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     Antipatterns

    1. A GET request with side-effects
    2. A model with a …Model suffix
    3. Chaining querysets together
    4. Checking ownership through the UserPassesTestMixin
    5. Checking request method with if request.POST
    6. Constructing a new form when validation fails
    7. Fetching the logged in user with a query
    8. Filtering in the template
    9. Foreign key with _id suffix
    10. Giving related_name=… the same name as the relation
    11. Manually constructing a slug
    12. Modifying slugs and primary keys of model objects
    13. (Over)use of .values()
    14. Passing parameters directly in the query string of a URL
    15. Plural model class names
    16. Refer to the User model directly
    17. Rendering content after a successful POST request
    18. Rendering into JavaScript
    19. Return a JsonResponse with safe=False
    20. Signals
    21. Use datetime.now as default=… for a created_on field
    22. Use .get(…) to retrieve the object in a view
    23. Using a FloatField for currencies
    24. Using commit=False when altering the instance in a ModelForm
    25. Using len(…) on a QuerySet with no further use
    26. Using multiple forms on the same page without prefixing
    27. Using regular HTML comments instead of Django template comments
    28. Using request.POST or None

     Patterns

    1. A SET(…) delete handler with the object as parameter
    2. Annotate a condition as BooleanField
    3. Date(Time)Fields that store a week or month
    4. Match multiple strings in a case-insensitive manner
    5. Set values to a created/updated object in a class-based view

     Troubleshooting

    1. A certain field does not appear in the migrations and in the database table
    2. Can not extract/filter a Date(Time)Field when time zones are enabled