How to integrate constantcontact in ruby-on-rails

Hi, All

Please help me how to integrate constantcontact in ruby-on-rails

I have implemented but it is showing me 400 error in development log

Here is my code

<div id="full_width">
        <div class="cream_bkg">
          <h1>Suggest A Business</h1>
          <div class="full_width_content center_fix">
            <h2>Do you have a favourite business that you would like to
see on Home Shabang? Tell us and we will invite them!!</h2>
            <h3><%= flash[:error] %></h3>
            <!--form method="post" action=""-->
            <%= form_for :coupon,:url=>
{:controller=>'coupons',:action=>'comments'},:html=>{:id=>
'cc_coupon_form'} do |f| %>
              <table class="form_table suggest_business" cellpadding="0"
cellspacing="0">
                <tr>
                  <th></th>
                  <th></th>
                </tr>
                <tr>
                  <td><label for ="email"> Email:</lable></td>
                  <td>
                    <span class="blue_field">
                    <!--input id="email" class="text_field" type="text"
name="" /-->
                    <%= f.text_field :email, :id
=>'email',:class=>'text_field' %></span>
                    <span id= "email_address" class="error_msg"
style="display:none;">Please enter the Email Address.</span>
                  </td>
                </tr>
                <tr>
                  <td><label for="company_name">Company
Name:</label></td>
                  <td>
                    <span class="blue_field">
                    <!--input id="company_name" class="text_field"
type="text" name="" /-->
                    <%= f.text_field :company_name,:id
=>'company',:class=>'text_field' %></span>
                    <span id="name" class="error_msg" style
="display:none;"> Please enter the company name.</span>
                  </td>
                </tr>
                <tr>
                  <td><label for="state">State:</label></td>
                  <td>
                    <span class="blue_field">
                    <!--input id="state" class="text_field" type="text"
name="" /-->
                    <%= f.text_field :state, :id
=>'state',:class=>'text_field' %></span>
                    <span id= "business_state" class="error_msg"
style="display:none;">Please enter the state.</span>
                  </td>
                </tr>
                <tr>
                  <td><label for="city">City:</label></td>
                  <td><span class="blue_field">
                  <%= f.text_field :city, :class=> 'text_field' %>
                  <!--input id="city" class="text_field" type="text"
name=""/></span--></td>
                </tr>
                <tr>
                  <td><label for="comment">Comment:</label></td>
                  <td><span class="blue_field">
                  <!--textarea id="comment" class="text_area" rows=""
cols="" name=""></textarea-->
                      <%= f.text_area :comment,:class=> 'text_area' %>
                      </span>
                  </td>
                </tr>
                <tr>
                  <td></td>
                  <td><!--input class="submit_btn" type="button"
value="Send" /-->
                      <%= f.submit "Send", :class=> "submit_btn",
:id=>'send',
                      :type=> 'button' %>
                  </td>
                </tr>
              </table>
            <% end %>
          </div>
        </div>
      </div>

Here is my method in my controller

def comments
    unless params[:coupon].blank?
      unless params[:coupon][:email].blank?
        unless params[:coupon][:company_name].blank?
          create_contact_on_constant_contact(params[:coupon])
        else
          flash[:error] = "Comapny Name is a mandatory field"
          redirect_to static_suggest_business_path
        end
      else
        flash[:error] = "Email is a mandatory field"
        redirect_to static_suggest_business_path
      end
    else
      flash[:error] = "Email is a mandatory field"
      redirect_to static_suggest_business_path
    end
  end

  def create_contact_on_constant_contact(coupon)
    logger.debug "\n\n Coupon: #{coupon.inspect}\n\n"
    unless coupon.blank?
      #require 'httparty'
      require 'net/http'
      require 'uri'
      xml_string_response = xml_string(coupon)
      logger.debug "\n\n XML string: #{xml_string_response.inspect}\n\n"
      options = {
        :headers => {
          "Content-Type" => "application/atom+xml",
          "HTTP_AUTHORIZATION" =>
           Base64.encode64("#{'chandrareddy' + '%' +
'f6040a9e45484dbaabeab8f0e1da6726' + ':' +
'605a8e068b654ca098a32a81f8cb2ef2' }")
        },
        :body => xml_string_response,
      }
      #url =
URI.parse("https://api.constantcontact.com/ws/customers/#{'chandrareddy'}/contacts")
      response =
Net::HTTP.post_form(URI.parse("https://api.constantcontact.com/ws/customers/#{'chandrareddy'}/contacts"),
options)
      logger.debug "\n\n Response1: #{response.inspect}\n\n"
      logger.debug "\n\n Response2: #{response.body.inspect}\n\n"
    end
  end

  def xml_string( coupon )
      opt_in='ACTION_BY_CUSTOMER'
      data = {:email_address => "#{coupon[:email]}", :company_name =>
"#{coupon[:company_name]}", :contact_lists => ''}
      xml = <<EOF
<entry xmlns="http://www.w3.org/2005/Atom"><title
type="text"></title><updated>#{Time.now.strftime("%Y-%m-%dT%H:%M:%S.000Z")}</updated><author></author><id>data:,none</id><summary
type="text">Contact</summary><content
type="application/vnd.ctct+xml"><Contact
xmlns="http://ws.constantcontact.com/ns/1.0/">
EOF

      data.each do |key, val|
        node = camelize(key.to_s)

        if key == :contact_lists
          xml << %Q(<ContactLists>)
          #val.each do |list_id|
          # xml<< %Q( <ContactList id="#{ContactList.url_for(
list_id )}" />\n)
          xml << %Q(<ContactList
id="http://api.constantcontact.com/ws/customers/#{'chandrareddy'}/lists/1"
/>)
          #end
          xml << %Q(</ContactLists>)
        else
          xml << %Q(<#{node}>#{val}</#{node}>)
        end
      end

      xml += <<EOF
<OptInSource>#{opt_in}</OptInSource></Contact></content></entry>
EOF
      xml
    end

    def camelize( string )
      string.split( /[^a-z0-9]/i ).map{ |w| w.capitalize }.join
    end

I think the xml is totally wrong code, Please can any one help me how to
code right xml formate

Try this...

http://rubygems.org/gems/constant_contact