Tableless models in Rails 3

base_model.rb

class BaseModel < 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

  def save(validate = true)
    validate ? valid? : true
  end
end

class FormQuery < BaseModel
  column :date_from, :date
  column :date_until, :date
end