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Django Queryset

Subject : it-skills
Instructions:
  • Answer 50 questions in 15 minutes.
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  • 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 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.






2. This sets a field to a particular value for all the objects in a QuerySet. You can only set non-relation fields and ForeignKey fields using this method.






3. Disjunction operator for Q objects.






4. 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.






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






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






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






8. Fields are specified by these






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






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






11. 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






12. (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.






13. 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






14. 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






15. A Python "magic method" that returns a unicode "representation" of any object.






16. 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






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






18. 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.






19. 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.






20. 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.

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


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






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






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






24. 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.






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






26. 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






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






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






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






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






32. 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






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






34. 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






35. 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.






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






37. Lookup type that returns results with a case-sensitive start sequence.






38. 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.






39. The database that will be used if this query is executed now






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






42. 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






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






44. 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.






45. Negation operator for Q objects.






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






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






48. 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.






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






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







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