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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 convenience method for looking up an object with the given kwargs - creating one if necessary.






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






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






4. 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.






5. Fields are specified by these






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






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






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






9. 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






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






11. 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.






12. 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.






13. 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.






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






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






16. 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






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






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






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






20. 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.






21. 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.






22. 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






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






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






25. 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.






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






27. To activate your models






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






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






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






31. 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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32. 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.






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






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






35. 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






36. Disjunction operator for Q objects.






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






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






39. 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.






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






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






43. 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.






44. 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






45. 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






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






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






48. 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()






49. Lookup type for date/datetime fields that finds an exact day match.






50. 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