Test your basic knowledge |

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. 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
using(alias)
through argument
delete()
Q()

2. This gives your model metadata.
in
iteration
distinct()
Meta class

3. This query deletes all Entry objects with a pub_date year of 2005.
range
Entry.objects.filter(pub_date__year=2005).delete()
OneToOneField
unique

4. Lookup type that returns results with a case-insensitive end sequence.
&
Proxy model
values(*fields)
iendswith

5. Disjunction operator for Q objects.
|
iregex
ManyToManyField
all()

6. Defined by a ManyToManyField. You use it just like any other Field type: by including it as a class attribute of your model.
many-to-many relationship
get_or_create(**kwargs)
db
__unicode__()

7. Returns a new QuerySet that uses SELECT DISTINCT in its SQL query. This eliminates duplicate rows from the query results.
filter
QuerySet
distinct()
many-to-one relationship

8. A convenience method for constructing an object and saving it all in one step.
Custom model methods
ForeignKey
create(**kwargs)
values_list(*fields)

9. 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.
Q()
gte
search
Multi-table inheritance

10. 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
get_absolute_url()
save()
gt
Proxy model

11. A Python "magic method" that returns a unicode "representation" of any object.
DoesNotExist
reverse name
__unicode__()
Meta class

12. These are specified as keyword arguments to the QuerySet methods filter() - exclude() and get(). These take the form field__lookuptype=value .
in
Field lookups
dates(field - kind - order='ASC')
pk

13. Returns a new QuerySet containing objects that match the given lookup parameters.
lte
OneToOneField
filter(**kwargs)
|

14. Defined by a OneToOneField. You use it just like any other Field type: by including it as a class attribute of your model.
get(**kwargs)
all()
create(**kwargs)
one-to-one relationship

15. 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.
iendswith
Many-to-many relationship through an intermediate model
OneToOneField
&

16. Used to get a QuerySet for a model. This is called 'objects' by default.
create(**kwargs)
Manager
save()
edit your settings file and change the INSTALLED_APPS setting to add the name of the module that contains your models.py.

17. 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
values(*fields)
relationship spanning
only(*fields)
contains

18. This model method is used for updating a ManyToManyField.
add()
select_related()
default
contains

19. Exception raised by get(**kwargs) if no items match the query.
DoesNotExist
update()
QuerySet
in_bulk(id_list)

20. Lookup type for date/datetime fields that finds an exact year match. Takes a four-digit year.
many-to-one relationship
year
ordered
extra(select=None - where=None - params=None - tables=None - order_by=None - select_params=None)

21. 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.
Entry.objects.filter(id__gt=4)
choices tuple
using(alias)
Many-to-many relationship to self

22. This method is more or less the opposite of defer(). You call it with the fields that should not be deferred when retrieving a model. If you have a model where almost all the fields need to be deferred - using this method to specify the complementary
pk
only(*fields)
get_or_create(**kwargs)
count()

23. True if the QuerySet has an order_by() clause or a default ordering on the model. False otherwise.
iexact
in_bulk(id_list)
ordered
iteration

24. A Q object that encapsulates queries for entries with a question value that starts with 'What' in a case-insensitive fashion.

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

25. A manager method that returns a new QuerySet containing objects that do not match the given lookup parameters.
QuerySet
aggregate(args - *kwargs)
Entry.objects.filter(pub_date__year=2007).update(headline='Everything is the same')
exclude(**kwargs)

26. 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.
reverse()
ordered
iteration
extra(select=None - where=None - params=None - tables=None - order_by=None - select_params=None)

27. If True - this field is the primary key for the model.
clear() method
annotate(args - *kwargs)
iexact
primary_key

28. This query finds all entries with an id in the list [1 - 3 - 4]
get_or_create(**kwargs)
Entry.objects.filter(id__in=[1 - 3 - 4])
choices tuple
Entry.objects.all().update(n_pingbacks=F('n_pingbacks') + 1)

29. Lookup type that returns results greater than or equal to a given value.
==
gte
none()
&

30. If this option is True - the field is allowed to be blank. Default is False.
filter chaining
ordered
blank
Entry.objects.filter(id__in=[1 - 3 - 4])

31. Operator for comparing two model instances for equality. Behind the scenes - it compares the primary key values of two models.
exists()
only(*fields)
all()
==

32. 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.
gte
all()
db
ManyToManyField

33. A Manager method that returns a new QuerySet containing objects that match the given lookup parameters.
Entry.objects.all().update(n_pingbacks=F('n_pingbacks') + 1)
Entry.objects.filter(pub_date__year=2007).update(headline='Everything is the same')
save()
filter(**kwargs)

34. 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

35. This represents a collection of objects from your database. It can have zero - one or many filters.
values(*fields)
week_day
QuerySet
delete()

36. 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
through argument
ordered
default
annotate(args - *kwargs)

37. 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
lt
distinct()
update(**kwargs)
Restrictions on field names

38. Lookup type that takes either True or False and corresponds to SQL queries of IS NULL and IS NOT NULL - respectively.
Abstract base class
clear() method
pickling
isnull

39. (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.
in
reverse()
primary_key
Restrictions on field names

40. 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
db
DoesNotExist
~
all()

41. 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)
class attributes
Model metadata
one-to-one relationship
in_bulk(id_list)

42. 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.
default
gt
choices tuple
pk

43. Here - you can't use add - create - or assignment (i.e. - beatles.members = [...]) to create relationships. You need to specify all the detail for the relationship required by the intermediate model.
Model metadata
F()
Many-to-many relationship through an intermediate model
help_text

44. 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.
add()
filter chaining
dates(field - kind - order='ASC')
iendswith

45. Fields are specified by these
class attributes
id field
related_name
Restrictions on field names

46. If you are using this attribute on a ForeignKey or ManyToManyField - you must always specify a unique reverse name for the field.
default
add()
related_name
reverse name

47. Returns the object matching the given lookup parameters
year
get(**kwargs)
delete()
filter(**kwargs)

48. Manager method used to retrieve every object in a model.
all()
contains
primary_key
select_related()

49. A convenience method for looking up an object with the given kwargs - creating one if necessary.
only(*fields)
reverse name
&
get_or_create(**kwargs)

50. To activate your models
regex
edit your settings file and change the INSTALLED_APPS setting to add the name of the module that contains your models.py.
unique
isnull