If statement to check if User has a product : One User has many products, one product only belongs to one user. In User profile, I want to implement this concept:

1/ If user does not have a product, "Create new product" button is available
2/ If user already has a store, both "Create new product" and list of products that can be clicked on to direct to the product itself

<% if @product.include? current_user.id %>

```ruby
<% if @product.include? current_user.id %>
<%= link_to 'My product', product_path %>
<% end %>
<%= link_to 'Create New Product', new_product_path %>
<%= link_to 'Edit', edit_user_registration_path %>
```

Expect:
1/ If user does not have a product, "Create new product" button is available
2/ If user already has a store, both "Create new product" and list of products that can be clicked on to direct to the product itself