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Comment by abledon | Hacker News Reader

Coming from Django , I was surprised rails 5.1 didn't come with authentication / authorization (or a valid email regexp)

I will definitely use this!

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> or a valid email regexp

In terms of standards, there's not a whole lot you can do beyond validate the domain if it includes one. You can take the HTML5 approach (https://developer.mozilla.org/en-US/docs/Web/HTML/Element/in...), but that means leaving out at least theoretically valid email addresses.

Huh? RFC 2822 describes in detail what a valid email address looks like. (There might be newer ones superseding it; that's the one that was current back when I looked into this topic.)

In practice, a lot of theoretically valid email addresses are rejected by implementations, e.g. my favorite:

  "@"@example.com

What's true, of course, is that you should never rely on an email address being syntactically correct. You should only use it after having done a validation process that involves sending mail to that address.

I agree with everything you're saying (though my favorite is probably addresses containing newlines). My point is just that in practice it's not terribly useful, e.g. why HTML5 defines its own: https://html.spec.whatwg.org/multipage/input.html#valid-e-ma....

Coming to Django, if you want to do auth via email instead of username, you are out of batteries. I say this criticism as a fan of both Django and Rails.

How do you like Django's DB migration system, how it will autogenerate ManyToMany tables etc..

i was astounded how much manual code is needed: http://jeffthomas.xyz/many-to-many-relationships-in-rails

It's about 20 loc to implement this in Django...

Edit: problem is that when starting a new project people often miss those 20 loc - as well as not noticing the documented best practices for accessing the user...

yeah, but i think by mentioning 'batteries' it means __no__ code is needed, simply a change in a config setting / changing a string to say.. 'username'-> 'email' somewhere.

> (or a valid email regexp)

I don't believe such a thing exists.

well, I enjoyed their attempt: https://docs.djangoproject.com/en/1.11/_modules/django/core/...

It looks better than most attempts I've seen, but there is an actual pedantically standards-compliant regex. I think it's somewhere on Stack Overflow, and its character count has five digits.

Ruby email validation gem: https://github.com/SixArm/sixarm_ruby_email_address_validati...

Feedback welcome. I'm the contact person for the gem.

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