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Django Queryset

Subject : it-skills
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. By default - results returned by a QuerySet are ordered by the ordering tuple given by the ordering option in the model's Meta. You can override this on a per-QuerySet basis by using the this method.






2. The first element in this iterable is the value that will be stored in the database - the second element will be displayed by the admin interface - or in a ModelChoiceField.






3. Returns a new QuerySet containing objects that match the given lookup parameters.






4. Lookup type that tests for inclusion in a case-sensitive fashion.






5. Defines a many-to-many relationship. You use it just like any other Field type: by including it as a class attribute of your model.






6. This field is added automatically - but this behavior can be overridden






7. Returns the object matching the given lookup parameters






8. Accomplish this by using the field name of related fields across models - separated by double underscores - until you get to the field you want. For example - to get all Entry objects with a Blog whose name is 'Beatles Blog': Entry.objects.filter(blo






9. Used to get a QuerySet for a model. This is called 'objects' by default.






10. Lookup type that returns results with a case-sensitive end sequence.






11. Lookup type that returns results in a given list.






12. Each one of these is a Python class that subclasses django.db.models.Model. Each attribute of one of these represents a database field.






13. This query uses an F object to increment the pingback count for every entry in the blog.

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183


14. This tells Django how to calculate the URL for an object. Django uses this in its admin interface - and any time it needs to figure out a URL for an object.






15. These methods are intended to do "table-wide" things.






16. To activate your models






17. Disjunction operator for Q objects.






18. Lookup type for date/datetime fields that finds an exact day match.






19. A convenience method for looking up an object with the given kwargs - creating one if necessary.






20. This query finds all entries between a start date of start_date and an end date of end_date.






21. Conjuntion operator for Q objects.






22. An iterable (e.g. - a list or tuple) of 2-tuples to use as options for this field. If this is given - Django's admin will use a select box instead of the standard text field and will limit options to those given.






23. These add custom "row-level" functionality to your objects. These act on a particular model instance.






24. This query deletes all Entry objects with a pub_date year of 2005.






25. Takes the ouput of one filter and uses it as input for another filter. This works because a refinement of a QuerySet is itself a QuerySet.






26. Returns a dictionary of aggregate values (averages - sums - etc) calculated over the QuerySet. Each argument to this method specifies a value that will be included in the dictionary that is returned.






27. In this case - an intermediate model can have multiple foreign keys to the source model. Here - two foreign keys to the same model are permitted - but they will be treated as the two (different) sides of the many-to-many relation.






28. If you are using this attribute on a ForeignKey or ManyToManyField - you must always specify a unique reverse name for the field.






29. Negation operator for Q objects.






30. This object encapsulates a collection of keyword arguments - with the keys being field lookup types. These objects can be combined using the & and | operators - as well as negated with the ~ operator.






31. A manager method that returns a new QuerySet containing objects that do not match the given lookup parameters.






32. A Python "magic method" that returns a unicode "representation" of any object.






33. Returns an integer representing the number of objects in the database matching the QuerySet. This never raises exceptions.






34. If you pickle a QuerySet - this will force all the results to be loaded into memory prior to pickling. When you unpickle a QuerySet - it contains the results at the moment it was pickled - rather than the results that are currently in the database.






35. This model type is useful if you only want to modify the Python-level behavior of a model - without changing the models fields in any way. This creates a stand-in for the original model. You can create - delete and update instances of this new model






36. A manager method which returns a single object. If there are no results that match the query - this method will raise a DoesNotExist exception. If more than one item matches this query - the method will raise MultipleObjectsReturned.






37. The default for this is the name of the child class followed by '_set'.






38. This model method is used for updating a ManyToManyField.






39. A Q object that encapsulates queries for entries with a question value that starts with 'What' in a case-insensitive fashion.

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183


40. Defined by a ManyToManyField. You use it just like any other Field type: by including it as a class attribute of your model.






41. Lookup type that returns results with a case-insensitive end sequence.






42. This query finds all entries with an id greater than 4.






43. This is a criterion that narrow down a QuerySet based on given parameters.






44. Lookup type that returns results with a case-sensitive start sequence.






45. Performs an SQL update query for the specified fields - and returns the number of rows affected. This method is applied instantly and the only restriction on the QuerySet that is updated is that it can only update columns in the model's main table. F






46. Keyword shortcut for looking up an object by primary key.






47. A Manager method that returns a new QuerySet containing objects that match the given lookup parameters.






48. Returns the most recent object in the table - by date - using the field_name provided as the date field.






49. Fields are specified by these






50. Exception raised by get(**kwargs) if no items match the query.