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Pastable version of Add product to cart, reject if product is already in cart

<pre class='prettyprint' language='ruby'>class ItemsController &lt; ApplicationController def create @product = Product.find(params[:product_id]) @item = Item.new(:cart =&gt; current_cart, :product =&gt; @product, :quantity =&gt; 1, :unit_price =&gt; @product.price) a = [] current_cart.items.each do |item| a &lt;&lt; item.product_id unless a.include?(item.product_id) end if a.include?(@item.product_id) flash[:notice] = &quot;Product already in cart&quot; else @item.save flash[:notice] = &quot;Product added successfully&quot; end redirect_to current_cart_url end end</pre> <a href="http://www.refactormycode.com/codes/1400-add-product-to-cart-reject-if-product-is-already-in-cart" style="color:#fff" title="As seen on RefactorMyCode.com"><img alt="Small_logo" src="http://www.refactormycode.com/images/small_logo.gif" style="border:0" /></a>