Merge pull request #36 from mapreal19/mario/fix-require-migration-rai…

…ls52

Fixes require migration for Rails 5.2

lib/migration_data/testing.rb

@@ -2,14 +2,22 @@
 
 def require_migration(migration_name)
   path = MigrationData::ActiveRecord::Migration.migration_dir
-  all_migrations = ActiveRecord::Migrator.migrations(path)
+  migrations = all_migrations(path)
 
   migration_name += '.rb' unless migration_name.end_with?('.rb')
-  file = all_migrations.detect do |m|
+  file = migrations.detect do |m|
     m.filename.end_with?(migration_name)
   end
 
   raise LoadError, "cannot load such file -- #{migration_name}" unless file
 
   require Rails.root.join(file.filename)
 end
+
+def all_migrations(path)
+  if Rails::VERSION::MAJOR >= 5 && Rails::VERSION::MINOR >= 2
+    ActiveRecord::MigrationContext.new(path).migrations
+  else
+    ActiveRecord::Migrator.migrations(path)
+  end
+end