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Django Queryset

Subject : it-skills
Instructions:
  • Answer 50 questions in 15 minutes.
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  • Match each statement with the correct term.
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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. The database that will be used if this query is executed now






2. 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






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






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






5. 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






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






7. Lookup type that returns results with a case-sensitive start sequence.






8. 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.






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






10. 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.






11. 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.






12. 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.






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






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






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






16. These are "anything that's not a field" - such as ordering options (ordering) - database table name (db_table) - or human-readable singular and plural names (verbose_name and verbose_name_plural)






17. This sets a field to a particular value for all the objects in a QuerySet. You can only set non-relation fields and ForeignKey fields using this method.






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






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






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






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






22. This gives your model metadata.






23. 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.






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






25. Evaluates the QuerySet (by performing the query) and returns an iterator over the results. A QuerySet typically caches its results internally so that repeated evaluations do not result in additional queries; this method will instead read results dire






26. 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.






27. 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.






28. 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






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






30. 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.






31. 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.






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






34. 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






35. (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.






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






37. 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()






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






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






40. 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






41. 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.






42. 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.






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






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






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






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






47. 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






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






49. 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






50. 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.