delete

delete is used to delete an object.

Behavior

• Delete only delete one and only one object.
  • Service DON'T NEED to support remove all.
  • User NEED to implement remove_all by themself.
• Delete is idempotent.
  • Successful delete always return nil error.
  • Delete SHOULD never return ObjectNotExist
  • Delete DON'T NEED to check the object exist or not.