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Informal

Informal is a small gem that enhances a Plain Old Ruby Object so it can be used with Rails 3 form helpers in place of an ActiveRecord model. It works with the Rails form_for helper, and simple_form as well.

Here's a quick (and slightly insane) example:

# models/command.rb
require "informal"
class Command
  include Informal::Model
  attr_accessor :command, :args
  validates_presence_of :command
  def run; `#{command} #{args}`; end
end

# views/commands/new.html.erb
<%= form_for @command do |form| %>
  <%= form.text_field :command %>
  <%= form.text_field :args %>
  <%= form.submit "Do It!" %>
<% end %>

# controllers/commands_controller.rb
def create
  command = Command.new(params[:command])
  if command.valid?
    command.run
  end
end

Installation

It's a Ruby gem, so just install it with gem install informal, add it to your bundler Gemfile, or do whatever you like to do with gems. There is nothing to configure.

Usage

The insanity of the above example aside, Informal is pretty useful for creating simple RESTful resources that don't map directly to ActiveRecord models. It evolved from handling login credentials to creating model objects that were stored in a serialized attribute of a parent resource.

In many ways using an informal model is just like using an AR model in controllers and views. The biggest difference is that you don't save an informal object, but you can add validations and check if it's valid?. If there are any validation errors, the object will have all the usual error decorations so that error messages will display properly in the form view.

Initialization, #super and attributes

If you include Informal::Model, your class automatically gets an #initialize method that takes a params hash and calls setters for all attributes in the hash. If your model class inherits from a class that has its own #initialize method that needs to get the super call, you should instead include Informal::ModelNoInit, which does not create an #initialize method. Make your own #initialize method, and in that you can assign the attributes using the #attributes= method and also call super with whatever args are needed.

License

Released under the MIT License. See the LICENSE file.

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