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






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






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






4. 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






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






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






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

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






9. A Q object that encapsulates queries for entries with a question value that starts with 'What' in a case-insensitive fashion.

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






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






12. A manager method which returns a single object. If there are no results that match the query - this method will raise a DoesNotExist exception. If more than one item matches this query - the method will raise MultipleObjectsReturned.






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






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






15. 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






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






17. 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






18. 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






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






20. 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.






21. 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.






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






23. 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)






24. (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.






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






26. 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.






27. 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.






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






29. Lookup type that corresponds to a boolean full-text search - taking advantage of full-text indexing. This is like contains but is significantly faster due to full-text indexing.






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






31. 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.






32. 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.






33. 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






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






35. 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






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






37. 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.






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






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






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






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






42. Returns the object matching the given lookup parameters






43. 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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44. This gives your model metadata.






45. 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.






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






47. 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.






48. Returns a QuerySet that will automatically "follow" foreign-key relationships - selecting that additional related-object data when it executes its query. This is a performance booster which results in (sometimes much) larger queries but means later u






49. 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.






50. 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.