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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. The value given in the absence of a specified value for the field. This can be a value or a callable object. If callable it will be called every time a new object is created.






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






3. Takes a list of primary-key values and returns a dictionary mapping each primary-key value to an instance of the object with the given ID.






4. (1) These cannot be Python reserved words - because that would result in a Python syntax error. (2) These cannot contain more than one underscore in a row - due to the way Django's query lookup syntax works.






5. A Q object that asks for entries with a question value that start with 'Who' or do not have a publication date of 2005.

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






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






8. 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.






9. This model method saves a model instance to the database. This method has no return value.






10. 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.






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






12. Returns a new QuerySet that uses SELECT DISTINCT in its SQL query. This eliminates duplicate rows from the query results.






13. 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.






14. Lookup type for date/datetime fields that finds a 'day of the week' match.






15. Fields are specified by these






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






17. Defined by django.db.models.ForeignKey. You use it just like any other Field type: by including it as a class attribute of your model.






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






19. 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






20. Sometimes - the Django query syntax by itself can't easily express a complex WHERE clause. For these edge cases - Django provides this QuerySet modifier -- a hook for injecting specific clauses into the SQL generated by a QuerySet.






21. 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






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






23. Disjunction operator for Q objects.






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






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






26. When to run syncdb






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






28. 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.






29. 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.






30. This method is for controlling which database the QuerySet will be evaluated against if you are using more than one database. The only argument this method takes is the alias of a database - as defined in DATABASES.






31. Returns a DateQuerySet -- a QuerySet that evaluates to a list of datetime.datetime objects representing all available dates of a particular kind within the contents of the QuerySet.

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






33. 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.






34. Lookup type that returns results greater than or equal to a given value.






35. Returns the object matching the given lookup parameters






36. Returns a QuerySet that will automatically "follow" foreign-key relationships - selecting that additional related-object data when it executes its query. This is a performance booster which results in (sometimes much) larger queries but means later u






37. Lookup type that returns results that fall into an inclusive date range.






38. To activate your models






39. If this option is True - the field is allowed to be blank. Default is False.






40. Lookup type that finds a case-sensitive regular expression match.






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






42. Lookup type for date/datetime fields that finds an exact month match. Takes an integer 1 (January) through 12






43. If True - the table does not permit duplicate values for this field.






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






45. 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.






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






47. 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.






48. Lookup type that returns results less than or equal to a given value.






49. 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.






50. This query finds all entries with an id in the list [1 - 3 - 4]