added sorting service, added selector on view

app/controllers/account/products_controller.rb

@@ -1,6 +1,6 @@
 class Account::ProductsController < Account::BaseController
   def index
-    @products = collection
+    @products = Sort.new(collection, params).sort
   end
 
   def show
@@ -56,7 +56,7 @@ def resource
   end
 
   def collection
-    Product.ordered_by_title
+    Product.all
   end
 
   def product_params

app/helpers/account/products_helper.rb

@@ -0,0 +1,10 @@
+module Account::ProductsHelper
+  def collection
+    [
+      [I18n.t("sort.id_asc"), "id asc"],
+      [I18n.t("sort.id_desc"), "id desc"],
+      [I18n.t("sort.title_asc"), "title asc"],
+      [I18n.t("sort.title_desc"), "title desc"]
+    ]
+  end
+end

app/models/product.rb

@@ -24,8 +24,6 @@ class Product < ApplicationRecord
 
   validates :title, presence: true, length: { in: 2..50 }
 
-  scope :ordered_by_title, -> { order(:title) }
-
   accepts_nested_attributes_for :prices, reject_if: :blank_prices, allow_destroy: true
 
   def self.diaper

app/services/sort.rb

@@ -0,0 +1,18 @@
+class Sort
+  attr_accessor :collection, :params
+
+  def initialize(collection, params)
+    @collection = collection
+    @params     = params
+  end
+
+  def sort
+    collection.order(sorting_params)
+  end
+
+  private
+
+  def sorting_params
+    params.nil? ? "id asc" : (params[:sort].presence || "id asc")
+  end
+end

app/views/account/products/index.html.slim

@@ -4,6 +4,13 @@
       i.fa.fa-plus.mr-2
       span =t('.add_product_button')
 
+  p.d-inline.mr-3
+    = t('sort.sort_by')
+  div.d-inline-block
+    = form_with method: :get do |form|
+
+      = form.select :sort, collection, { selected: params[:sort], include_blank: true }, class: 'form-control mr-5', onchange: 'this.form.submit()'
+
   table.table
     thead
       tr

config/locales/en/en.yml

@@ -699,3 +699,9 @@ en:
       long: "%B %d, %Y %H:%M"
       short: "%d %b %H:%M"
     pm: pm
+  sort:
+    sort_by: Sort by
+    id_asc: ID, ascending
+    id_desc: ID, descending
+    title_asc: Title, ascending
+    title_desc: Title, descending

config/locales/uk/uk.yml

@@ -755,3 +755,9 @@ uk:
       long: "%d %B %Y, %H:%M"
       short: "%d %b, %H:%M"
     pm: по полудні
+  sort:
+    sort_by: Сортувати за
+    id_asc: ID, за зростанням
+    id_desc: ID, за спаданням
+    title_asc: Назва, за зростанням
+    title_desc: Назва, за спаданням