xlsx export for registrations list

app/views/admin/registrations/show.html.haml

@@ -3,14 +3,14 @@
     .pull-right{:style=>"margin-top:20px; margin-bottom:20px;"}
       = link_to "New", admin_users_new_path(@conference.short_title), :class => "btn btn-primary"
       = link_to "Export PDF", admin_conference_registrations_path(@conference.short_title, :format => :pdf), :class => "btn btn-success"
+      = link_to "Export xlsx", {:format => :xlsx}, :class => "btn btn-success"
 .row-fluid
   .span12
     %h2
       Registrations
       - if @registrations
         = "(#{@registrations.length})"
-      - if @attended
-        = " - Attended (#{@attended.length})"
+      = " - Attended (#{@attended})"
     %table.table.table-striped.table-bordered.table-hover#registrations
       %thead
         %th
@@ -49,4 +49,4 @@
         "bPaginate": false,
         "bLengthChange": false
       } );
-  } );
+  } );

app/views/admin/registrations/show.xlsx.axlsx

@@ -0,0 +1,25 @@
+wb = xlsx_package.workbook
+wb.add_worksheet(:name => "registrations") do |sheet|
+  bold_style = wb.styles.add_style(:b => true)
+  row = ["Attended", "Name", "Nickname", "Affilation", "Email", "Social events",
+    "With partner", "Needs access", "Other needs", "Arrival", "Departure"]
+  sheet.add_row row, :style => bold_style
+
+  @registrations.each do |reg|
+    row = []
+    row << reg.attended
+    row << "#{reg.last_name} #{reg.first_name} (#{reg.public_name})"
+    row << reg.irc_nickname
+    row << reg.company
+    row << reg.email
+    row << reg.attending_social_events
+    row << reg.attending_with_partner
+    row << reg.need_access
+    row << reg.other_needs
+    row << reg.arrival
+    row << reg.departure
+    sheet.add_row row
+  end
+  sheet.column_info[8].width = [sheet.column_info[8].width, 30].min
+end     
+