Rails 4 how to parameterize enum

Question

How to parameterize enum? I need to use the enum for parameter which has an integer value as a data type.

models/product.rb

class Product < ActiveRecord::Base
  enum category_id: [ :hotel, :travel, :restaurant ]
end

views/products/sidebar

<div class="col-md-3">
  <ul class="list-group">
    <li class="list-group-item">
      <span class="badge"><%= Product.where(user_id: current_user).count %></span>
      <a href="<%= provider_root_path %>">All</a>
    </li>
    <% @categories.each do |category| %>
    <li class="list-group-item">
      <span class="badge"><%= Product.where(category_id: category[1]).count %></span>
      <a href="<%= provider_product_category_path(category[0].parameterize) %>"><%= category[0].titleize %></a>
    </li>
    <% end %>
  </ul>
</div>

this line works exactly what I want:

<%= product_category_path(category[0].parameterize) %>

it produces:

'/product/category/travel'

and here is my problem:

controllers/product_controller.rb

def category
  @products = Product.where(category_id: params[:category_id]).order("created_at DESC")
  @categories = @products.category_ids
end

I need to change the params[:category_id] to integer. I have try params[:category_id].to_i but it always return 0.

Can anybody help? thanks in advance :)

Answer 1

To get product successful, you need:

Product.where(category_id: params[:category_id].to_sym).order(anything_you_want)

To get strictly integer, you need to:

Product.category_ids[params[:category_id].to_sym]