```ruby
class PhoneFormatValidator < ActiveModel::EachValidator
  def validate_each(record, attribute, value)
    if not value =~ /^([0-9\.+ -]+)$/i
      record.errors.add(attribute, "should only contain digits, period, plus sign, hyphen, and spaces")
    end
  end
end```

Add length validation to PhoneFormatValidator
user
```ruby
class PhoneFormatValidator < ActiveModel::EachValidator
  def validate_each(record, attribute, value)
    if not value =~ /^([0-9\.+ -]+)$/i
      record.errors.add(attribute, "should only contain digits, period, plus sign, hyphen, and spaces")
    end
    if value.gsub(/\D/, '').length > 10
      record.errors.add(attribute, "contains more than 10 numbers.  Please fix.")
    end
    if value.gsub(/\D/, '').length < 10
      record.errors.add(attribute, "contains fewer than 10 numbers.  Please fix.")
    end
  end
end```
assistant