Defining Column Validator

The prototype of Column::validator method:

Column::validator(string functionName | Closure | Validator Name provided from ValidationKit)

To define a validator for a column in the schema, you may pass a Closure to customize your validation logics:

        $this->column('address')
            ->varchar(64)
            ->validator(function ($val, $args) {
                if (strlen($val) < 6) {
                    return [false , "The given address is not clear enough"];
                }
                return [true , "Good address"];
            })

The closure used for validating value should return a 2 element array as the result, the first element needs to be a boolean value, true means the validation succeed, false means the validation failed, the second element needs to be a string, it presents the reason describing why the validation failed or succeed.