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In the project i'm currently developing under rails 4.0.0beta1, i had the need for a user based authentication in which each user could be linked to an entity. I'm kinda new to rails and had some troubles doing so. The model is as following: class User < ActiveRecord::Base end class Agency < ActiveRecord::Base end class Client < ActiveRecord::Base belongs_to :agency end What i need is for a user to be able to link to either an agency or a client but not both (those two are what i'll be calling entities). It can have no link at all and at most one link. First thing i looked for was how to do Mutli-Table inheritance (MTI) in rails. But some things blocked me: it was not available out of the box MTI looked kinda hard to implement for a newbie such as me the gems implementing the solutions seemed old and either too complexe or not complete the gems would have probably broke under rails4 as they had not been updated for a while So i looked for another solution and i found polymorphic associations . I've be on this since yesterday and took some time to make it work even with the help of Rails polymorphic has_many :through and ActiveRecord, has_many :through, and Polymorphic Associations I managed to make the examples from the question above work but it took a while and i finally have two problems: How to transform the relations in user into a has_one association and be a

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