remove sale_discount from model list

app/models/sale_discount.rb

@@ -1,3 +0,0 @@
-class SaleDiscount < ApplicationRecord
-  belongs_to :sale
-end

db/migrate/20170403162221_create_sale_discounts.rb

@@ -1,13 +0,0 @@
-class CreateSaleDiscounts < ActiveRecord::Migration[5.0]
-  def change
-    create_table :sale_discounts do |t|
-      t.references :sale, foreign_key: true
-      t.string :discount_type, :null => false
-      t.decimal :discount_value, :precision => 10, :scale => 2, :null => false, :default => 0.00
-      t.decimal :discount_amount, :precision => 10, :scale => 2, :null => false, :default => 0.00
-      t.string :discount_code
-
-      t.timestamps
-    end
-  end
-end

spec/models/sale_discount_spec.rb

@@ -1,5 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe SaleDiscount, type: :model do
-  pending "add some examples to (or delete) #{__FILE__}"
-end