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    <p>My solution is to do everything in the join model. I think this works correctly on the client transitions to or from zero associations, always guaranteeing a primary contact is designated if there is any existing association. I'd be interested to hear anyone's feedback.</p> <hr> <p>I'm new here, so cannot comment on François below. I can only edit my own entry. His solution presumes user to client is one to many, whereas my solution presumes many to many. I was thinking the user model represented an "agent" or "rep" perhaps, and would surely manage multiple clients. The question is ambiguous in this regard.</p> <hr> <pre><code>class User &lt; ActiveRecord::Base has_many :user_clients, :dependent =&gt; true has_many :clients, :through =&gt; :user_client end class UserClient &lt; ActiveRecord::Base belongs_to :user belongs_to :client # user_client join table contains :primary column after_create :init_primary before_destroy :preserve_primary def init_primary # first association for a client is always primary if self.client.user_clients.length == 1 self.primary = true self.save end end def preserve_primary if self.primary #unless this is the last association, make soemone else primary unless self.client.user_clients.length == 1 # there's gotta be a more concise way... if self.client.user_clients[0].equal? self self.client.user_clients[1].primary = true else self.client.user_clients[0].primary = true end end end end end class Client &lt; ActiveRecord::Base has_many :user_clients, :dependent =&gt; true has_many :users, :through =&gt; :user_client end </code></pre>
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