Add Rake task to rename Bogus gateways

Running

    rake solidus:migrations:rename_gateways:up

helps migrating your data to new bogus payment method class names.

    rake solidus:migrations:rename_gateways:down

reverts this.

Also includes a migration that invokes that task, so you don't need to care when deploying this change.

core/db/migrate/20170608074534_rename_bogus_gateways.rb

@@ -0,0 +1,13 @@
+class RenameBogusGateways < ActiveRecord::Migration[5.0]
+  def up
+    say_with_time 'Renaming bogus gateways into payment methods' do
+      Rake::Task['solidus:migrations:rename_gateways:up'].invoke
+    end
+  end
+
+  def down
+    say_with_time 'Renaming bogus payment methods into gateways' do
+      Rake::Task['solidus:migrations:rename_gateways:down'].invoke
+    end
+  end
+end

core/lib/solidus/migrations/rename_gateways.rb

@@ -0,0 +1,38 @@
+# frozen_string_literal: true
+
+module Solidus
+  module Migrations
+    class RenameGateways
+      DEFAULT_MAPPING = {
+        'Spree::Gateway::Bogus' => 'Spree::PaymentMethod::BogusCreditCard',
+        'Spree::Gateway::BogusSimple' => 'Spree::PaymentMethod::SimpleBogusCreditCard'
+      }
+
+      attr_reader :gateway_mapping
+
+      def initialize(gateway_mapping = DEFAULT_MAPPING)
+        @gateway_mapping = gateway_mapping
+      end
+
+      def up
+        gateway_mapping.inject(0) do |count, mapping|
+          count + update(from: mapping[0], to: mapping[1])
+        end
+      end
+
+      def down
+        gateway_mapping.inject(0) do |count, mapping|
+          count + update(from: mapping[1], to: mapping[0])
+        end
+      end
+
+      private
+
+      def update(from:, to:)
+        ActiveRecord::Base.connection.update <<-SQL.strip_heredoc
+          UPDATE spree_payment_methods SET type = '#{to}' WHERE type = '#{from}';
+        SQL
+      end
+    end
+  end
+end

core/lib/tasks/migrations/rename_gateways.rake

@@ -0,0 +1,19 @@
+require 'solidus/migrations/rename_gateways'
+
+namespace 'solidus:migrations:rename_gateways' do
+  task up: :environment do
+    count = Solidus::Migrations::RenameGateways.new.up
+
+    unless ENV['VERBOSE'] == 'false' || !verbose
+      puts "Renamed #{count} gateways into payment methods."
+    end
+  end
+
+  task down: :environment do
+    count = Solidus::Migrations::RenameGateways.new.down
+
+    unless ENV['VERBOSE'] == 'false' || !verbose
+      puts "Renamed #{count} payment methods into gateways."
+    end
+  end
+end