Add validations to these models such that...
Finally, add a custom validator to Post
that ensures the title is
sufficiently clickbait-y. If the title does not contain "Won't Believe",
"Secret", "Top [number]", or "Guess", the validator should add a validation.
Use the Custom methods style of validator found in the Rails documentation.
View ActiveRecord Validations Lab on Learn.co and start learning to code for free.