtractions. Quoted from the link above:

Not every arithmetic operation makes sense for dates: you could “multiply two dates” by multiplying the underlying numbers, but that would have no meaning in terms of real time, so Ruby doesn’t define those operators.

Remember:

• Time has a unit of 1 secondrequire ‘date’
  y2k = Time.gm(2000, 1, 1) # => Sat Jan 01 00:00:00 UTC 2000
  y2k + 1 # => Sat Jan 01 00:00:01 UTC 2000
  y2k – 1 # => Fri Dec 31 23:59:59 UTC 1999
  y2k + (60 * 60 * 24 * 365) # => Sun Dec 31 00:00:00 UTC 2000

  y2k_dt = DateTime.new(2000, 1, 1)
  (y2k_dt + 1).to_s # => “2000-01-02T00:00:00Z”
  (y2k_dt – 1).to_s # => “1999-12-31T00:00:00Z”
  (y2k_dt + 0.5).to_s # => “2000-01-01T12:00:00Z”
  (y2k_dt + 365).to_s # => “2000-12-31T00:00:00Z”

• While DateTime and Date have a unit of 1 dayday_one = Time.gm(1999, 12, 31)
  day_two = Time.gm(2000, 1, 1)
  day_two – day_one # => 86400.0
  day_one – day_two # => -86400.0

  day_one = DateTime.new(1999, 12, 31)
  day_two = DateTime.new(2000, 1, 1)
  day_two – day_one # => Rational(1, 1)
  day_one – day_two # => Rational(-1, 1)

Printing dates on our views is done by using the method strftime.

d = Date.today # 2008-08-12
d.strftime(‘%b %d, %Y’) # will print August 12, 2008

The following are the format codes. For reference, refer to this site.