Django ORM Cookbook
  • Introduction
  • 1. How to find the query associated with a queryset?
  • 2. How to do OR queries in Django ORM?
  • 3. How to do AND queries in Django ORM?
  • 4. How to do a NOT query in Django queryset?
  • 5. How to do union of two querysets from same or different models?
  • 6. How to select some fields only in a queryset?
  • 7. How to do a subquery expression in Django?
  • 8. How to filter a queryset with criteria based on comparing their field values
  • 9. How to filter FileField without any file?
  • 10. How to perform join operations in django ORM?
  • 11. How to find second largest record using Django ORM ?
  • 12. Find rows which have duplicate field values
  • 13. How to find distinct field values from queryset?
  • 14. How to use Q objects for complex queries?
  • 15. How to group records in Django ORM?
  • 16. How to efficiently select a random object from a model?
  • 17. How to use arbitrary database functions in querysets?
  • 1. How to create multiple objects in one shot?
  • 2. How to copy or clone an existing model object?
  • 3. How to ensure that only one object can be created?
  • 4. How to update denormalized fields in other models on save?
  • 5. How to perform truncate like operation using Django ORM?
  • 6. What signals are raised by Django during object creation or update?
  • 7. How to convert string to datetime and store in database?
  • 1. How to order a queryset in ascending or descending order?
  • 2. How to order a queryset in case insensitive manner?
  • 3. How to order on two fields
  • 4. How to order on a field from a related model (with a foreign key)?
  • 5. How to order on an annotated field?
  • 1. How to model one to one relationships?
  • 2. How to model one to many relationships?
  • 3. How to model many to many relationships?
  • 4. How to include a self-referencing ForeignKey in a model
  • 5. How to convert existing databases to Django models?
  • 6. How to add a model for a database view?
  • 7. How to create a generic model which can be related to any kind of entity? (Eg. a Category or a Comment?)
  • 8. How to specify the table name for a model?
  • 9. How to specify the column name for model field?
  • 10. What is the difference between null=True and blank=True?
  • 11. How to use a UUID instead of ID as primary key?
  • 12. How to use slug field with django for more readability?
  • 13. How to add multiple databases to the django application ?
  • 1. How to assert that a function used a fixed number of queries?
  • 2. How to speed tests by reusing database between test runs?
  • 3. How to reload a model object from the database?
Django ORM Cookbook
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