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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. A QuerySet is iterable - and it executes its database query the first time you iterate over it.






2. 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.






3. 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.






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






5. Fields are specified by these






6. 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






7. 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.






8. 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.






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






10. 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


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






12. 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






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






14. 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.






15. 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.






16. Returns a dictionary of aggregate values (averages - sums - etc) calculated over the QuerySet. Each argument to this method specifies a value that will be included in the dictionary that is returned.






17. 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


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






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






20. 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.






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






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






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






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






25. 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.






26. 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.






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






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






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






30. 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.






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






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






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






34. 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)






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






36. 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.






37. 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






38. 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.






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






40. If this option is True - Django will store empty values as NULL in the database. Default is False.






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






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






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






44. 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.






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






46. Takes the ouput of one filter and uses it as input for another filter. This works because a refinement of a QuerySet is itself a QuerySet.






47. Lookup type that returns results less than or equal to a given value.






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






49. 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.






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







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