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ianwhite committed Dec 17, 2009
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http://plugins.ardes.com > nested_has_many_through
= Rewrite of nested_has_many_through

= nested_has_many_through
== THIS IS NOT WORKING ATM

A fantastic patch/plugin has been floating around for a while:

* http://dev.rubyonrails.org/ticket/6461
* http://code.torchbox.com/svn/rails/plugins/nested_has_many_through

obrie made the original ticket and Matt Westcott released the first version of
the plugin, under the MIT license. Many others have contributed, see the trac
ticket for details.

Here is a refactored version (I didn't write the original), suitable for edge/2.0-stable
with a bunch of acceptance specs. I'm concentrating on plugin usage, once
it becomes stable, and well enough speced/understood, then it's time to pester
rails-core.

== Why republish this on github?

* The previous implementations are very poorly speced/tested, so it's pretty
hard to refactor and understand this complicated bit of sql-fu, especially
when you're aiming at a moving target (edge)
* the lastest patches don't apply on edge
* github - let's collab to make this better and get a patch accepted, fork away!

== Help out

I'm releasing 'early and often' in the hope that people will use it and find bugs/problems.
Report them at http://ianwhite.lighthouseapp.com, or fork and pull request, yada yada.

== History

Here's the original description:

This plugin makes it possible to define has_many :through relationships that
go through other has_many :through relationships, possibly through an
arbitrarily deep hierarchy. This allows associations across any number of
tables to be constructed, without having to resort to find_by_sql (which isn't
a suitable solution if you need to do eager loading through :include as well).

== Contributors

* Matt Westcott
* terceiro
* shoe
* mhoroschun
* Ian White (http://github.com/ianwhite)
* Claudio (http://github.com/masterkain)

Get in touch if you should be on this list

== Show me the money!

Here's some models from the specs:

class Author < User
has_many :posts
has_many :categories, :through => :posts, :uniq => true
has_many :similar_posts, :through => :categories, :source => :posts
has_many :similar_authors, :through => :similar_posts, :source => :author, :uniq => true
has_many :posts_of_similar_authors, :through => :similar_authors, :source => :posts, :uniq => true
has_many :commenters, :through => :posts, :uniq => true
end

class Post < ActiveRecord::Base
belongs_to :author
belongs_to :category
has_many :comments
has_many :commenters, :through => :comments, :source => :user, :uniq => true
end

The first two has_manys of Author are plain vanilla, the last four are what this plugin enables

# has_many through a has_many :through
has_many :similar_posts, :through => :categories, :source => :posts

# doubly nested has_many :through
has_many :similar_authors, :through => :similar_posts, :source => :author, :uniq => true

# whoah!
has_many :posts_of_similar_authors, :through => :similar_authors, :source => :posts, :uniq => true

# has_many through a has_many :through in another model
has_many :commenters, :through => :posts, :uniq => true

== What does it run on?

Currently the master branch is running on 2.1, and 2.2 stable branches

Recent changes have made master incompatible with rails 2.0, if you want to use this
with rails 2.0, then use the rails-2.0 branch.

If you want to run the CI suite, then check out garlic_example.rb (The CI suite
is being cooked with garlic - git://github.com/ianwhite/garlic)
* Isolate new behaviour by making new association classes for the new behaviour
* Defer to rails when possible
* More testing of normal behaviour [Maran Hidskes]
* rails 2.3 and beyond compat is target

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