russ1985 / has_many_polymorphic

Simple replacement for has_many_polymorphs

#HasManyPolymorphic

This mixin adds a has many polymorphic relationship to a model and creates all the relationships needed by rails to handle it.

##Setup

You must define the models that you want to use inside an initializer using

RussellEdge::HasManyPolymorphic::Engine.add_models(%w(PreferenceType))

or

RussellEdge::HasManyPolymorphic::Engine.add_models("PreferenceType")

##Params

• Name

  • name of the relationship, there is a convention that whatever name you choose, the polymorphic table columns on your through table should match.

• Options

  • through - the model that handles the through relationship
  • models - models that should be included in this polymophic relationship

##Added methods

• {name param}
  • the name of your relationship is used for the method name of this method. it will return an array of the models that are related via the has_many relationships

There is an after_save call back that will save the relationships when they are added or removed. If you want to remove a relationship the models need to be destroyed and this model reloaded.

##Example Usage

###Schema

create_table :zoos, :force => true do |t|
  t.string :name
end

create_table :monkeys, :force => true do |t|
  t.string :name
end

create_table :bears, :force => true do |t|
  t.string :name
end

create_table :birds, :force => true do |t|
  t.string :name
end

create_table :zoo_animals, :force => true do |t|
  t.integer :zoo_id
  t.references :animal, :polymorphic => true
end

###Class

class Zoo < ActiveRecord::Base
  has_many_polymorphic :animals,
    :through => :zoo_animals,
	:models => [:monkeys, :birds, :bears]
end

###What you get

zoo = Zoo.first
zoo.monkeys
zoo.birds
zoo.bears

and

zoo = Zoo.first
zoo.animals

which is a concatentated array of the models. You also get the following

monkey = Monkey.first
monkey.zoos
	   
bird = Bird.first
bird.zoos

bear = Bear.first
bear.zoos

has_many_polymorphic's Issues

License missing from gemspec

RubyGems.org doesn't report a license for your gem. This is because it is not specified in the gemspec of your last release.

via e.g.

spec.license = 'MIT'
# or
spec.licenses = ['MIT', 'GPL-2']

Including a license in your gemspec is an easy way for rubygems.org and other tools to check how your gem is licensed. As you can imagine, scanning your repository for a LICENSE file or parsing the README, and then attempting to identify the license or licenses is much more difficult and more error prone. So, even for projects that already specify a license, including a license in your gemspec is a good practice. See, for example, how rubygems.org uses the gemspec to display the rails gem license.

There is even a License Finder gem to help companies/individuals ensure all gems they use meet their licensing needs. This tool depends on license information being available in the gemspec. This is an important enough issue that even Bundler now generates gems with a default 'MIT' license.

I hope you'll consider specifying a license in your gemspec. If not, please just close the issue with a nice message. In either case, I'll follow up. Thanks for your time!

Appendix:

If you need help choosing a license (sorry, I haven't checked your readme or looked for a license file), GitHub has created a license picker tool. Code without a license specified defaults to 'All rights reserved'-- denying others all rights to use of the code.
Here's a list of the license names I've found and their frequencies

p.s. In case you're wondering how I found you and why I made this issue, it's because I'm collecting stats on gems (I was originally looking for download data) and decided to collect license metadata,too, and make issues for gemspecs not specifying a license as a public service :). See the previous link or my blog post about this project for more information.

undefined method `isolate_namespace' for RussellEdge::HasManyPolymorphic::Engine:Class

Hi Russel,

I'm got this error

undefined method `isolate_namespace' for RussellEdge::HasManyPolymorphic::Engine:Class

included this gem in gemfile
added new file inside the config/initializer/has_many_polymorphic.rb

content of the file is
RussellEdge::HasManyPolymorphic::Engine.add_models(%w(Asset RightSet))

while starting the server thrown this error

can I get help from you ?...