Change barcode to a has_many relation

app/controllers/products_controller.rb

@@ -32,7 +32,7 @@ class ProductsController < ApplicationController
   end
 
   def from_barcode
-    render json: Product.find_by_barcode(params.require(:barcode))
+    render json: Barcode.find_by_code(params.require(:barcode)).try(:product)
   end
 
   private

app/models/barcode.rb

@@ -0,0 +1,17 @@
+# == Schema Information
+#
+# Table name: barcodes
+#
+#  id         :integer          not null, primary key
+#  product_id :integer
+#  code       :string           default(""), not null
+#  created_at :datetime
+#  updated_at :datetime
+#
+
+class Barcode < ActiveRecord::Base
+  belongs_to :product
+
+  validates :product, presence: true
+  validates :code, uniqueness: true
+end

app/models/product.rb

@@ -15,13 +15,13 @@
 #  stock               :integer          default("0"), not null
 #  calories            :integer
 #  deleted             :boolean          default("f")
-#  barcode             :string           default(""), not null
 #
 
 class Product < ActiveRecord::Base
   include Avatarable
 
   has_many :order_items
+  has_many :barcodes
 
   enum category: %w(food beverages other)
 
@@ -29,7 +29,6 @@ class Product < ActiveRecord::Base
   validates :price_cents, presence: true, numericality: { only_integer: true, greater_than: 0 }
   validates :stock,       presence: true, numericality: { only_integer: true, greater_than_or_equal_to: 0 }
   validates :calories,    numericality: { only_integer: true, allow_nil: true, greater_than_or_equal_to: 0 }
-  validates :barcode,     presence: true, uniqueness: true
 
   scope :for_sale, -> { where deleted: false }
 

db/migrate/20150919091214_add_barcode_to_products.rb

@@ -1,5 +1,10 @@
 class AddBarcodeToProducts < ActiveRecord::Migration
   def change
-    add_column :products, :barcode, :string, null: false, default: ""
+    create_table :barcodes do |t|
+      t.references :product
+      t.string :code, index: true, null: false, default: ""
+
+      t.timestamps
+    end
   end
 end

db/schema.rb

@@ -13,6 +13,15 @@
 
 ActiveRecord::Schema.define(version: 20150919091214) do
 
+  create_table "barcodes", force: :cascade do |t|
+    t.integer  "product_id"
+    t.string   "code",       default: "", null: false
+    t.datetime "created_at"
+    t.datetime "updated_at"
+  end
+
+  add_index "barcodes", ["code"], name: "index_barcodes_on_code"
+
   create_table "delayed_jobs", force: :cascade do |t|
     t.integer  "priority",   default: 0, null: false
     t.integer  "attempts",   default: 0, null: false
@@ -60,7 +69,6 @@ ActiveRecord::Schema.define(version: 20150919091214) do
     t.integer  "stock",               default: 0,     null: false
     t.integer  "calories"
     t.boolean  "deleted",             default: false
-    t.string   "barcode",             default: "",    null: false
   end
 
   create_table "users", force: :cascade do |t|

spec/factories/products.rb

@@ -15,7 +15,6 @@
 #  stock               :integer          default("0"), not null
 #  calories            :integer
 #  deleted             :boolean          default("f")
-#  barcode             :string           default(""), not null
 #
 
 require 'faker'

spec/models/product_spec.rb

@@ -15,7 +15,6 @@
 #  stock               :integer          default("0"), not null
 #  calories            :integer
 #  deleted             :boolean          default("f")
-#  barcode             :string           default(""), not null
 #
 
 describe Product do