Initial commit

db/migrate/20180529125011_replace_id_to_code.rb

@@ -0,0 +1,46 @@
+# frozen_string_literal: true
+
+class ReplaceIdToCode < ActiveRecord::Migration[4.2]
+  def up
+    ActiveRecord::Base.transaction do
+      change_column :currencies, :code, :string, limit: 10, null: false
+      change_column :currencies, :id, :string, limit: 10, null: false
+
+      change_column :deposits, :currency_id, :string, limit: 10
+      change_column :withdraws, :currency_id, :string, limit: 10
+      change_column :payment_addresses, :currency_id, :string, limit: 10
+      change_column :accounts, :currency_id, :string, limit: 10
+      change_column :proofs, :currency_id, :string, limit: 10
+      change_column :orders, :ask, :string, limit: 10
+      change_column :orders, :bid, :string, limit: 10
+
+      Currency.all.each do |c|
+        Deposits.where(currency_id: c.id).update_all(currency_id: c.code)
+        Withdraws.where(currency_id: c.id).update_all(currency_id: c.code)
+        PaymentAddresses.where(currency_id: c.id).update_all(currency_id: c.code)
+        Accounts.where(currency_id: c.id).update_all(currency_id: c.code)
+        Proofs.where(currency_id: c.id).update_all(currency_id: c.code)
+
+        %i[deposits withdraws payment_addresses accounts proofs].each do |t|
+          change_column t, :currency_id, :string, limit: 10
+        end
+
+        Orders.where(ask: c.id).update_all(ask: c.code)
+        Orders.where(bid: c.id).update_all(bid: c.code)
+      end
+
+      Currency.update_all('id = code')
+      remove_column :currencies, :code
+
+      if index_exists?(:currencies, %i[enabled code])
+        remove_index :currencies, column: %i[enabled code]
+      end
+
+      add_index :currencies, [:enabled]
+    end
+  end
+
+  def down
+    raise ActiveRecord::IrreversibleMigration, "This migration can't be rollbacked"
+  end
+end