andyferra/gist:33873

## gistfile1.rb
## models/post.rb
class Post

  include DataMapper::Resource

  property :id, Serial
  property :title, String, :nullable => false
  property :body, Text
  property :created_at, DateTime
  property :updated_at, DateTime

end

## controllers/posts.rb
def edit(id)
  @post = Post.get(id)
  render
end

def update(id)
  @post = Post.get(id)
  if @post.update_attributes(params[:post])
    redirect resource(@post), :message => {:notice => 'Your post was updated successfully'}
  else
    message[:error] = "Your changes could not be saved"
    render :edit
  end
end

## views/posts/show.html.haml
%h2 New Post

= error_messages_for @post
= form_for @post, :action => resource(@post) do
  .group
    .field
      = text_field :title, :label => 'Title'
  .group
    .field
      = text_area :body, :label => 'Body', :rows => 20
  .group
    .field
      = submit 'Save Post'

# <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
# <html lang='en_us' xml:lang='en_us' xmlns='http://www.w3.org/1999/xhtml'>
#   <head>
#     <title>Monospaced Media</title>
#     <meta content='text/html; charset=utf-8' http-equiv='content-type' />
#     <link type="text/css" charset="utf-8" href="/stylesheets/screen.css?120903502778" rel="Stylesheet" media="screen" />
#     <script type="text/javascript" src="/javascripts/jquery.js?120903502784"></script><script type="text/javascript" src="/javascripts/application.js?120903502759"></script>
#   </head>
#
#   <body id='posts_edit'>
#     <div id="message"></div>
#     <h2>New Post</h2>
#
#     <form method="post" action="/posts/1"><input type="hidden" value="put" name="_method"/><div class='group'>
#       <div class='field'>
#         <label for="post_title">Title</label><input type="text" class="text" value="Foo" name="post[title]" id="post_title"/>
#       </div>
#     </div>
#
#     <div class='group'>
#       <div class='field'>
#         <label for="post_body">Body</label><textarea name="post[body]" rows="20" id="post_body">Foo</textarea>
#       </div>
#     </div>
#     <div class='group'>
#       <div class='field'>
#         <input type="submit" value="Save Post" name="submit"/>
#
#       </div>
#     </div>
#     </form>
#   </body>
# </html>
	## models/post.rb
	class Post

	include DataMapper::Resource

	property :id, Serial
	property :title, String, :nullable => false
	property :body, Text
	property :created_at, DateTime
	property :updated_at, DateTime

	end

	## controllers/posts.rb
	def edit(id)
	@post = Post.get(id)
	render
	end

	def update(id)
	@post = Post.get(id)
	if @post.update_attributes(params[:post])
	redirect resource(@post), :message => {:notice => 'Your post was updated successfully'}
	else
	message[:error] = "Your changes could not be saved"
	render :edit
	end
	end

	## views/posts/show.html.haml
	%h2 New Post

	= error_messages_for @post
	= form_for @post, :action => resource(@post) do
	.group
	.field
	= text_field :title, :label => 'Title'
	.group
	.field
	= text_area :body, :label => 'Body', :rows => 20
	.group
	.field
	= submit 'Save Post'

	# <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
	# <html lang='en_us' xml:lang='en_us' xmlns='http://www.w3.org/1999/xhtml'>
	# <head>
	# <title>Monospaced Media</title>
	# <meta content='text/html; charset=utf-8' http-equiv='content-type' />
	# <link type="text/css" charset="utf-8" href="/stylesheets/screen.css?120903502778" rel="Stylesheet" media="screen" />
	# <script type="text/javascript" src="/javascripts/jquery.js?120903502784"></script><script type="text/javascript" src="/javascripts/application.js?120903502759"></script>
	# </head>
	#
	# <body id='posts_edit'>
	# <div id="message"></div>
	# <h2>New Post</h2>
	#
	# <form method="post" action="/posts/1"><input type="hidden" value="put" name="_method"/><div class='group'>
	# <div class='field'>
	# <label for="post_title">Title</label><input type="text" class="text" value="Foo" name="post[title]" id="post_title"/>
	# </div>
	# </div>
	#
	# <div class='group'>
	# <div class='field'>
	# <label for="post_body">Body</label><textarea name="post[body]" rows="20" id="post_body">Foo</textarea>
	# </div>
	# </div>
	# <div class='group'>
	# <div class='field'>
	# <input type="submit" value="Save Post" name="submit"/>
	#
	# </div>
	# </div>
	# </form>
	# </body>
	# </html>