add uniqueness for product and validation in model, change all auplac…

…ated products if exists with migration

app/models/product.rb

@@ -22,7 +22,7 @@ class Product < ApplicationRecord
   has_many :prices, as: :priceable, dependent: :destroy
   has_many :categories_by_prices, through: :prices, source: :category
 
-  validates :title, presence: true, length: { in: 2..50 }
+  validates :title, presence: true, length: { in: 2..50 }, uniqueness: true
 
   scope :ordered_by_title, -> { order(:title) }
 

config/locales/en/en.yml

@@ -457,6 +457,7 @@ en:
               blank: can't be blank
               too_long: too long (maximum %{count} symbols)
               too_short: too short (minimum %{count} symbols)
+              taken: "has already been taken, please choose another one"
     form_errors:
       one: "One error prohibited %{model} from being saved"
       other: "%{count} errors prohibited this %{model} from being saved"

config/locales/uk/uk.yml

@@ -455,6 +455,7 @@ uk:
                 few: занадто коротка (мінімум %{count} знаки)
                 many: занадто коротка (мінімум %{count} знаків)
                 other: занадто коротка (мінімум %{count} знаку)
+              taken: "вже викоритовується, будь ласка оберіть іншу"
         user:
           attributes:
             avatar:

db/migrate/20230917082603_add_index_to_product.rb

@@ -0,0 +1,20 @@
+class AddIndexToProduct < ActiveRecord::Migration[6.1]
+  def up
+    duplicated_titles = Product
+      .select(:title)
+      .group(:title)
+      .having('count(title) > 1')
+      .pluck(:title)
+
+    duplicated_titles.each do |dup_title|
+      products = Product.where(title: dup_title)
+      products.map { |product| product.update(title: "#{product.title}_#{product.uuid}")}
+    end
+
+    add_index :products, :title, unique: true
+  end
+
+  def down
+    remove_index :products, :title
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2023_07_10_212500) do
+ActiveRecord::Schema.define(version: 2023_09_17_082603) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "pgcrypto"
@@ -159,6 +159,7 @@
     t.datetime "created_at", precision: 6, null: false
     t.datetime "updated_at", precision: 6, null: false
     t.index ["product_type_id"], name: "index_products_on_product_type_id"
+    t.index ["title"], name: "index_products_on_title", unique: true
     t.index ["uuid"], name: "index_products_on_uuid", unique: true
   end
 
@@ -200,7 +201,8 @@
   end
 
   create_table "versions", force: :cascade do |t|
-    t.string "item_type", null: false
+    t.string "item_type"
+    t.string "{:null=>false}"
     t.bigint "item_id", null: false
     t.string "event", null: false
     t.string "whodunnit"