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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. This object allows you to compare the value of a model field with another field on the same model. Django supports the use of addition - subtraction - multiplication - division and modulo arithmetic with these objects - both with constants and with o






2. (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.






3. Extra text to be displayed under the field on the object's admin form to provide assistance to users. It's useful for documentation even if your object doesn't have an admin form.






4. 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






5. 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.






6. 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.






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






8. When to run syncdb






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






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






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






12. This method is more or less the opposite of defer(). You call it with the fields that should not be deferred when retrieving a model. If you have a model where almost all the fields need to be deferred - using this method to specify the complementary






13. Lookup type that corresponds to a boolean full-text search - taking advantage of full-text indexing. This is like contains but is significantly faster due to full-text indexing.






14. This method returns tuples of values when iterated over. Each tuple contains the value from the respective field passed into the call to this method -- so the first item is the first field - etc.






15. 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.






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






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






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






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






20. Exception raised by get(**kwargs) if more than one item matches the query.






21. 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.






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






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






24. A convenience method for constructing an object and saving it all in one step.






25. 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.






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






27. True if the QuerySet has an order_by() clause or a default ordering on the model. False otherwise.






28. Lookup type that returns results less than a given value.






29. Performs an SQL delete query on all rows in the QuerySet. This method is applied instantly. You cannot call this method on a QuerySet that has had a slice taken or can otherwise no longer be filtered.






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






31. Use this method to reverse the order in which a queryset's elements are returned. Calling this method a second time restores the ordering back to the normal direction.






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






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






34. a QuerySet can be sliced - using Python's array-slicing syntax.






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






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






37. This gives your model metadata.






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






39. 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.






40. These are "anything that's not a field" - such as ordering options (ordering) - database table name (db_table) - or human-readable singular and plural names (verbose_name and verbose_name_plural)






41. Evaluates the QuerySet (by performing the query) and returns an iterator over the results. A QuerySet typically caches its results internally so that repeated evaluations do not result in additional queries; this method will instead read results dire






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






43. Evaluation happens upon use the "step" parameter of slice syntax - the first time you iterate over it - when pickling or caching results - upon calling repr() - upon calling len() - upon calling list() - upon calling bool()






44. Returns a copy of the current QuerySet (or QuerySet subclass you pass in). This can be useful in some situations where you might want to pass in either a model manager or a QuerySet and do further filtering on the result. You can safely call all() on






45. Fields are specified by these






46. This query updates all the headlines with pub_date in 2007 to read 'Everything is the same'.

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


47. 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.






48. In some complex data-modeling situations - your models might contain a lot of fields - some of which could contain a lot of data (for example - text fields) - or require expensive processing to convert them to Python objects. If you are using the res






49. 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.






50. Disjunction operator for Q objects.