Rails 3.2 Friendly Date Routing

I want to implement a blog \ news application with the ability:

• show all messages from root: example.com/
• show all messages responding for one year: example.com/2012/
• show all posts for the year and month: example.com/2012/07/
• show message by its date and bullet: example.com/2012/07/slug-of-the-post

So, I created a layout for the file routes.rb:

# GET /?page=1
root :to => "posts#index"

match "/posts" => redirect("/")
match "/posts/" => redirect("/")

# Get /posts/2012/?page=1
match "/posts/:year", :to => "posts#index",
  :constraints => { :year => /\d{4}/ }

# Get /posts/2012/07/?page=1
match "/posts/:year/:month", :to => "posts#index",
  :constraints => { :year => /\d{4}/, :month => /\d{1,2}/ }

# Get /posts/2012/07/slug-of-the-post
match "/posts/:year/:month/:slug", :to => "posts#show", :as => :post,
  :constraints => { :year => /\d{4}/, :month => /\d{1,2}/, :slug => /[a-z0-9\-]+/ }

So, I have to work with parameters in action indexand just get post by slug in action show(checking if date corct is an option):

# GET /posts?page=1
def index
  #render :text => "posts#index<br/><br/>#{params.to_s}"
  @posts = Post.order('created_at DESC').page(params[:page])
  # sould be more complicated in future
end

# GET /posts/2012/07/19/slug
def show
  #render :text => "posts#show<br/><br/>#{params.to_s}"
  @post = Post.find_by_slug(params[:slug])
end

Also I need to implement to_paramfor my model:

def to_param
  "#{created_at.year}/#{created_at.month}/#{slug}"
end

This is all that I learned from all the night searches in api / guide / SO.

But the problem is that for me more and more things arise that are worn for rails:

• localhost/, , show, : year (sic!):

  No route matches {:controller=>"posts", :action=>"show", :year=>#<Post id: 12, slug: "*", title: "*", content: "*", created_at: "2012-07-19 15:25:38", updated_at: "2012-07-19 15:25:38">}
  

• localhost/posts/2012/07/cut-test, :

  No route matches {:controller=>"posts", :action=>"show", :year=>#<Post id: 12, slug: "*", title: "*", content: "*", created_at: "2012-07-19 15:25:38", updated_at: "2012-07-19 15:25:38">}
  

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