= Zeus - the database abstraction library

Following James Golick's http://jamesgolick.com/2010/3/14/crazy-heretical-and-awesome-the-way-i-write-rails-apps.html, I thought I could implement something similar, without too much hassle.

NOTE: no code exists at the moment. These are only ideas.

== Examples

Sinatra, but Rails could use the same implementation

get "/posts" do @posts = Zeus.posts render :posts_index end

get "/post/:id" do @post = Zeus.posts.filter(:id => params[:id]).first render :post end

post "/posts" do post = Post.new post.title = params[:post][:title] post.body = params[:post][:body] post.published_at = Time.now.utc

Zeus.persist(post)

end

post "/post/:id/comments" do post = Zeus.posts.filter(:id => params[:id]).first comment = post.add_comment(params[:comment].merge(:ip => request.env["HTTP_REAL_IP"])

# Single DB transaction inserts both rows in the database
Zeus.persist(post, comment)

end

class Post def initialize @comments = [] end

def add_comment(attributes)
  comment = Comment.new
  comment.author_name  = attributes[:name]
  comment.author_email = attributes[:email]
  comment.body         = attributes[:body]
  comment.author_ip    = attributes[:ip]
  @comments << comment

  comment
end

end

class Comment end

post = Post.new post.title = "Zeus is a new library"

Zeus.configure do |config| config.model :post, :table_name => "posts" do string :title text :body integer :comments_count datetime :published_at datetime :created_at, :updated_at, :null => false

  index :published_at

  # A single argument for the block receives the Post object defined in the domain model.
  before_create do |domain_post|
    domain_post.created_at = Time.now.utc
  end

  # Accepting 2 arguments receives both the domain model instance, and the persistence model.
  before_save do |domain_post, zeus_post|
    zeus_post.comments_count = domain_post.comments.length
    domain_post.updated_at = zeus_post.updated_at = Time.now.utc
  end
end

# Convention over configuration
config.model :comment do
  integer  :post_id, :references => :posts
  string   :author_name, :author_email, :author_ip
  text     :body
  float    :spaminess
  datetime :approved_at
  datetime :created_at, :null => false

  index :post_id, :created_at, :approved_at
end

end

== Note on Patches/Pull Requests

• Fork the project.
• Make your feature addition or bug fix.
• Add tests for it. This is important so I don't break it in a future version unintentionally.
• Commit, do not mess with rakefile, version, or history. (if you want to have your own version, that is fine but bump version in a commit by itself I can ignore when I pull)
• Send me a pull request. Bonus points for topic branches.

== Copyright

Copyright (c) 2010 François Beausoleil. See LICENSE for details.