svs

class QuotationWorkflow

  def initialize(object)
    @object = object
  end

  include Workflow

  workflow do
    state :created do

svs

class QuotationStatusPolicy

  def initialize(quotation)
    @quotation = quotation
  end

  # STATUSES
  def unconfirmed?
    [:mildly_interested, :negotiating].include?(quality)
  end

svs

class Quotation

  include DataMapper::Resource
  # ...snip...
  property :quoted_kms, Float
  property :quoted_per_km, Float
  property :quoted_price, Float

  property :start_date, Date, :required => true
  property :end_date, Date, :required => true

svs

require 'forwardable'

class User

  extend Forwardable
  attr_accessor :view_delegate_class
  def_delegators :view_delegate, :full_name
  
  def initialize(first_name, last_name)
    @first_name = first_name  

svs

class FooController < ApplicationController
  def index
    search_params = (params[:quotation] || {}).select{|k,v| !v.blank?}
    q = search_params.delete("user")
    if q
      q = "%#{q}%"
      search_params[:intended_trip] = {:user => {:conditions => ['email ilike ? or first_name ilike ? or last_name ilike ? or   mobile_number ilike ?', q, q, q, q]}} 
    end
    if params[:all] 
      @quotations = Quotation.all(search_params)

svs

class QuotationsController  < ApplicationController
  def index
    @params = QuotationsIndexParams.new(params)
    (redirect_to request.referer || quotations_path, :error => "Bad Request", :status => 400 and return) unless @params.valid?
    @quotations = Quotation.search(@params.search_params).
                            send(@params.scope, @params.scope_params).
                            sorted_by(@params.sort.to_sym).
                            page(params[:page])
    respond_to do |format|
      format.html # index.html.erb

svs

class QuotationsIndexParams
  include Virtus
  include DataMapper::Validations

  attribute :scope, String, :default => 'pending'
  attribute :sort, String, :default => 'poolability'
  attribute :quotation, Hash, :default => {}
  attribute :date, Date
  validates_within :scope, :set => [nil,'all','pending','to_call','to_pool', 'cabbed']
  

svs

# let the argument errors come from the typecast.
# one should not worry about the class of the object, just its capabilities.

def initialize(hash = {})
  @name     = hash[:name].to_s
  @price    = hash[:price].to_f
  @quantity = Integer(hash[:quantity] || 1)
  @list     = List.new(hash[:list])
end

svs

# things controller

def update
  @thing = Thing.find(params[:id])
  @thing.update_attributes(params[:thing])
  ...
end

svs

# POST {:id => <article_id>, :action => :update, :set_state => :published, :article => {:title => "foo"}}

def update
  @article = Article.find(params[:id])
  @article.update!(params) # we call a method in Article which deals with our params
  ...
end