ParamsScope
===========

This plugin defines ActiveRecord::Base#params_scope(params, options = {}) and
some other relatives.

Examples
=======

 class User < ActiveRecord::Base
   named_scope :age, lambda{|age| {:conditions => ["age = ?", age]}}
   named_scope :city, lambda{|city| {:conditions => ["city = ?", city]}}
   named_scope :closed, lambda{|closed| {:conditions => ["closed = ?", closed]}}
   named_order_scope :order
 end
 
 class UsersController < ApplicationController
   def index
     # params may be {:age => "30", :city => "Tokyo"}
     @users = User.params_scope(params).find(:all, :defaults => {:closed => false})
     # => User.closed(false).closed(false).age(30).city("Tokyo").find(:all)
   end
 end


 User.params_scope(:order => ["age", "asc", "updated_at, "desc"]).find(:all)
 # => User.find(:all, :order => "age ASC, updated_at DESC")

TODOs
=======
* Implicit scoping: If a given key is the name of a column, use it as a dynamic scope
* Support range paramaters in some ways.

Copyright (c) 2009 Hiroshi Saito (yakitara.com), released under the MIT license