While working on a legacy data conversion project I decided to create a Rails project in order to cheat so I didn't have to write a ton of SQL statements to dump things to flat files in order to operate on them. However, while doing this, I realized that the table names, and the entire model structure of the legacy application was jacked up hard.
This caused me to use has_and_belongs_to_many with the :through argument along with association_foreign_key and foreign_key. Let me tell you how stupid I felt when I realized I was looking at the wrong version docs.
Brain needs to be on before turning to Google for the answer. The code that does what I needed is below:
has_and_belongs_to_many :users, :join_table => "ib_users_accounts_link",
:foreign_key => "accounts_id",
:association_foreign_key => "user_id"
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