sample.html.erb

<p id="notice"><%= notice %></p>

<p>
  <b>ID:</b>
  <%= @product.id %>
</p>

<p>
  <b>Name:</b>
  <%= @product.name %>
</p>

<p>
  <b>Price:</b>
  <%= @product.price %>
</p>

<p>
  <b>Description:</b>
  <%= @product.description %>
</p>

<p>
  <b>Product picture:</b>
  <%= @product.product_picture %>
</p>

<p>
  <b>In cart:</b>
  <%= @product.in_cart %>
</p>

<p>
  <b>Existing reviews:</b>
  <% @review.each do |a_review| %>
  <p>Review ID: <%= a_review.id %></p>
  <p>    <%= a_review.body %></p>
  <% end %>
</p>


  <form action='/reviews/new' method='get'>
  <input type='hidden' value="<%= @product.id %>" name='product_id'/>
  <button type="submit">Write your review for <%= @product.name %></button> 

<% if @product.in_cart == false %>
  <form action='/products/<%= @product.id %>' method='put'>
  <input type='hidden' value="<%= true %>" name='product_in_cart'/>
  <button type="submit">Add to cart</button> 

<% elsif @product.in_cart == true %>
  <form action='/products/<%= @product.id %>' method='put'>
  <input type='hidden' value="<%= false %>" name='product_in_cart'/>
  <button type="submit">Remove from cart</button> 

<% end %>


<%= link_to 'Edit', edit_product_path(@product) %> |
<%= link_to 'Back', products_path %>

<%= render 'cart' %>