Advantages of the Django ORM
The ORM improves productivity with composable queries, model validation, and database abstraction.
- Readable query API
- Built-in escaping reduces SQL injection risk
- Easy relation traversal
Advantages of the Django ORM
Tagged with orm
6 cards
How do you avoid N+1 queries in Django?
Use relation-aware loading like select_related and prefetch_related when templates or loops will touch related objects repeatedly.
- Spot repeated per-row queries
- Load related data intentionally
- Profile before guessing
How do you avoid N+1 queries in Django?
select_related vs prefetch_related
select_related joins single-valued relations in SQL; prefetch_related fetches related collections in extra queries.
- select_related for FK and O2O
- prefetch_related for M2M and reverse FK
- Both reduce N+1 queries
select_related vs prefetch_related
What are Django model managers and QuerySet methods?
Managers and custom QuerySet methods let you package reusable query logic close to the model layer.
- Keeps query rules centralized
- Improves readability
- Good for domain-specific filters
What are Django model managers and QuerySet methods?
What is Django queryset laziness?
QuerySets are lazy, so they usually do not hit the database until they are evaluated.
- Filter chaining stays cheap
- Evaluation happens on iteration or list conversion
- Important for performance reasoning
What is Django queryset laziness?
What is the difference between get and filter in Django ORM?
`get()` expects exactly one row and raises errors otherwise, while `filter()` returns a QuerySet that can contain zero or more rows.
- get returns one object
- filter returns QuerySet
- Use get only when uniqueness is expected
What is the difference between get and filter in Django ORM?