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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. 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.






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

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






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






5. Conjuntion operator for Q objects.






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






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






8. 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






9. Returns the object matching the given lookup parameters






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






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






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






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






14. In some complex data-modeling situations - your models might contain a lot of fields - some of which could contain a lot of data (for example - text fields) - or require expensive processing to convert them to Python objects. If you are using the res






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






16. 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






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






18. 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.






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






22. Negation operator for Q objects.






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






24. 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






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






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






27. 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.






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






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






31. This query uses an F object to increment the pingback count for every entry in the blog.

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32. Disjunction operator for Q objects.






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






34. 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






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






36. 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






37. 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.






38. 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.






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






40. 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.






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






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






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






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






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






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






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






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






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







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