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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. This gives your model metadata.
many-to-one relationship
Entry.objects.filter(pub_date__range=(start_date - end_date))
Meta class
Entry.objects.filter(id__in=[1 - 3 - 4])
2. If True - the table does not permit duplicate values for this field.
unique
search
through argument
~
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.
only(*fields)
get_or_create(**kwargs)
iregex
model
4. 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
get(**kwargs)
none()
many-to-many relationship
update(**kwargs)
5. Lookup type that returns results greater than a given value.
MultipleObjectsReturned
blank
gt
db
6. 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.
startswith
save()
using(alias)
choices tuple
7. Lookup type that returns results less than or equal to a given value.
primary_key
count()
intermediate models
lte
8. 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
Multi-table inheritance
get_or_create(**kwargs)
Many-to-many relationship to self
defer(*fields)
9. 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.
order_by(*fields)
get_absolute_url()
Custom model methods
filter chaining
10. 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.
class type
all()
reverse()
get(**kwargs)
11. A manager method that returns a new QuerySet containing objects that do not match the given lookup parameters.
Many-to-many relationship to self
exclude(**kwargs)
DoesNotExist
Restrictions on field names
12. Can be used to remove all many-to-many relationships for an instance
Entry.objects.filter(pub_date__range=(start_date - end_date))
iendswith
clear() method
create(**kwargs)
13. 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.
year
defer(*fields)
reverse()
values_list(*fields)
14. Defined by a OneToOneField. You use it just like any other Field type: by including it as a class attribute of your model.
one-to-one relationship
pickling
iendswith
filter chaining
15. The database that will be used if this query is executed now
Model metadata
db
DoesNotExist
annotate(args - *kwargs)
16. This model method is used for updating a ManyToManyField.
Q(question__startswith='Who') | ~Q(pub_date__year=2005)
db
class type
add()
17. 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.
Many-to-many relationship through an intermediate model
exclude(**kwargs)
clear() method
iendswith
18. 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
19. This method returns tuples of values when iterated over. Each tuple contains the value from the respective field passed into the call to this method -- so the first item is the first field - etc.
__unicode__()
gt
values_list(*fields)
blank
20. Returns a QuerySet that will automatically "follow" foreign-key relationships - selecting that additional related-object data when it executes its query. This is a performance booster which results in (sometimes much) larger queries but means later u
exact
Entry.objects.filter(id__gt=4)
Entry.objects.filter(pub_date__range=(start_date - end_date))
select_related()
21. Lookup type that returns results in a given list.
Q(question__startswith='Who') | ~Q(pub_date__year=2005)
related_name
choices
in
22. Conjuntion operator for Q objects.
delete()
&
Multi-table inheritance
pickling
23. Returns a ValuesQuerySet -- a QuerySet that returns dictionaries when used as an iterable - rather than model-instance objects.
update()
help_text
OneToOneField
values(*fields)
24. Lookup type that tests for inclusion in a case-sensitive fashion.
relationship spanning
contains
model
exists()
25. 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()
OneToOneField
get(**kwargs)
choices tuple
26. 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.
get_or_create(**kwargs)
filter chaining
ManyToManyField
gte
27. 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)
exact
~
Model metadata
intermediate models
28. Lookup type that takes either True or False and corresponds to SQL queries of IS NULL and IS NOT NULL - respectively.
endswith
isnull
all()
Q()
29. 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
filter(**kwargs)
Q(question__startswith='Who') | ~Q(pub_date__year=2005)
Proxy model
values_list(*fields)
30. 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.
help_text
lte
Many-to-many relationship to self
exact
31. 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.
db
==
default
extra(select=None - where=None - params=None - tables=None - order_by=None - select_params=None)
32. This query finds all entries with an id greater than 4.
help_text
Q(question__istartswith='What')
Entry.objects.filter(pub_date__range=(start_date - end_date))
Entry.objects.filter(id__gt=4)
33. A convenience method for looking up an object with the given kwargs - creating one if necessary.
Q(question__startswith='Who') | ~Q(pub_date__year=2005)
regex
gt
get_or_create(**kwargs)
34. 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
35. 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.
select_related()
reverse()
delete()
iexact
36. Keyword shortcut for looking up an object by primary key.
annotate(args - *kwargs)
pk
create(**kwargs)
choices tuple
37. Lookup type for date/datetime fields that finds an exact year match. Takes a four-digit year.
slicing
extra(select=None - where=None - params=None - tables=None - order_by=None - select_params=None)
Model metadata
year
38. Exception raised by get(**kwargs) if no items match the query.
DoesNotExist
update(**kwargs)
edit your settings file and change the INSTALLED_APPS setting to add the name of the module that contains your models.py.
Many-to-many relationship through an intermediate model
39. Returns a new QuerySet that uses SELECT DISTINCT in its SQL query. This eliminates duplicate rows from the query results.
only(*fields)
filter chaining
distinct()
filter(**kwargs)
40. Exception raised by get(**kwargs) if more than one item matches the query.
Q(question__istartswith='What')
MultipleObjectsReturned
iregex
filter
41. Lookup type that returns results greater than or equal to a given value.
ManyToManyField
gte
create(**kwargs)
Entry.objects.all().update(n_pingbacks=F('n_pingbacks') + 1)
42. This query finds all entries with an id in the list [1 - 3 - 4]
filter
Entry.objects.filter(id__in=[1 - 3 - 4])
delete()
__unicode__()
43. 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.
Proxy model
extra(select=None - where=None - params=None - tables=None - order_by=None - select_params=None)
get(**kwargs)
help_text
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.
ManyToManyField
in
edit your settings file and change the INSTALLED_APPS setting to add the name of the module that contains your models.py.
exact
45. This is a criterion that narrow down a QuerySet based on given parameters.
lte
dates(field - kind - order='ASC')
Manager methods
filter
46. This represents a collection of objects from your database. It can have zero - one or many filters.
get_or_create(**kwargs)
QuerySet
exists()
latest(field_name=None)
47. Returns the most recent object in the table - by date - using the field_name provided as the date field.
latest(field_name=None)
only(*fields)
Abstract base class
filter
48. a QuerySet can be sliced - using Python's array-slicing syntax.
slicing
class type
id field
distinct()
49. 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 tuple
choices
exact
Entry.objects.filter(pub_date__year=2005).delete()
50. 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
Sorry!:) No result found.
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