Test your basic knowledge |

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






2. 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.






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






4. Operator for comparing two model instances for equality. Behind the scenes - it compares the primary key values of two models.






5. restrictions on ________: (1) Your intermediate model must contain one - and only one - foreign key to the target model. (2) Your intermediate model must contain one - and only one - foreign key to the source model. (3) When defining a many-to-many r






6. When to run syncdb






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






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






9. If True - this field is the primary key for the model.






10. 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.






11. 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.






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

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


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






14. This style of inheritanc is useful when you're subclassing an existing model (perhaps something from another application entirely) and want each model to have its own database table. Here - each model in the hierarchy is a model all by itself.






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






16. 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.






17. Manager method used to retrieve every object in a model.






18. 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.






19. Disjunction operator for Q objects.






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






21. This method immediately deletes the object and has no return value.






22. This represents a collection of objects from your database. It can have zero - one or many filters.






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






24. These are specified as keyword arguments to the QuerySet methods filter() - exclude() and get(). These take the form field__lookuptype=value .






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






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






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






28. Lookup type that finds a case-insensitive regular expression match.






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. 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.






31. Returns the object matching the given lookup parameters






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






33. 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






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






35. Specifies the model that will be used to govern the many-to-many relationship. You can then put extra fields on the intermediate model. The intermediate model is associated with the ManyToManyField using this to point to the model that will act as an






36. 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.






37. 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






38. Returns an EmptyQuerySet -- a QuerySet that always evaluates to an empty list. This can be used in cases where you know that you should return an empty result set and your caller is expecting a QuerySet object (instead of returning an empty list - fo






39. (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.






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






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






42. 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


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






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






45. Can be used to remove all many-to-many relationships for an instance






46. 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.






47. 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.






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






49. what the field _______ determines: (1) The database column type (e.g. INTEGER - VARCHAR); (2) The widget to use in Django's admin interface - if you care to use it (e.g. <input type="text"> - <select>); (3) The minimal validation requirements - used






50. Adds to each object in the QuerySet with the provided list of aggregate values (averages - sums - etc) that have been computed over the objects that are related to the objects in the QuerySet. Each argument to this is content that will be added to ea