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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. When to run syncdb






2. 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






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






4. Negation operator for Q objects.






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






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

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183


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






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






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






10. Adds to each object in the QuerySet with the provided list of aggregate values (averages - sums - etc) that have been computed over the objects that are related to the objects in the QuerySet. Each argument to this is content that will be added to ea






11. 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.






12. 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






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






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






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






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






17. 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






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






19. 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.






20. 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






21. 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.






22. 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






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






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






25. 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






26. 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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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 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.






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






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






31. Fields are specified by these






32. 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.






33. 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






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






35. 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.






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






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






38. 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






39. 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.






40. 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






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






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






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






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. 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.






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. 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






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






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






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






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