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






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






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






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






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






6. 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.






7. 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.






8. 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.






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






10. 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






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






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






13. 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.






14. Conjuntion operator for Q objects.






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






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






17. 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


18. 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.






19. Here - you can't use add - create - or assignment (i.e. - beatles.members = [...]) to create relationships. You need to specify all the detail for the relationship required by the intermediate model.






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






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






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






23. 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.






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. 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


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






27. 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


28. 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.






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






30. Lookup type that tests for inclusion in a case-sensitive fashion.






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






32. 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






33. 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.






34. 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.






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






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






37. 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






38. 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






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






40. 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.






41. 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.






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






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






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






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






46. 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






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






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






49. 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.






50. Returns a new QuerySet that uses SELECT DISTINCT in its SQL query. This eliminates duplicate rows from the query results.







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