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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. 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.






2. 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






3. Disjunction operator for Q objects.






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

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






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






7. 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.






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






9. Returns the object matching the given lookup parameters






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






11. 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






12. When to run syncdb






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






14. 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.






15. 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






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






17. 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






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






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






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






21. 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






22. To activate your models






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






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






25. Evaluation happens upon use the "step" parameter of slice syntax - the first time you iterate over it - when pickling or caching results - upon calling repr() - upon calling len() - upon calling list() - upon calling bool()






26. 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.






27. In this case - an intermediate model can have multiple foreign keys to the source model. Here - two foreign keys to the same model are permitted - but they will be treated as the two (different) sides of the many-to-many relation.






28. 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.






29. 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






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






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






32. 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.






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






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






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

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36. 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






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






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






39. 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.






40. 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.






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






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






43. 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






44. 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.






45. (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.






46. 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.






47. 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.






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






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






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