This post was published more than a few years ago (on 2014-06-01) and may contain inaccurate technical information, outmoded thoughts, or cringe takes. Proceed at your own risk.
I’m building a website, and needed a way to save a list of pages and page ranges from a book or magazine. I wanted to to be a little more strict than just saving it as a string without any cleanup or validation, so I wrote a custom Django model field (and accompanying form field).
It either just validates and cleans so that
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4-33, 43, 45, 60-65, 44, 59 |
becomes the tidy
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1 2 |
4-33, 43-45, 59-65 |
…or, if you comment out the raising of the ValidationError in the form field’s validate() method, it will actually clean up any junk characters for you, so even this horrible mess:
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;4-33, 46a fads i44 ,p45o |
gets cleaned to
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1 2 |
4-33, 44-46 |