Rails related notes

Passing local variables to sub templates

You can pass local variables to sub templates by using a hash with the variable names as keys and the objects as values:

<%= render "shared/header", { :headline => "Welcome", :person => person } %>

These can now be accessed in shared/header with:

Headline: <%= headline %>
First name: <%= person.first_name %>

If you need to find out whether a certain local variable has been assigned a value in a particular render call, you need to use the following pattern:

<% if local_assigns.has_key? :headline %>
  Headline: <%= headline %>
<% end %>

Rails Documentation

API Docs (latest version of rails)
http://api.rubyonrails.org/

Easy to read 'getting started' guide.
http://guides.rubyonrails.org/getting_started.html

Pragmatic Programmers Guide to Programming Ruby
http://www.ruby-doc.org/docs/ProgrammingRuby/html/index.html

Rails Notes

############## using flash[:notice] with RJS  ##############
page.replace_html :notice, flash[:notice]
flash.discard

If you are using jQuery:
$("#flash_notice").html(<%=escape_javascript(flash.delete(:notice)) %>');
############## /using flash[:notice] with RJS  ##############

Routes

map.connect 'whatever/string', :controller => 'blah'.....

map.my_named_route 'whatever/string/to/match', :controller => 'blah'...

with a named route, you can now use _url and _path helpers
my_named_route_path outputs RELATIVE path i.e 'whatever/string/to/match'
my_named_route_url outputs full url path, i.e. 'http://www.myapp.com/whatever/string/to/match'

url_for helper with a couple of options to show the full url with https://protocal
url_for(:controller => "paypal", 
         :action => "purchase_order", 
         :order_id => @order.id, 
         :only_path => false, 
         :protocol => "https")

secondary_database_example.rb

product.rb
class Product < ActiveRecord::Base
  establish_connection "other_staging"
  #establish_connection "other_#{Rails.env}"
  has_many :taggings, :foreign_key => "taggable_id"
  has_many :tags, :through => :taggings

  # instead of acts_as_taggable_on - I had to rip out it's guts
  # to get the search going over multiple databases :D
  def self.tagged_with(search)
		p search
		p search.split(/,/).join("'")
		p search.split(/,/).join("'").downcase!
    j = search.split(/,/).join("'").downcase!
    Product.joins(:taggings).joins(:tags).where("LOWER(tags.name) IN ('#{search}')")
  end

end

database.yml
other_staging:
  adapter: mysql
  encoding: utf8
  database: media-staging
  username: theAdmin
  password: th3p4ssw0rd
  #host: 10.160.147.224
  host: 10.160.127.64



tag.rb and tagging.rb are irrelevant to the example.