# in the model
 
self.js_stub
  require 'ostruct'
  OpenStruct.new(:title => '$TITLE', :isbn => '$ISBN', :image_url => '$URL', :authors => '$AUTHORS', :published_on =>   '$PUBLISHED_ON', :pages => '$PAGES')
end
 
 
# in some helper
 
def render_javascript(name, locals=nil)
  escape_javascript render(:partial => name, :locals => locals).gsub(/\n\s*/, '')
end
 
 
# in the template
 
<% javascript_tag do -%>
  
  var TEMPLATES = {
    book_cover: function(book) {
                  return '<%= render_javascript 'books/book', :book => Book.js_stub %>'.
                    replace(/\$TITLE/g, book.title).
                    replace(/\$ISBN/g, book.isbn).
                    replace(/\$URL/g, book.image_url);
                }
  };
 
<% end -%>