#145 Integrating Active Merchant

rake gems:install

script/generate nifty_scaffold order new cart_id:integer ip_address:string first_name:string last_name:string card_type:string card_expires_on:date

script/generate model order_transaction order_id:integer action:string amount:integer success:boolean authorization:string message:string params:text

filter_parameter_logging :card_number, :card_verification

config.gem "activemerchant", :lib => "active_merchant", :version => "1.4.1"

config.after_initialize do
  ActiveMerchant::Billing::Base.mode = :test
  ::GATEWAY = ActiveMerchant::Billing::PaypalGateway.new(
    :login => "seller_1229899173_biz_api1.railscasts.com",
    :password => "FXWU58S7KXFC6HBE",
    :signature => "AGjv6SW.mTiKxtkm6L9DcSUCUgePAUDQ3L-kTdszkPG8mRfjaRZDYtSu"
  )
end

config.after_initialize do
  ActiveMerchant::Billing::Base.mode = :test
  ::GATEWAY = ActiveMerchant::Billing::BogusGateway.new
end

config.after_initialize do
  ActiveMerchant::Billing::Base.mode = :production
  ::GATEWAY = ActiveMerchant::Billing::PaypalGateway.new(
    :login => "seller_1229899173_biz_api1.railscasts.com",
    :password => "FXWU58S7KXFC6HBE",
    :signature => "AGjv6SW.mTiKxtkm6L9DcSUCUgePAUDQ3L-kTdszkPG8mRfjaRZDYtSu"
  )
end

def create
  @order = current_cart.build_order(params[:order])
  @order.ip_address = request.remote_ip
  if @order.save
    if @order.purchase
      render :action => "success"
    else
      render :action => "failure"
    end
  else
    render :action => 'new'
  end
end

has_one :order

class Order < ActiveRecord::Base
  belongs_to :cart
  has_many :transactions, :class_name => "OrderTransaction"
  
  attr_accessor :card_number, :card_verification
  
  validate_on_create :validate_card
  
  def purchase
    response = GATEWAY.purchase(price_in_cents, credit_card, purchase_options)
    transactions.create!(:action => "purchase", :amount => price_in_cents, :response => response)
    cart.update_attribute(:purchased_at, Time.now) if response.success?
    response.success?
  end
  
  def price_in_cents
    (cart.total_price*100).round
  end

  private
  
  def purchase_options
    {
      :ip => ip_address,
      :billing_address => {
        :name     => "Ryan Bates",
        :address1 => "123 Main St.",
        :city     => "New York",
        :state    => "NY",
        :country  => "US",
        :zip      => "10001"
      }
    }
  end
  
  def validate_card
    unless credit_card.valid?
      credit_card.errors.full_messages.each do |message|
        errors.add_to_base message
      end
    end
  end
  
  def credit_card
    @credit_card ||= ActiveMerchant::Billing::CreditCard.new(
      :type               => card_type,
      :number             => card_number,
      :verification_value => card_verification,
      :month              => card_expires_on.month,
      :year               => card_expires_on.year,
      :first_name         => first_name,
      :last_name          => last_name
    )
  end
end

class OrderTransaction < ActiveRecord::Base
  belongs_to :order
  serialize :params
  
  def response=(response)
    self.success       = response.success?
    self.authorization = response.authorization
    self.message       = response.message
    self.params        = response.params
  rescue ActiveMerchant::ActiveMerchantError => e
    self.success       = false
    self.authorization = nil
    self.message       = e.message
    self.params        = {}
  end
end

<% form_for @order do |f| %>
  <%= f.error_messages %>
  <p>
    <%= f.label :first_name %><br />
    <%= f.text_field :first_name %>
  </p>
  <p>
    <%= f.label :last_name %><br />
    <%= f.text_field :last_name %>
  </p>
  <p>
    <%= f.label :card_type %><br />
    <%= f.select :card_type, [["Visa", "visa"], ["MasterCard", "master"], ["Discover", "discover"], ["American Express", "american_express"]] %>
  </p>
  <p>
    <%= f.label :card_number %><br />
    <%= f.text_field :card_number %>
  </p>
  <p>
    <%= f.label :card_verification, "Card Verification Value (CVV)" %><br />
    <%= f.text_field :card_verification %>
  </p>
  <p>
    <%= f.label :card_expires_on %><br />
    <%= f.date_select :card_expires_on, :discard_day => true, :start_year => Date.today.year, :end_year => (Date.today.year+10), :add_month_numbers => true %>
  </p>
  <p><%= f.submit "Submit" %></p>
<% end %>

SUCCESS!

FAILURE