Record is not store in DB & session.delete('key') not workin

Rails
1

Hi,

I’m creating multi page form (wizard like pages) in my application using
code at

http://snippets.dzone.com/posts/show/277#related

problem ===> When I create a new coupon first time, it is stored in DB.
After saving I try to clear out(delete old session in which coupon
object is stored) session using session.delete(‘partial_coupon’) But
session is not get clear and also coupon object is not get store in DB.

Please tell me what went wrong?

Following is controller code---->
class CouponsController < ApplicationController
before_filter :get_partial_coupon_from_session, :only =>
[:business_coupon]
after_filter :save_partial_coupon_in_session, :only =>
[:business_coupon]

def business_coupon
case request.method
when :post
@current_stage = params[‘current_stage’]
if @current_stage == “stage1”
@coupon.attributes = {:title => params[:coupon][:title]}
if valid_for_attributes(@coupon,[“title”])
@current_stage = “stage2”
end
elsif @current_stage == “stage2”
@coupon.attributes = {:tag_line => params[:coupon][:tag_line]}
if valid_for_attributes(@coupon,[“tag_line”])
@current_stage = “stage3”
end
elsif @current_stage == “stage3”
@coupon.attributes = {:price => params[:coupon][:price]}
if @coupon.save

HERE I TRY TO CLEAR SESSION DATA
        session.delete('partial_coupon')
        flash['notice']  = "Coupon successfully created."
        render :action => "show", :id => @coupon
      else
   flash[:error] = "Could not save coupon

#{@coupon.errors.full_messages().join(', ')}"
end

    end
  when :get
    @current_stage = "stage1"
end

end

private
def get_partial_coupon_from_session
unless session[‘partial_coupon’].nil?
@coupon = session[‘partial_coupon’]
else
@coupon = Coupon.new
end
end

def save_partial_coupon_in_session
  unless @coupon.nil?
    session['partial_coupon'] = @coupon
  end
end

def valid_for_attributes( model, attributes )
unless model.valid?
errors = model.errors
our_errors = Array.new
errors.each { |attr,error|
if attributes.include? attr
our_errors << [attr,error]
end
}
errors.clear
our_errors.each { |attr,error| errors.add(attr,error) }
return false unless errors.empty?
end
return true
end

def clear_stage_errors
unless session[‘partial_coupon’].nil?
session[‘partial_coupon’].errors.clear
end
end
end

############### VIEWS #############3
new.html.erb

New coupon

<% form_for(@coupon) do |f| %>
<%= hidden_field_tag “current_stage”, “#{@current_stage}”%>
<%= f.error_messages %>

<%= render :partial => “coupons/#{@current_stage}”, :locals => {:f => f}
%>

<% end %>
<%= link_to ‘Back’, coupons_path %>

_stage1.html.erb

Title
<%= text_field "coupon","title" %>

<%= submit_tag 'Next' %>

_stage2.html.erb

Tag line
<%= text_field "coupon","tag_line" %>

<%= submit_tag 'Next' %>

_stage3.html.erb

Price
<%= text_field "coupon", "price" %>

<%= submit_tag 'Create' %>

Please tell me where went wrong.?

Thanks,
Vikas