诗歌rails 之Tableless Model

# models/recommendation.rb
class Recommendation < ActiveRecord::Base
  def self.columns() @columns ||= []; end
 
  def self.column(name, sql_type = nil, default = nil, null = true)
    columns << ActiveRecord::ConnectionAdapters::Column.new(name.to_s, default, sql_type.to_s, null)
  end
  
  column :from_email, :string
  column :to_email, :string
  column :article_id, :integer
  column :message, :text
  
  validates_format_of :from_email, :to_email, :with => /^[-a-z0-9_+\.]+\@([-a-z0-9]+\.)+[a-z0-9]{2,4}$/i
  validates_length_of :message, :maximum => 500
  
  belongs_to :article
end

# recommendations_controller.rb
def new
  @recommendation = Recommendation.new(:article_id => params[:article_id])
end

def create
  @recommendation = Recommendation.new(params[:recommendation])
  if @recommendation.valid?
    # send email
    flash[:notice] = "Successfully created recommendation."
    redirect_to root_url
  else
    render :action => 'new'
  end
end