ruby on rails, ActiveResource::Base, paginate, WillPaginate, RESTful xml resource and paginate

This sample assume that you have a service in the server that respond .xml

class NoteIntranet < ActiveResource::Base
  self.site = INTRANET_CREDENTIALS[:site]
  self.element_name = 'note'
  cattr_reader :per_page
  @@per_page = 20
  def self.paginate(*args) 
    options = args.pop 
    @@per_page = options.delete(:per_page) || @@per_page
    WillPaginate::Collection.create((options.delete(:page) || 1), @@per_page) do |pager|
      all_elements = self.find(:all, options)
      result = all_elements[pager.offset, pager.per_page].to_a
      # inject the result array into the paginated collection:
      pager.replace(result)
      unless pager.total_entries
        # the pager didn't manage to guess the total count, do it manually
        pager.total_entries = all_elements.size
      end
    end
  end

end

In the controller you may have conditions that are defined in the service, an example is a filter:

      @notes = NoteIntranet.paginate(:page => params[:page], :params => { :title => params[:title] })

In the server service, in the controller you have:

      @notes = Note.paginate(:page => params[:page], :conditions => ["title like '%?%'",params[:title]] )

This idea came from Gasper - Luis Guardiola

Xubuntu, lost desktop panels

---

First:

Alt-F2

and type:

xfce4-panel

---

Flash Messages, System Messages, Ruby on Rails, by style, debug and test

controller:

flash[:notice] = "Correct things."
flash[:error]  = "Alert things."
flash[:debug]  = "Simple debug."

views/layouts:

<%- flash.each do |name, msg| -%>
  <%= content_tag :div, msg, :id => "flash_#{name}" %>
<%- end -%>

css out of dev, in test, this can help you in both environments:

#debug{
  display:none;
}

ruby on rails i18n

An approach:

$script/plugin install git://github.com/svenfuchs/rails-i18n.git

$cp config/locales/en.yml config/locales/es-ar.yml

config/environment.rb

  config.time_zone = 'Buenos Aires'
  config.i18n.default_locale = :"es-ar"

app/views/payment_operation/show.html.erb

<%= t('views.payment.show_title', :count => @foo.size, :bar => @foo.name) %>

config/locales/es-ar.yml

es-ar:
    views:
      payment:
        show_title: 
          zero: "Mostrando operación de pago y {{bar}}."
          one: "Mostrando operación de pago y {{bar}}."
          many: "Mostrando operación de pago y {{bar}}."

Ruby on Rails, model, validate alphanumeric and space characters

class Product < ActiveRecord::Base
...
  validates_format_of :name, :with => /^([[:alpha:]]|[[:blank:]])+$/

Survive in php.. a logger method.

function logger($msg){
 if(!isset($GLOBALS['logger'])){
  $GLOBALS['logger'] = fopen("/var/www/apps/logs/dev.log","a");
 }
 fwrite($GLOBALS['logger'],"$msg\n");
}

function request($id = ''){
  logger("dir/file.php::request(id[".$id."])");
...
}

Conceptual views and Implementation Details.

FSM. Finite State Machine. This is real.

http://blog.objectmentor.com/articles/2008/11/27/the-truth-about-bdd

Languages, are implementation details?

http://blog.objectmentor.com/articles/2009/01/15/adopting-new-jvm-languages-in-the-enterprise