Question

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How to make case insensitive filter queries with Google App Engine?

Currently on my web app,

If I type in http://www.website.com/Rohit , it takes me to my desired profile page.

But if I type in http://www.website.com/rohit , it does not take me there, and it gets sent to the 404 error.

Basically, my username is stored as: Rohit

And any given user’s profile page is supposed to be: http://www.website.com/username

But I want the website to not care about capitals.

UPDATE

I now know, thanks to Martijn that my regex expression is ok. This is the code, I use to check Google App Engine to see if a username already exists or not:

u = User.all().filter('username =', username).get()

^How do I make this capitals-friendly (capital letters don’t make a difference?)

Answer 1

use filter('username =', username.lower()) to convert to lowercase beforehand.

and you need to convert your database, changing all user names to lowercase as well:

users = User.all().fetch(1000000)
for user in users :
    if user.username != user.username.lower() :
        user.username = user.username.lower()
        user.put()  # save back to db only if changed

you may run this from interactive console, using fetch(offset,count) to adjust the amount of users converted in one run.