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Test your basic knowledge |
Django Queryset
Start Test
Study First
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. 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.
day
delete()
evaluation
choices tuple
2. 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.
update()
Entry.objects.filter(pub_date__range=(start_date - end_date))
relationship spanning
model
3. Disjunction operator for Q objects.
null
year
DoesNotExist
|
4. If you pickle a QuerySet - this will force all the results to be loaded into memory prior to pickling. When you unpickle a QuerySet - it contains the results at the moment it was pickled - rather than the results that are currently in the database.
day
pickling
pk
contains
5. Lookup type that returns results with a case-sensitive end sequence.
Manager
Entry.objects.filter(id__gt=4)
endswith
many-to-one relationship
6. The default for this is the name of the child class followed by '_set'.
iteration
filter chaining
reverse name
annotate(args - *kwargs)
7. Manager method used to retrieve every object in a model.
distinct()
all()
Many-to-many relationship to self
only(*fields)
8. Fields are specified by these
exists()
class attributes
get_absolute_url()
only(*fields)
9. Lookup type that returns results that fall into an inclusive date range.
pickling
range
&
Entry.objects.filter(pub_date__year=2005).delete()
10. Operator for comparing two model instances for equality. Behind the scenes - it compares the primary key values of two models.
all()
F()
==
get_or_create(**kwargs)
11. 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
edit your settings file and change the INSTALLED_APPS setting to add the name of the module that contains your models.py.
filter(**kwargs)
annotate(args - *kwargs)
filter(**kwargs)
12. (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.
Restrictions on field names
Abstract base class
F()
create(**kwargs)
13. 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
filter(**kwargs)
add()
only(*fields)
all()
14. 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
Entry.objects.filter(pub_date__year=2007).update(headline='Everything is the same')
intermediate models
blank
==
15. A Python "magic method" that returns a unicode "representation" of any object.
latest(field_name=None)
filter chaining
__unicode__()
Custom model methods
16. 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
istartswith
contains
Meta class
all()
17. Lookup type that finds a case-sensitive regular expression match.
regex
defer(*fields)
Entry.objects.filter(id__gt=4)
edit your settings file and change the INSTALLED_APPS setting to add the name of the module that contains your models.py.
18. 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.
delete()
filter
default
Manager
19. 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.
in_bulk(id_list)
get(**kwargs)
gt
pickling
20. 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
21. Lookup type that takes either True or False and corresponds to SQL queries of IS NULL and IS NOT NULL - respectively.
isnull
ForeignKey
select_related()
Entry.objects.filter(pub_date__year=2007).update(headline='Everything is the same')
22. Lookup type that returns results with a case-insensitive start sequence.
get(**kwargs)
all()
many-to-many relationship
istartswith
23. Exception raised by get(**kwargs) if more than one item matches the query.
Entry.objects.filter(pub_date__year=2005).delete()
values_list(*fields)
Meta class
MultipleObjectsReturned
24. 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.
filter(**kwargs)
get_absolute_url()
==
latest(field_name=None)
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
Q(question__istartswith='What')
ordered
Restrictions on field names
26. 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
clear() method
Q(question__startswith='Who') | ~Q(pub_date__year=2005)
regex
iterator()
27. Returns a ValuesQuerySet -- a QuerySet that returns dictionaries when used as an iterable - rather than model-instance objects.
all()
values(*fields)
values_list(*fields)
choices tuple
28. 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
29. Lookup type for date/datetime fields that finds an exact year match. Takes a four-digit year.
year
update()
defer(*fields)
~
30. Defined by a ManyToManyField. You use it just like any other Field type: by including it as a class attribute of your model.
delete()
extra(select=None - where=None - params=None - tables=None - order_by=None - select_params=None)
help_text
many-to-many relationship
31. Lookup type that returns results greater than or equal to a given value.
gte
week_day
isnull
startswith
32. 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
gte
filter
get(**kwargs)
33. Lookup type that returns results less than a given value.
pickling
distinct()
get_absolute_url()
lt
34. 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()
year
latest(field_name=None)
exact
35. 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.
get(**kwargs)
get_absolute_url()
reverse()
in
36. Lookup type for date/datetime fields that finds a 'day of the week' match.
defer(*fields)
week_day
latest(field_name=None)
ForeignKey
37. Lookup type that returns results with a case-sensitive start sequence.
many-to-many relationship
iregex
~
startswith
38. 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.
isnull
many-to-many relationship
many-to-one relationship
~
39. The database that will be used if this query is executed now
clear() method
help_text
Model metadata
db
40. 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)
Model metadata
Multi-table inheritance
save()
|
41. This method immediately deletes the object and has no return value.
slicing
class attributes
delete()
order_by(*fields)
42. 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
week_day
relationship spanning
Abstract base class
create(**kwargs)
43. Lookup type that returns results greater than a given value.
count()
only(*fields)
values(*fields)
gt
44. 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.
save()
exact
db
order_by(*fields)
45. Negation operator for Q objects.
~
delete()
iteration
none()
46. Lookup type that finds a case-insensitive regular expression match.
iregex
count()
save()
filter chaining
47. Defined by a OneToOneField. You use it just like any other Field type: by including it as a class attribute of your model.
filter
one-to-one relationship
edit your settings file and change the INSTALLED_APPS setting to add the name of the module that contains your models.py.
reverse()
48. 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.
ManyToManyField
Entry.objects.filter(pub_date__range=(start_date - end_date))
annotate(args - *kwargs)
Q()
49. If this option is True - the field is allowed to be blank. Default is False.
search
blank
reverse()
exact
50. This query finds all entries between a start date of start_date and an end date of end_date.
db
startswith
all()
Entry.objects.filter(pub_date__range=(start_date - end_date))
Sorry!:) No result found.
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