>> m = Message.create
=> #<Message id: nil, text: nil, user_id: nil, created_at: nil, updated_at: nil, sound_file_name: nil, sound_content_type: nil, sound_file_size: nil, sound_updated_at: nil, title: nil, moderate: nil, image_file_name: nil, image_content_type: nil, image_file_size: nil>
>> m.check_for_message
=> ["Please add content (text, mp3, image' )"]
>> m.errors.full_messages
=> ["Tag list can't be blank", "Please add content (text, mp3, image' )"]
>> m.save
=> false
>> m.errors.full_messages
=> ["Tag list can't be blank"]
>> m.check_for_message
=> ["Please add content (text, mp3, image' )"]