In most of my rails applications I need to check if a certain object is associated with another object. I usually do this the long way, so I finally decided to create a plugin for a project I'm working on called Scrum&Cola
Ok, first you'll need ActiveRecord classes, with associations.
class Post < ActiveRecord::Base
belongs_to :author
end
class Author < ActiveRecord::Base
has_many :posts
end
Next find a post, and an author.
post = Post.find(1)
author = Author.find(1)
Now lets see if they're associated.
post.associated_with? author
or I can do it the other way around
author.associated_with? post
This will return a true or false!
To run the tests, create a database associated_with_test and simply just into the plugin's directory and type rake
I still have to write tests for polymorphic relationships, but i've "tested" manually and it works fine.. expect them up soon.
Copyright (c) 2010 Mark Gandolfo, released under the MIT license