NEVER DO THIS

controller.rb

  def show
    if params["product_search"].present?
      @product = Product.find_by_name(params["product_search"][:name])
      if @product.blank?
        redirect_to(products_path, :notice => "Not Found")
        return
      end
    else
      @product = Product.find(params[:id])
    end


    respond_to do |format|
      format.html # show.html.erb
      format.json { render json: @product }
    end
  end

routes.rb

  post "products/show" => "products#show", :as => :product_search
  resources :products

template.html.erb

<h1>Listing products</h1>
<h2><%= flash[:notice] if flash[:notice].present? %></h2>

<%= form_for :product_search, :url => product_search_path do |f| %>
  Search
  <%= f.text_field :name %>
<% end %>


<table>
  <tr>
    <th>Name</th>
    <th>Description</th>
    <th>Price</th>
    <th></th>
    <th></th>
    <th></th>
  </tr>

<% @products.each do |product| %>
  <tr>
    <td><%= product.name %></td>
    <td><%= product.description %></td>
    <td><%= product.price %></td>
    <td><%= link_to 'Show', product %></td>
    <td><%= link_to 'Edit', edit_product_path(product) %></td>
    <td><%= link_to 'Destroy', product, confirm: 'Are you sure?', method: :delete %></td>
  </tr>
<% end %>
</table>

<br />

<%= link_to 'New Product', new_product_path %>