cassiano-cassiano-model_lookup

= ModelLookup

Rails gem that implements the notion of a virtual (transient) lookup table inside Active Record (AR), allowing for the creation of belongs_to and has_many associations between these and physical (persistent) AR entities.

== Install

gem install cassiano-model_lookup --source http://gems.github.com

== Usage

Let's assume we want to map the 1 x N association between (US) States and Customers:

class State < ModelLookup set_domain_values [ # :id :name # ---- -------------- [ 'CA', 'California' ], [ 'FL', 'Florida' ], [ 'GA', 'Georgia' ], ... ]

model_lookup_has_many :customers

end

class Customer < ActiveRecord::Base model_lookup_belongs_to :state has_many :contacts

validates_presence_of :name, :city, :state

end

Now you can do things such as:

c = Customer.create :name => 'West Inc', :city => 'San Jose', :state => State.find_by_id('CA') => #<Customer id: 1, name: "West Inc", city: "San Jose", state: "CA">

c.state
=> #<State:0x449ee14 @id="CA", @name="California">

c.state.name => "California"

c.state.id => "CA"

State.all => [#<State:0x449ee14 @id="CA", @name="California">, #<State:0x449ee15 @id="FL", @name="Florida">, #<State:0x449ee16 @id="GA", @name="Georgia">]

s = State.first => #<State:0x449ee14 @id="CA", @name="California">

State.last => #<State:0x449ee16 @id="GA", @name="Georgia">

s.customers => [#<Customer id: 1, name: "West Inc", city: "San Jose", state: "CA">]

== License

Copyright (C) 2008 Tagview Tecnologia (Cassiano D'Andrea - [e-mail])

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.