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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.
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. 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
relationship spanning
slicing
get_or_create(**kwargs)
filter

2. Lookup type that takes either True or False and corresponds to SQL queries of IS NULL and IS NOT NULL - respectively.
iregex
isnull
Field lookups
get_or_create(**kwargs)

3. If True - this field is the primary key for the model.
clear() method
many-to-one relationship
Custom model methods
primary_key

4. Lookup type that finds a case-insensitive regular expression match.
search
iregex
month
QuerySet

5. 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.
order_by(*fields)
ManyToManyField
latest(field_name=None)
when you add new apps to INSTALLED_APPS

6. Used to get a QuerySet for a model. This is called 'objects' by default.
none()
filter(**kwargs)
Manager
search

7. Manager method used to retrieve every object in a model.
choices tuple
add()
pickling
all()

8. 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)
Meta class
|
class type
Model metadata

9. This model method saves a model instance to the database. This method has no return value.
null
F()
Multi-table inheritance
save()

10. Defines a many-to-one relationship. ou use it just like any other Field type: by including it as a class attribute of your model.
ForeignKey
slicing
Restrictions on field names
order_by(*fields)

11. 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
intermediate models
using(alias)
isnull
ordered

12. 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.

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

13. 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.
Entry.objects.filter(pub_date__year=2007).update(headline='Everything is the same')
&
reverse()
MultipleObjectsReturned

14. This gives your model metadata.
exclude(**kwargs)
Entry.objects.filter(id__in=[1 - 3 - 4])
Meta class
select_related()

15. Lookup type that yields a case-insensitive match.
range
iexact
create(**kwargs)
ordered

16. This field is added automatically - but this behavior can be overridden
id field
exact
save()
Many-to-many relationship through an intermediate model

17. 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.
exact
dates(field - kind - order='ASC')
values_list(*fields)
get_absolute_url()

18. A QuerySet is iterable - and it executes its database query the first time you iterate over it.
iteration
exists()
delete()
contains

19. 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.
OneToOneField
using(alias)
update()
pickling

20. 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.
search
relationship spanning
choices tuple
gte

21. A Manager method that returns a new QuerySet containing objects that match the given lookup parameters.
filter(**kwargs)
lt
Restrictions on field names
iregex

22. Lookup type that returns results with a case-insensitive end sequence.
Proxy model
iendswith
help_text
count()

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

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24. 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
through argument
many-to-one relationship
count()
iterator()

25. 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.
Proxy model
filter(**kwargs)
delete()
defer(*fields)

26. Can be used to remove all many-to-many relationships for an instance
clear() method
pk
Many-to-many relationship to self
get_or_create(**kwargs)

27. This query finds all entries with an id greater than 4.
default
F()
save()
Entry.objects.filter(id__gt=4)

28. a QuerySet can be sliced - using Python's array-slicing syntax.
class attributes
slicing
values(*fields)
none()

29. These are specified as keyword arguments to the QuerySet methods filter() - exclude() and get(). These take the form field__lookuptype=value .
select_related()
|
iexact
Field lookups

30. 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.
iendswith
in_bulk(id_list)
lte
values(*fields)

31. Lookup type that tests for inclusion in a case-sensitive fashion.
contains
exact
evaluation
reverse name

32. 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.
Q(question__istartswith='What')
update()
get(**kwargs)
Field lookups

33. This query finds all entries between a start date of start_date and an end date of end_date.
distinct()
gte
endswith
Entry.objects.filter(pub_date__range=(start_date - end_date))

34. If this option is True - Django will store empty values as NULL in the database. Default is False.
null
istartswith
iendswith
MultipleObjectsReturned

35. Lookup type that returns results less than a given value.
lt
values(*fields)
pk
all()

36. This query uses an F object to increment the pingback count for every entry in the blog.

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

37. 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
through argument
count()
Entry.objects.filter(id__gt=4)
Many-to-many relationship through an intermediate model

38. If this option is True - the field is allowed to be blank. Default is False.
pickling
all()
blank
count()

39. This query finds all entries with an id in the list [1 - 3 - 4]
none()
values(*fields)
when you add new apps to INSTALLED_APPS
Entry.objects.filter(id__in=[1 - 3 - 4])

40. 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
==
create(**kwargs)
iregex
update(**kwargs)

41. 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.
model
OneToOneField
get_absolute_url()
db

42. 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.
exists()
exclude(**kwargs)
get_or_create(**kwargs)
using(alias)

43. 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

44. Returns the most recent object in the table - by date - using the field_name provided as the date field.
iexact
exact
help_text
latest(field_name=None)

45. Exception raised by get(**kwargs) if no items match the query.
get_or_create(**kwargs)
DoesNotExist
clear() method
defer(*fields)

46. This query deletes all Entry objects with a pub_date year of 2005.
null
OneToOneField
iregex
Entry.objects.filter(pub_date__year=2005).delete()

47. Lookup type that returns results with a case-insensitive start sequence.
when you add new apps to INSTALLED_APPS
default
istartswith
startswith

48. 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.
save()
extra(select=None - where=None - params=None - tables=None - order_by=None - select_params=None)
db
month

49. A Python "magic method" that returns a unicode "representation" of any object.
__unicode__()
Q(question__startswith='Who') | ~Q(pub_date__year=2005)
&
contains

50. 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
none()
class type
Proxy model
delete()