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copied!<p>You can do this with accepts_nested_attributes_for and nested models.</p> <p>Simple checkout</p> <ul> <li><a href="http://api.rubyonrails.org/classes/ActiveRecord/NestedAttributes/ClassMethods.html" rel="nofollow">http://api.rubyonrails.org/classes/ActiveRecord/NestedAttributes/ClassMethods.html</a></li> <li><a href="http://railscasts.com/episodes/196-nested-model-form-part-1" rel="nofollow">http://railscasts.com/episodes/196-nested-model-form-part-1</a></li> <li><a href="http://railscasts.com/episodes/197-nested-model-form-part-2" rel="nofollow">http://railscasts.com/episodes/197-nested-model-form-part-2</a></li> <li><a href="http://railscasts.com/episodes/196-nested-model-form-revised" rel="nofollow">http://railscasts.com/episodes/196-nested-model-form-revised</a></li> <li><a href="http://railscasts.com/episodes/403-dynamic-forms" rel="nofollow">http://railscasts.com/episodes/403-dynamic-forms</a></li> </ul> <p><strong>UPDATE:</strong></p> <p>add the shop attributes to the form (with fields_for => accepts_nested_attributes_for), hide these form fields. create an attr_accessor in your user model, for example called :create_shop_now, add this to your form. if :create_shop_now is checked, show the shop form fields..an user can fill in the fields. user submits the form to the create action. The create action could look like following:</p> <pre><code>def create build_resource if !params[:user][:create_show_now] params[:user].delete(:shops_attributes) end if resource.save if resource.active_for_authentication? set_flash_message :notice, :signed_up if is_navigational_format? sign_up(resource_name, resource) respond_with resource, :location => after_sign_up_path_for(resource) else set_flash_message :notice, :"signed_up_but_#{resource.inactive_message}" if is_navigational_format? expire_session_data_after_sign_in! respond_with resource, :location => after_inactive_sign_up_path_for(resource) end else clean_up_passwords resource respond_with resource end end </code></pre> <p><strong>UPDATE2</strong></p> <p>Remove your after_initialize hook in the model and update your registrations#new action to following:</p> <pre><code>def new resource = build_resource({}) resource.shops.build respond_with resource end </code></pre>

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