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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. Lookup type that returns results with a case-insensitive end sequence.
iendswith
save()
id field
week_day

2. A QuerySet is iterable - and it executes its database query the first time you iterate over it.
create(**kwargs)
many-to-many relationship
OneToOneField
iteration

3. Manager method used to retrieve every object in a model.
all()
DoesNotExist
extra(select=None - where=None - params=None - tables=None - order_by=None - select_params=None)
reverse()

4. 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
exists()
when you add new apps to INSTALLED_APPS
choices
delete()

5. 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.
Q(question__istartswith='What')
edit your settings file and change the INSTALLED_APPS setting to add the name of the module that contains your models.py.
choices tuple
reverse name

6. Returns a new QuerySet containing objects that match the given lookup parameters.
==
exclude(**kwargs)
filter(**kwargs)
Model metadata

7. Fields are specified by these
model
choices tuple
exact
class attributes

8. Lookup type that returns results greater than a given value.
gt
class attributes
filter(**kwargs)
defer(*fields)

9. 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
Multi-table inheritance
Custom model methods
iterator()
in_bulk(id_list)

10. A convenience method for looking up an object with the given kwargs - creating one if necessary.
get_or_create(**kwargs)
annotate(args - *kwargs)
count()
get_absolute_url()

11. Lookup type that returns results with a case-insensitive start sequence.
istartswith
ManyToManyField
aggregate(args - *kwargs)
get(**kwargs)

12. Lookup type that returns results less than or equal to a given value.
Multi-table inheritance
blank
Restrictions on field names
lte

13. 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
annotate(args - *kwargs)
related_name
count()
ordered

14. 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
Q(question__istartswith='What')
filter(**kwargs)
in
update(**kwargs)

15. True if the QuerySet has an order_by() clause or a default ordering on the model. False otherwise.
year
day
ordered
extra(select=None - where=None - params=None - tables=None - order_by=None - select_params=None)

16. Defined by a ManyToManyField. You use it just like any other Field type: by including it as a class attribute of your model.
contains
when you add new apps to INSTALLED_APPS
many-to-many relationship
using(alias)

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
evaluation
class type
filter chaining
select_related()

18. 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.
regex
ManyToManyField
many-to-many relationship
class attributes

19. Lookup type that yields a case-insensitive match.
many-to-one relationship
gt
DoesNotExist
iexact

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
Proxy model
class attributes
id field
Many-to-many relationship through an intermediate model

21. This is a criterion that narrow down a QuerySet based on given parameters.
regex
delete()
values_list(*fields)
filter

22. This field is added automatically - but this behavior can be overridden
Manager
id field
get(**kwargs)
exclude(**kwargs)

23. 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.
get_absolute_url()
many-to-one relationship
regex
update(**kwargs)

24. 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.
intermediate models
Many-to-many relationship through an intermediate model
update(**kwargs)
Custom model methods

25. If you are using this attribute on a ForeignKey or ManyToManyField - you must always specify a unique reverse name for the field.
related_name
range
get(**kwargs)
Custom model methods

26. 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.
Entry.objects.filter(id__in=[1 - 3 - 4])
iregex
OneToOneField
Proxy model

27. This model method saves a model instance to the database. This method has no return value.
update()
blank
save()
ordered

28. 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.
&
Entry.objects.filter(pub_date__year=2007).update(headline='Everything is the same')
exact
get_or_create(**kwargs)

29. Lookup type that returns results greater than or equal to a given value.
iregex
gte
edit your settings file and change the INSTALLED_APPS setting to add the name of the module that contains your models.py.
get(**kwargs)

30. 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.
Multi-table inheritance
week_day
F()
get(**kwargs)

31. 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.
Multi-table inheritance
one-to-one relationship
select_related()
filter(**kwargs)

32. Lookup type for date/datetime fields that finds an exact year match. Takes a four-digit year.
Many-to-many relationship through an intermediate model
search
year
only(*fields)

33. Keyword shortcut for looking up an object by primary key.
Manager
pk
default
reverse name

34. 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.
update()
update(**kwargs)
Many-to-many relationship to self
delete()

35. 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.
values_list(*fields)
default
Meta class
Field lookups

36. Exception raised by get(**kwargs) if more than one item matches the query.
MultipleObjectsReturned
all()
get_absolute_url()
iterator()

37. Lookup type that tests for inclusion in a case-sensitive fashion.
__unicode__()
contains
F()
aggregate(args - *kwargs)

38. Can be used to remove all many-to-many relationships for an instance
add()
id field
through argument
clear() method

39. 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.
exclude(**kwargs)
help_text
add()
|

40. 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.
many-to-one relationship
month
gte
filter chaining

41. This query deletes all Entry objects with a pub_date year of 2005.
default
only(*fields)
order_by(*fields)
Entry.objects.filter(pub_date__year=2005).delete()

42. Disjunction operator for Q objects.
Proxy model
~
MultipleObjectsReturned
|

43. When to run syncdb
Entry.objects.all().update(n_pingbacks=F('n_pingbacks') + 1)
Entry.objects.filter(pub_date__year=2007).update(headline='Everything is the same')
when you add new apps to INSTALLED_APPS
defer(*fields)

44. 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

45. Lookup type that returns results that fall into an inclusive date range.
range
unique
add()
relationship spanning

46. 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.
delete()
update()
==
select_related()

47. 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

48. If this option is True - the field is allowed to be blank. Default is False.
none()
~
blank
F()

49. Returns a ValuesQuerySet -- a QuerySet that returns dictionaries when used as an iterable - rather than model-instance objects.
__unicode__()
reverse name
values(*fields)
class attributes

50. This model method is used for updating a ManyToManyField.
class type
get_absolute_url()
regex
add()