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    <p>If you call <code>account.users.size</code> instead of <code>account.users.count</code> it will also include users which have been built but not saved to the database.</p> <p><strong>HOWEVER</strong> this will not fully solve your problem. When you call <code>account</code> in a user it is not returning the same account instance that <code>@account</code> is pointing to so it does not know about the new users. I believe this will be "fixed" in Rails 3, but in the meantime I can think of a couple solutions.</p> <p>If you are saving the account the same time you are adding users (which I assume so since you are calling <code>update_attributes</code>) then the validation can go in there.</p> <pre><code># in account.rb def validate_max_users_have_not_been_reached errors.add_to_base("You cannot have more than #{maximum_amount_of_users} users on this account.") unless users.size &lt; maximum_amount_of_users end </code></pre> <p>I'm not sure how you are saving the associated models, but if account validation fails they should not be saved.</p> <p>The other solution is to reset the <code>user.account</code> instance to self when updating user attributes. You could do this in the users_attributes setter method.</p> <pre><code># in account.rb def users_attributes=(attributes) #... user.account = self #... end </code></pre> <p>This way user's account will point to the same account instance so <code>account.users.size</code> should return the amount. In this case you would keep the validations in the user model.</p> <p>It's a tricky problem but hopefully this gave you some ideas on how to solve it.</p>
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