The validation option
:length checks the length of a model attribute. Add validation to the product model to check that the title is at least ten characters long.
Hint: you can find an example in the API documentation.
Change the error message associated with one of your validations.
Hint: the generic
validates method simply calls a more specific
validate_xxx method to handle the request, passing along any arguments that it receives. You can see examples of passing error messages in the API documentation for some of the more specific methods.