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






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






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






4. Returns the object matching the given lookup parameters






5. 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






6. 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






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






8. 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.






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






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






13. 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.






14. Disjunction operator for Q objects.






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






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






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






18. 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






19. When to run syncdb






20. 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.






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






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






23. 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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24. 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






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






26. By default - results returned by a QuerySet are ordered by the ordering tuple given by the ordering option in the model's Meta. You can override this on a per-QuerySet basis by using the this method.






27. If True - the table does not permit duplicate values for this field.






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






29. 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.






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






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






32. 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.






33. 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






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






35. This gives your model metadata.






36. 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.






37. 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.






38. 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






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






40. 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.






41. 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.






42. 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






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






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






45. 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.






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






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






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






49. 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






50. 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.







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