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    copied!<p>the Item model could be declared as polymorphic (se here: <a href="http://guides.rails.info/association_basics.html#polymorphic-associations" rel="nofollow noreferrer">http://guides.rails.info/association_basics.html#polymorphic-associations</a>)</p> <p>so you'll declare Item:</p> <pre><code>class Item &lt; ActiveRecord::Base belongs_to :category, :polymorphic =&gt; true end </code></pre> <p>then the 3 models that act as category (I'll show one, the others are same):</p> <pre><code> class Employee &lt; ActiveRecord::Base has_one :item, :as =&gt; :category end # and so on... </code></pre> <p>this way you can associate an Item to one of the 3 models (Book, Furniture and Electronics). each instance of these models will have an 'items' atribute, like this:</p> <pre><code>@book.items # returns all the items associated to a @book object </code></pre> <p>You can also use has_many association using a polymorphic model.</p> <p>For the views, you can use Nested Form Objects (see here: <a href="http://guides.rails.info/form_helpers.html" rel="nofollow noreferrer">http://guides.rails.info/form_helpers.html</a>). basically, in each form, you should nest a form to create an Item object. to follow the Book example, you'll have something like this:</p> <pre><code> &lt;%= form_for :book, @book do |form| %&gt; &lt;%= form.text_field :isbn %&gt; &lt;!-- other fields --&gt; &lt;%= fields_for @book.item do |item_form| %&gt; &lt;%= item_form.text_field :name %&gt; &lt;% end %&gt; &lt;% end %&gt; </code></pre> <p>hope this helped you ;)</p>
 

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