We can add our own validations adding new classes inheriting from ActiveModel::Validator or from ActiveModel::EachValidator.
Both methods are similar but they work in a slightly different ways:
ActiveModel::Validator and validates_with
Implement the validate method which takes a record as an argument and performs the validation on it. Then use validates_with with the class on the model.
If we prefer to use our new validator using the common validate method on a single param, create a class inheriting from ActiveModel::EachValidator and implement the validate_each method which takes three arguments: record, attribute, and value:
Validate that an attribute's value matches a regular expression using format and the with option.
We can also define a constant and set its value to a regular expression and pass it to the with: option. This might be more convenient for really complex regular expressions
Default error message is is invalid.
This can be changed with the :message option.
The reverse also replies, and you can specify that a value should not match a regular expression with the without: option
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