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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. Lookup type for date/datetime fields that finds an exact year match. Takes a four-digit year.
DoesNotExist
year
Entry.objects.all().update(n_pingbacks=F('n_pingbacks') + 1)
get_absolute_url()
2. 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.
pk
Manager
only(*fields)
many-to-one relationship
3. 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.
get(**kwargs)
Entry.objects.filter(id__in=[1 - 3 - 4])
==
using(alias)
4. This method immediately deletes the object and has no return value.
filter(**kwargs)
delete()
Restrictions on field names
iregex
5. 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
year
class type
relationship spanning
db
6. This gives your model metadata.
|
Meta class
choices
month
7. 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
Proxy model
Abstract base class
only(*fields)
related_name
8. 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.
get(**kwargs)
filter(**kwargs)
Many-to-many relationship to self
year
9. 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
10. Lookup type that finds a case-sensitive regular expression match.
ordered
filter
iregex
regex
11. 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
all()
QuerySet
edit your settings file and change the INSTALLED_APPS setting to add the name of the module that contains your models.py.
get(**kwargs)
12. A convenience method for looking up an object with the given kwargs - creating one if necessary.
regex
count()
one-to-one relationship
get_or_create(**kwargs)
13. Keyword shortcut for looking up an object by primary key.
lte
order_by(*fields)
pk
values_list(*fields)
14. Used to get a QuerySet for a model. This is called 'objects' by default.
Many-to-many relationship through an intermediate model
delete()
Manager
iregex
15. 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.
extra(select=None - where=None - params=None - tables=None - order_by=None - select_params=None)
Many-to-many relationship to self
only(*fields)
choices
16. Lookup type that returns results with a case-sensitive start sequence.
ForeignKey
reverse()
get_or_create(**kwargs)
startswith
17. Returns a dictionary of aggregate values (averages - sums - etc) calculated over the QuerySet. Each argument to this method specifies a value that will be included in the dictionary that is returned.
aggregate(args - *kwargs)
contains
in
save()
18. Operator for comparing two model instances for equality. Behind the scenes - it compares the primary key values of two models.
blank
get_absolute_url()
==
default
19. 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()
in_bulk(id_list)
extra(select=None - where=None - params=None - tables=None - order_by=None - select_params=None)
pk
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. These methods are intended to do "table-wide" things.
blank
startswith
Manager methods
model
22. Negation operator for Q objects.
Meta class
~
Entry.objects.filter(pub_date__range=(start_date - end_date))
default
23. (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.
Q(question__istartswith='What')
Restrictions on field names
exclude(**kwargs)
~
24. Evaluation happens upon use the "step" parameter of slice syntax - the first time you iterate over it - when pickling or caching results - upon calling repr() - upon calling len() - upon calling list() - upon calling bool()
none()
gt
evaluation
exists()
25. To activate your models
edit your settings file and change the INSTALLED_APPS setting to add the name of the module that contains your models.py.
exclude(**kwargs)
reverse()
slicing
26. If this option is True - the field is allowed to be blank. Default is False.
blank
slicing
exclude(**kwargs)
F()
27. 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.
DoesNotExist
lte
Entry.objects.filter(id__in=[1 - 3 - 4])
ManyToManyField
28. 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
save()
when you add new apps to INSTALLED_APPS
none()
29. This field is added automatically - but this behavior can be overridden
startswith
id field
only(*fields)
save()
30. Lookup type that tests for inclusion in a case-sensitive fashion.
contains
__unicode__()
ForeignKey
ManyToManyField
31. Lookup type that returns results less than or equal to a given value.
delete()
class type
lte
&
32. 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
all()
lte
only(*fields)
db
33. Conjuntion operator for Q objects.
distinct()
regex
&
select_related()
34. 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.
values(*fields)
class attributes
__unicode__()
in_bulk(id_list)
35. 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.
iregex
==
update(**kwargs)
OneToOneField
36. When to run syncdb
all()
OneToOneField
values(*fields)
when you add new apps to INSTALLED_APPS
37. Returns a ValuesQuerySet -- a QuerySet that returns dictionaries when used as an iterable - rather than model-instance objects.
values(*fields)
delete()
add()
endswith
38. 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
__unicode__()
extra(select=None - where=None - params=None - tables=None - order_by=None - select_params=None)
gt
update(**kwargs)
39. 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
contains
iregex
Entry.objects.filter(id__in=[1 - 3 - 4])
40. 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
41. Lookup type that takes either True or False and corresponds to SQL queries of IS NULL and IS NOT NULL - respectively.
F()
isnull
get_absolute_url()
aggregate(args - *kwargs)
42. Lookup type for date/datetime fields that finds an exact month match. Takes an integer 1 (January) through 12
MultipleObjectsReturned
in_bulk(id_list)
&
month
43. Lookup type that returns results greater than or equal to a given value.
class attributes
annotate(args - *kwargs)
gte
db
44. 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
model
Proxy model
reverse()
clear() method
45. 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
delete()
in_bulk(id_list)
isnull
46. Can be used to remove all many-to-many relationships for an instance
filter(**kwargs)
using(alias)
clear() method
iexact
47. This query finds all entries with an id greater than 4.
Entry.objects.filter(id__gt=4)
many-to-many relationship
search
reverse name
48. 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.
filter(**kwargs)
all()
pickling
Abstract base class
49. This query finds all entries with an id in the list [1 - 3 - 4]
create(**kwargs)
Entry.objects.all().update(n_pingbacks=F('n_pingbacks') + 1)
Entry.objects.filter(id__in=[1 - 3 - 4])
Q(question__istartswith='What')
50. 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.
pickling
latest(field_name=None)
related_name
default