Atrrubates

  by Blake Mizerany (c) 2008
  http://github.com/bmizerany/attrubates/tree/master

Description:

Arrtubates sets meta on meta for objects and adds additional rendering helpers for ActionController::Base in Rails.

Goal

  * Work with Rails / Merb / Sinatra / Ramaze etc..
  * low, low, LOC
  * no need for Rails engines
  * keep coupling out of the controller auto-magicly (i.e. passing locals)
  * keep state in models/objects

Install:

General use:

  sudo gem install attrubates

Rails (edge):

  ./script/plugin install git://github.com/bmizerany/attrubates.git

Rails (not so edgy)

download and extract this in ./vendor/plugins/attrubates

  http://github.com/bmizerany/sinatra/tarball/master

Usage

Attrubate a Class

  class Foo
    attrubates :meta => [:show, :edit, :hide],
               :attrs => [:foo, :bar],
               :defaults => {:foo => :show, :bar => :edit, :self => :show}
  end

This will generate these methods on Foo:

  # general
  attrubate(attr_name, state)
  attrubated # => { :foo => :show } # shows defaults by default

  # on foo
  show_foo?
  edit_foo?
  hide_foo?

  # on bar
  show_bar?
  edit_bar?
  hide_bar?

  # on self for overall state
  show_self?
  edit_self?
  hide_self?

  # specific setters
  show_attrubate(sym)
  edit_attrubate(sym)
  hide_attrubate(sym)

Example

  foo = Foo.new
  foo.show_foo? # => true
  foo.edit_attrubate(:foo)
  foo.show_foo? # => false
  foo.edit_foo? # => true

Rails (as a plugin)

  render_attrubate object, attr_name = nil, options = {}

This renders the associated partial for the object state

Options:

• :force ignore the objects contained state and render
• :prefix the path prefix (default is ‘shared/attrubates’)
• all others are passed to ActionController::Base#render

*Examples of use*:

Overall state

  render_attrubate @foo # => render :partial => 'shared/attrubates/foo/show', :locals => { :foo => @foo }

Attribute specific state

  render_attrubate @foo, :bar # => render :partial => 'shared/attrubates/foo/bar_edit', :locals => { :foo => @foo }

Passed locals

  render_attrubate @foo, :locals => { :baz => some_new_object }
                         # => render
                         :partial => 'shared/attrubates/foo/show',
                         :locals { :foo => @foo, :baz => some_new_object }

All together now

  # app/controllers/foo_controller.rb
  class FooController < ApplicationController
    def edit_bar
      @foo = Foo.find(params[:id])
      @foo.edit_attrubate(:bar)
      render :action => :show
    end

    ...

  end

  # app/views/foo/show.html.erb
  A bunch of html showing off all my other attribute values
  <%= render_attrubate @foo, :bar %>

  # app/views/shared/attrubates/foo/_bar_edit.html.erb
  <% form_for foo, :url => foo_url(foo), :method => :put do |form| %>
    <%= form.text_field :bar %>
    <%= submit_tag %>
  <% end %>

Enjoy!