WordPress to Rails (2) permalinks

Various changes since last time, such as adding user login authentication, with the following in the User model, which seems to mimic the WordPress authentication (at least for my password):

def check_password(plaintext_password)
  require 'phpass'
  return Phpass.new(8).check(plaintext_password, self.user_pass)
end

Thanks to Aaron Hill for a helpful post on that topic.

Biggest change has been the introduction of permalinks, and making it possible to view each blog post on a separate page. Within the Post model, I added the following:

def self.find_by_permalink(permalink)
  year, month, day, name = permalink.split('/')
  name ||= ''
  find(:first, :conditions => ["YEAR(post_date) = ? AND MONTH(post_date) = ? AND DAYOFMONTH(post_date) = ? AND post_name = ?", year.to_i, month.to_i, day.to_i, name])
end

def to_param
  permalink
end

def permalink
  post_date.strftime("%Y/%m/%d") + (post_name.empty? ? '' : "/#{post_name}")
end

Thanks to the author of this snippet for some of that.

Then in routes.rb, I have:

resources :posts, :only => [:index, :new, :create]
resources :posts, :only => [:show, :update, :destroy, :edit], :path => '', :id => /\d{4}\/\d{2}\/\d{2}(\/[0-9a-z\-_]+)?/

This preserves mydomain.com/posts and mydomain.com/posts/new URLs for listing and creating posts, but allows mydomain.com/2013/09/04/my-post as a permalink for the post itself (allowing lower-case letters, numbers, hyphens and underscores).

(I’ll leave the smileys in, just to show how clever WordPress is…)

Finally, within PostsController, replace all the Post.find occurrences with Post.find_by_permalink, and I think that’s all!