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






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






3. 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






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






5. This class type is useful when you just want to use the parent class to hold information that you don't want to have to type out for each child model. This class isn't going to ever be used in isolation. When it is used as a base class for other mode






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






7. 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


8. 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






9. 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






10. 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.






11. Returns the object matching the given lookup parameters






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






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






14. 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.






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






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






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






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






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






20. 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






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






22. Lookup type that returns results greater than a given value.






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






24. Disjunction operator for Q objects.






25. 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.






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






27. 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






28. Lookup type that yields a case-insensitive match.






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






30. To activate your models






31. 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


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






33. When to run syncdb






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






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






36. 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






37. 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.






38. Returns True if the QuerySet contains any results - and False if not. This tries to perform the query in the simplest and fastest way possible - but it does execute nearly the same query. This means that calling this method on a queryset is faster th






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






40. 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.






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






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






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






44. 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.






45. 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






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






47. 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.






48. 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






49. 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


50. 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.