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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 match the given lookup parameters.






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






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






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






5. 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.






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






7. 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






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






9. This style of inheritanc is useful when you're subclassing an existing model (perhaps something from another application entirely) and want each model to have its own database table. Here - each model in the hierarchy is a model all by itself.






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






11. 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






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






13. 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






14. 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






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






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. 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






18. Lookup type that returns results greater than a given value.






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






20. 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






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






22. (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.






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






24. 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.






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






26. 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.






27. 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.






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






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






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






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






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






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






34. To activate your models






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






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






37. A Q object that asks for entries with a question value that start with 'Who' or do not have a publication date of 2005.

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


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






39. 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


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






41. 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.






42. 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.






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






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






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






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






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






49. 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.






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