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






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






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






4. 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.






5. Lookup type that returns results with a case-insensitive start sequence.






6. Lookup type that yields an "exact" match. If you don't provide a lookup type -- that is - if your keyword argument doesn't contain a double underscore -- the lookup type is assumed to be of this sort.






7. Negation operator for Q objects.






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

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9. 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






10. 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.






11. 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.






12. Lookup type that takes either True or False and corresponds to SQL queries of IS NULL and IS NOT NULL - respectively.






13. 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.






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






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






16. 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






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






18. Lookup type for date/datetime fields that finds an exact year match. Takes a four-digit year.






19. 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.






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






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






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






23. 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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24. 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






25. 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.






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






27. 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






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






29. To activate your models






30. 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.






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






32. 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.






33. Returns a ValuesQuerySet -- a QuerySet that returns dictionaries when used as an iterable - rather than model-instance objects.






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






35. 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.






36. 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)






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






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






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






40. 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.






41. 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.






42. 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






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






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






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






46. 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






47. Fields are specified by these






48. 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






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






50. Conjuntion operator for Q objects.