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    copied!<p>First off, as suggested by @nash, you should remove <code>@profile = @user.create_profile(params[:profile])</code> from your <code>create</code> action. <code>accepts_nested_attributes_for</code> will automatically create your profile for you.</p> <p>Check that your view is set up correctly for nested attributes. Should shouldn't be seeing anything in <code>params[:profile]</code>. The profile attributes need to come through in <code>params[:user][:profile_attributes]</code> for nested models to work correctly.</p> <p>In summary, your <code>create</code> action should look like this:</p> <pre><code>def create @user = User.new(params[:user]) if @user.save redirect_to root_url, :notice =&gt; "user created successfully!" else render "new" end end </code></pre> <p>Your form view (typically <code>_form.html.erb</code>) should look something like this:</p> <pre><code>&lt;%= form_for @user do |f| %&gt; Email: &lt;%= f.text_field :email %&gt; Password: &lt;%= f.password_field :password %&gt; &lt;%= f.fields_for :profile do |profile_fields| %&gt; Bio: &lt;%= profile_fields.text_field :bio %&gt; Birthday: &lt;%= profile_fields.date_select :birthday %&gt; Color: &lt;%= profile_fields.text_field :color %&gt; &lt;% end %&gt; &lt;%= f.submit "Save" %&gt; &lt;% end %&gt; </code></pre> <p>For more information, <a href="http://archives.ryandaigle.com/articles/2009/2/1/what-s-new-in-edge-rails-nested-attributes" rel="nofollow">see this old but great tutorial by Ryan Daigle</a>.</p>
 

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