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copied!<p>You're redirecting to <code>clothes_path</code> (<code>redirect_to clothes_path</code>) and it seems you have <code>ClothController</code>. This controller should contain <code>index</code> method to render index page. Assign <code>current_cart</code> to <code>@cart</code> there:</p> <pre><code>class ClothController < ApplicationController def index @cart = current_cart end ... end </code></pre> <hr> <p><strong>UPDATE</strong></p> <p>To make <code>@cart</code> available in all views of <code>Cloth</code> controller there is a method <code>before_filter</code> where you can set <code>@cart</code> variable. You can add this definitions in your required controllers. For more details - <a href="http://guides.rubyonrails.org/action_controller_overview.html#filters" rel="nofollow">http://guides.rubyonrails.org/action_controller_overview.html#filters</a></p> <pre><code>class ClothController < ApplicationController before_filter :set_current_cart def index end ... private def set_current_cart @cart = current_cart end end </code></pre> <p><code>current_cart</code> method should be implemented as helper to be available in all controllers. (<a href="http://guides.rubyonrails.org/form_helpers.html" rel="nofollow">http://guides.rubyonrails.org/form_helpers.html</a>)</p> <hr> <p><strong>UPDATE 2</strong></p> <p>Implement a helper in <code>/app/helpers/cart_helper.rb</code>:</p> <pre><code>module CartHelper def current_cart # Your current cart method code end end </code></pre> <p>And include it into required controllers. <code>current_cart</code> method will be available in all views of controllers which contain <code>CartHelper</code>.</p> <pre><code>class ClothController < ApplicationController include CartHelper ... end </code></pre>

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