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copied!<ol> <li><p>Just a couple of days ago, a similar question was asked: <a href="https://stackoverflow.com/questions/2168442/many-to-many-relationship-with-the-same-model-in-rails">“Many-to-many relationship with the same model in rails?”</a>. I tried to document extensively how to do looped associations there. Perhaps that will help you along?</p></li> <li><p>Tables without IDs in Rails are only ever seen with a <code>has_and_belongs_to_many</code> association. With regular <code>has_many :through</code> associations, the join table's model is like any other ActiveRecord model, and requires an ID column</p></li> <li><p>I'm not aware of a good convention here, but those examples are a bit strange. You'd be accessing them as <code>relationship.your</code>, which feels a bit awkward to me personally. Perhaps <code>your_person_id</code>, which would be accessed as <code>relationship.your_person</code>, and make clear that you're dealing with a <code>Person</code> instance? Another option could be <code>relationship.you</code>.</p></li> <li><p>I've never used acts_as_tree, but you can invoke it with a parameter like so: <code>acts_as_tree :foreign_key => 'my_id'</code></p></li> </ol> <p>As I mention in my answer to the <a href="https://stackoverflow.com/questions/2168442/many-to-many-relationship-with-the-same-model-in-rails">other question</a>, it looks like your biggest difficulty will be bi-directional relationships. Once a person A is connected to a person B, it is not implied that person B is connected to person A. That's unfortunately difficult to accomplish in ActiveRecord, from what I can tell.</p>

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