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
[crayon-64cc43bdc827f065817020/]becomes the tidy
[crayon-64cc43bdc8284268839215/]…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:
gets cleaned to
[crayon-64cc43bdc8288635303413/]