ruby rails model url validation

Question

After a bunch of research and trying different gems I ended up rolling with the following:

  validates :url,
            presence: true,
            length: { maximum: 245 },
            format: { with: URI.regexp(%w(http https)), message: :bad_url_format }

This correctly validates the http:// and https:// prefixes but it allows any type of domain extension i.e. http://go.forever.

Is this considered normal?

Robert Nubel · Accepted Answer · 2016-02-17 21:49:13Z

1

Yes, that's normal for URL validations. Given the recent expansion of top-level domains to over one hundred, and the likelihood of that list to grow, it would be pretty cumbersome and brittle to try and enforce a list of allowed TLDs.

answered Feb 17, 2016 at 21:49

Robert Nubel

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Jeff · Accepted Answer · 2016-02-17 23:05:10Z

1

If you really wanted to validate the domain extension, I would do something along the lines of this.

Using a custom validation

validate :correct_url_extension

EXTENSIONS = %w(com org gov blah foo blah bar)

def correct_url_extension
  ext = url.split(".")[-1] #extension should always be at the end (parse here)
  return EXTENSIONS.include?(ext) ? true : false
end

answered Feb 17, 2016 at 23:05

Jeff

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