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Python Customizing Django Templates Building Custom Filters Chaining Filters

Posted by Patrick Bluth
Patrick Bluth
13,285 Points

Best practices for naming filters

I notice the built-in filters are written as one word, ie 'wordcount', 'linebreaks' etc, but the one we made was written using an underscore; 'time_estimate'

Is one style preferred over the other?

1 Answer

Chris Freeman
MOD
Chris Freeman
Treehouse Moderator 68,441 Points
Chris Freeman
Chris Freeman
Treehouse Moderator 68,441 Points

Great question. There doesn't seem to be a hard rule. The list of built-in filters appear to be mostly single word with no underscores. The ones with underscores seem to fall into two camps:

  • filters that are extensions of other filters: truncatewords v. truncatewords_html
  • filters that have a verb /noun combination: make_list, get_digit

But why truncatewords isn't truncate_words breaks the pattern. Maybe to avoid a double underscore for truncate_words_html. So both time_estimate and timeestimate work. Perhaps it depends on which you find more readable.

Patrick Bluth
Patrick Bluth
13,285 Points

Awesome thanks a lot for clearing that up!