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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 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






2. 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






3. 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.






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






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






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






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






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






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






10. 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






11. 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






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






13. This represents a collection of objects from your database. It can have zero - one or many filters.






14. 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






15. 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.






16. Lookup type that returns results less than a given value.






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






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






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






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






21. When to run syncdb






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






23. These are specified as keyword arguments to the QuerySet methods filter() - exclude() and get(). These take the form field__lookuptype=value .






24. 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.






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






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






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






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






29. 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()






30. 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.






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






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






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






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






35. 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






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






37. 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.






38. 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






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






40. 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.






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. 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






43. To activate your models






44. 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


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






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






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






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






49. 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.






50. 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.