From: Daniel Sheppard <daniels@...>
Date: 2006-07-21T12:37:19+09:00
Subject: Re: Mongoose 0.1.1

> But, this limited success leads me to believe that I might be *much* 
> more successful using Mongoose with Rails, because Mongoose 
> is going to 
> stick very close to the ActiveRecord api.  So, it might be as easy as 
> having your model classes subclass Mongoose::Table, instead of 
> ActiveRecord::Base.  Things that wouldn't work would be stuff like 
> migrations, I think.  Also, it would be great if I could 
> figure out how 
> to get the integrated errors working like the ActiveRecord 
> stuff does.  
> I haven't really looked at that.

You've aroused my curiosity. Had a little bit of trouble figuring out
how to use mongoose (some example code would have been nice), but the
following gets some validation going. I couldn't get
validates_presence_of to work for some reason, but here's
validates_numericality_of working. Putting together a
Mongoose::ActiveTable that has most of the functionality of an
activerecord doesn't look to be that difficult. If implementations of
the rest of the methods on ActiveRecord::Base were added, you'd be able
to use validations and the other activerecord modules.

require 'mongoose'

require 'active_support'
require 'active_record/base'
require 'active_record/validations'


require 'mongoose'

require 'active_support'
require 'active_record/base'
require 'active_record/validations'


class Mongoose::ActiveTable < Mongoose::Table
  RecordNotSaved = ActiveRecord::RecordNotSaved
  def update_attribute(name, value)
    send(name.to_s + '=', value)
    save
  end  
  def new_record?
    @id.nil?
  end
  def self.human_attribute_name(attribute_key_name) #:nodoc:
    attribute_key_name.humanize
  end  
  def save!
    save || raise(RecordNotSaved)
  end
  
  def self.init_column(col_name, col_def, col_class)
    super
    meth = <<-END_OF_STRING
    def #{col_name}_before_type_cast
      #{col_name}
    end
    END_OF_STRING
    self.class_eval(meth)
  end
  
  include ActiveRecord::Validations
end


class Monkey < Mongoose::ActiveTable
  validates_numericality_of :arms
end


Mongoose::Table.db = Mongoose::Database.new(:path => 'c:/temp/mongoose')
unless Mongoose::Table.db.table_exists?('monkey')
  Mongoose::Table.db.create_table('monkey') do |t|
    t.add_column 'arms', :integer
  end
end

m = Monkey.new()
m.arms = '2a'
m.save!