VietTH: Implement fragment cache for categories

app/helpers/categories_helper.rb

+module CategoriesHelper
+  def cache_key_for_categories
+    count = Category.all.size
+    max_updated_at = Category.maximum(:updated_at).try(:utc).try(:to_s, :number)
+    "products/all-#{count}-#{max_updated_at}"
+  end
+end
\ No newline at end of file

app/views/layouts/_sidebar.html.haml

-%h3.title Category
-%ul.nav.nav-sidebar
+- cache(cache_key_for_categories) do
+  %h3.title Category
+  %ul.nav.nav-sidebar
     = render partial: '/categories/category', collection: Category.limit(Settings.limit_category).select(Category::JSON_DEFAULT)
\ No newline at end of file

app/views/products/new.html.haml

@@ -30,6 +30,7 @@
     .form-group
       = f.label :category, class: 'col-sm-2 control-label'
       .col-sm-4
+        - cache("product-new-#{cache_key_for_categories}") do
           = f.collection_select :category_id, @categories.decorate, :id, :title, {}, class: 'form-control'
 
     .form-group

app/views/search/_form_search.html.haml

@@ -7,6 +7,7 @@
     .form-group
       = label :query, 'Category: ', class: 'col-sm-2 control-label'
       .col-sm-5
+        - cache("search-#{cache_key_for_categories}") do
           = select_tag :category, options_from_collection_for_select(@categories.decorate, :id, :title, params[:category]), {include_blank: '-- Select category --', class: 'form-control chosen-select', multiple: true}
     .form-group
       = label :query, 'Product price: ', class: 'col-sm-2 control-label'

config/environments/development.rb

@@ -11,7 +11,7 @@ Rails.application.configure do
 
   # Show full error reports and disable caching.
   config.consider_all_requests_local       = true
-  config.action_controller.perform_caching = false
+  config.action_controller.perform_caching = true
 
   # Don't care if the mailer can't send.
   config.action_mailer.raise_delivery_errors = false