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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. 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.
id field
default
OneToOneField
Manager methods
2. This query updates all the headlines with pub_date in 2007 to read 'Everything is the same'.
Warning
: Invalid argument supplied for foreach() in
/var/www/html/basicversity.com/show_quiz.php
on line
183
3. Each one of these is a Python class that subclasses django.db.models.Model. Each attribute of one of these represents a database field.
model
many-to-one relationship
&
using(alias)
4. Lookup type that tests for inclusion in a case-sensitive fashion.
clear() method
get(**kwargs)
contains
choices tuple
5. Conjuntion operator for Q objects.
update(**kwargs)
reverse()
&
Restrictions on field names
6. Used to get a QuerySet for a model. This is called 'objects' by default.
Manager
__unicode__()
Custom model methods
iteration
7. A Manager method that returns a new QuerySet containing objects that match the given lookup parameters.
delete()
all()
filter(**kwargs)
Q(question__startswith='Who') | ~Q(pub_date__year=2005)
8. This object allows you to compare the value of a model field with another field on the same model. Django supports the use of addition - subtraction - multiplication - division and modulo arithmetic with these objects - both with constants and with o
Entry.objects.filter(id__in=[1 - 3 - 4])
OneToOneField
DoesNotExist
F()
9. Returns the object matching the given lookup parameters
get(**kwargs)
values_list(*fields)
iregex
evaluation
10. Lookup type that takes either True or False and corresponds to SQL queries of IS NULL and IS NOT NULL - respectively.
&
isnull
distinct()
exclude(**kwargs)
11. Can be used to remove all many-to-many relationships for an instance
default
clear() method
month
blank
12. If you are using this attribute on a ForeignKey or ManyToManyField - you must always specify a unique reverse name for the field.
evaluation
Many-to-many relationship to self
contains
related_name
13. Lookup type that returns results less than or equal to a given value.
evaluation
choices tuple
gt
lte
14. 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
defer(*fields)
day
using(alias)
Entry.objects.filter(id__gt=4)
15. If True - this field is the primary key for the model.
DoesNotExist
delete()
lt
primary_key
16. 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
only(*fields)
db
year
Custom model methods
17. This query finds all entries with an id greater than 4.
order_by(*fields)
class type
choices tuple
Entry.objects.filter(id__gt=4)
18. 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()
filter chaining
update()
Meta class
19. 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
20. 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.
latest(field_name=None)
Multi-table inheritance
reverse()
regex
21. Lookup type for date/datetime fields that finds a 'day of the week' match.
pickling
id field
get_or_create(**kwargs)
week_day
22. Negation operator for Q objects.
~
day
ForeignKey
help_text
23. These methods are intended to do "table-wide" things.
defer(*fields)
Manager methods
blank
in
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
values(*fields)
regex
iterator()
choices tuple
25. A Python "magic method" that returns a unicode "representation" of any object.
__unicode__()
all()
Multi-table inheritance
Custom model methods
26. Lookup type that returns results with a case-insensitive start sequence.
null
many-to-many relationship
istartswith
Entry.objects.filter(id__gt=4)
27. 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
choices tuple
exclude(**kwargs)
Entry.objects.filter(pub_date__year=2005).delete()
28. Lookup type that returns results greater than or equal to a given value.
gte
filter(**kwargs)
Field lookups
year
29. 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
30. a QuerySet can be sliced - using Python's array-slicing syntax.
Entry.objects.filter(id__gt=4)
slicing
Meta class
lte
31. 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
32. Disjunction operator for Q objects.
F()
iteration
gte
|
33. This is a criterion that narrow down a QuerySet based on given parameters.
default
MultipleObjectsReturned
Field lookups
filter
34. 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
relationship spanning
Entry.objects.filter(pub_date__range=(start_date - end_date))
update(**kwargs)
get_or_create(**kwargs)
35. Returns an integer representing the number of objects in the database matching the QuerySet. This never raises exceptions.
Restrictions on field names
count()
Manager methods
exists()
36. 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
Manager methods
Proxy model
lt
Q(question__istartswith='What')
37. 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.
choices
ManyToManyField
contains
day
38. 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.
save()
aggregate(args - *kwargs)
pickling
delete()
39. Returns a new QuerySet containing objects that match the given lookup parameters.
filter(**kwargs)
Entry.objects.filter(pub_date__range=(start_date - end_date))
db
ordered
40. 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.
many-to-one relationship
count()
Abstract base class
using(alias)
41. Returns the most recent object in the table - by date - using the field_name provided as the date field.
Manager
isnull
aggregate(args - *kwargs)
latest(field_name=None)
42. Returns a ValuesQuerySet -- a QuerySet that returns dictionaries when used as an iterable - rather than model-instance objects.
defer(*fields)
Field lookups
dates(field - kind - order='ASC')
values(*fields)
43. Lookup type that returns results in a given list.
in
relationship spanning
filter(**kwargs)
day
44. Exception raised by get(**kwargs) if more than one item matches the query.
MultipleObjectsReturned
create(**kwargs)
filter(**kwargs)
exact
45. 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
reverse name
filter
regex
intermediate models
46. Lookup type for date/datetime fields that finds an exact month match. Takes an integer 1 (January) through 12
Q(question__istartswith='What')
relationship spanning
month
create(**kwargs)
47. True if the QuerySet has an order_by() clause or a default ordering on the model. False otherwise.
update()
extra(select=None - where=None - params=None - tables=None - order_by=None - select_params=None)
many-to-many relationship
ordered
48. Lookup type that finds a case-sensitive regular expression match.
using(alias)
add()
iexact
regex
49. This query finds all entries between a start date of start_date and an end date of end_date.
Proxy model
Entry.objects.filter(pub_date__range=(start_date - end_date))
relationship spanning
search
50. Lookup type that returns results that fall into an inclusive date range.
year
Entry.objects.filter(id__gt=4)
range
aggregate(args - *kwargs)
Sorry!:) No result found.
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