Merge pull request #11650 from prathamesh-sonpatki/rename

Renamed private methods _create_record and _update_record

Conflicts:
	activerecord/lib/active_record/persistence.rb
	activerecord/lib/active_record/relation.rb
	activerecord/test/cases/associations/belongs_to_associations_test.rb
Fix the test defining the models in the right place

Conflicts:
	activerecord/test/cases/associations/belongs_to_associations_test.rb
	activerecord/test/schema/schema.rb