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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. 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.
DoesNotExist
related_name
choices
OneToOneField
2. 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.
iendswith
in_bulk(id_list)
lte
related_name
3. A convenience method for looking up an object with the given kwargs - creating one if necessary.
in
choices tuple
reverse()
get_or_create(**kwargs)
4. 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()
Restrictions on field names
aggregate(args - *kwargs)
iteration
5. Lookup type that returns results with a case-insensitive end sequence.
only(*fields)
choices
iendswith
using(alias)
6. 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.
day
OneToOneField
iendswith
Q()
7. 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.
values_list(*fields)
primary_key
count()
8. 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
exact
contains
only(*fields)
exists()
9. 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.
exact
Many-to-many relationship through an intermediate model
using(alias)
day
10. Returns the most recent object in the table - by date - using the field_name provided as the date field.
latest(field_name=None)
delete()
startswith
reverse()
11. Lookup type that returns results that fall into an inclusive date range.
Q(question__startswith='Who') | ~Q(pub_date__year=2005)
range
delete()
in_bulk(id_list)
12. When to run syncdb
when you add new apps to INSTALLED_APPS
many-to-one relationship
add()
filter(**kwargs)
13. This model method is used for updating a ManyToManyField.
&
latest(field_name=None)
id field
add()
14. Lookup type that returns results with a case-sensitive start sequence.
startswith
count()
latest(field_name=None)
distinct()
15. A convenience method for constructing an object and saving it all in one step.
create(**kwargs)
iteration
null
filter
16. True if the QuerySet has an order_by() clause or a default ordering on the model. False otherwise.
Entry.objects.filter(id__gt=4)
reverse()
ordered
in_bulk(id_list)
17. Specifies the model that will be used to govern the many-to-many relationship. You can then put extra fields on the intermediate model. The intermediate model is associated with the ManyToManyField using this to point to the model that will act as an
through argument
class attributes
many-to-one relationship
exact
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.
choices
get_absolute_url()
update(**kwargs)
__unicode__()
19. a QuerySet can be sliced - using Python's array-slicing syntax.
slicing
choices tuple
Model metadata
save()
20. Returns a new QuerySet that uses SELECT DISTINCT in its SQL query. This eliminates duplicate rows from the query results.
day
latest(field_name=None)
exact
distinct()
21. 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.
evaluation
contains
many-to-one relationship
get_or_create(**kwargs)
22. Disjunction operator for Q objects.
Many-to-many relationship to self
|
Q(question__istartswith='What')
iterator()
23. Lookup type that returns results less than or equal to a given value.
delete()
lte
Multi-table inheritance
day
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
primary_key
iterator()
through argument
ordered
25. 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.
Many-to-many relationship to self
exclude(**kwargs)
Restrictions on field names
lte
26. Returns a new QuerySet containing objects that match the given lookup parameters.
aggregate(args - *kwargs)
many-to-one relationship
filter(**kwargs)
only(*fields)
27. 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()
Manager methods
iexact
evaluation
day
28. Lookup type that returns results with a case-sensitive end sequence.
extra(select=None - where=None - params=None - tables=None - order_by=None - select_params=None)
select_related()
endswith
reverse()
29. Returns the object matching the given lookup parameters
get(**kwargs)
db
edit your settings file and change the INSTALLED_APPS setting to add the name of the module that contains your models.py.
QuerySet
30. 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.
select_related()
Entry.objects.filter(pub_date__year=2007).update(headline='Everything is the same')
using(alias)
update()
31. Accomplish this by using the field name of related fields across models - separated by double underscores - until you get to the field you want. For example - to get all Entry objects with a Blog whose name is 'Beatles Blog': Entry.objects.filter(blo
reverse()
relationship spanning
db
Restrictions on field names
32. 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
get_absolute_url()
MultipleObjectsReturned
exists()
Entry.objects.all().update(n_pingbacks=F('n_pingbacks') + 1)
33. 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')
edit your settings file and change the INSTALLED_APPS setting to add the name of the module that contains your models.py.
exact
using(alias)
34. This is a criterion that narrow down a QuerySet based on given parameters.
Entry.objects.filter(id__in=[1 - 3 - 4])
reverse name
day
filter
35. 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.
range
get(**kwargs)
when you add new apps to INSTALLED_APPS
Entry.objects.filter(id__in=[1 - 3 - 4])
36. 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
evaluation
annotate(args - *kwargs)
==
search
37. Lookup type that returns results less than a given value.
one-to-one relationship
save()
create(**kwargs)
lt
38. This gives your model metadata.
delete()
many-to-many relationship
Meta class
pk
39. Fields are specified by these
values_list(*fields)
search
class attributes
extra(select=None - where=None - params=None - tables=None - order_by=None - select_params=None)
40. Lookup type that yields a case-insensitive match.
istartswith
delete()
iexact
Entry.objects.filter(pub_date__year=2007).update(headline='Everything is the same')
41. 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
endswith
update()
create(**kwargs)
intermediate models
42. 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
iregex
exclude(**kwargs)
class type
pickling
43. Exception raised by get(**kwargs) if more than one item matches the query.
MultipleObjectsReturned
count()
&
regex
44. These methods are intended to do "table-wide" things.
annotate(args - *kwargs)
Manager methods
gte
Q()
45. 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.
choices tuple
isnull
dates(field - kind - order='ASC')
lt
46. These are specified as keyword arguments to the QuerySet methods filter() - exclude() and get(). These take the form field__lookuptype=value .
blank
Field lookups
ordered
Q(question__startswith='Who') | ~Q(pub_date__year=2005)
47. Operator for comparing two model instances for equality. Behind the scenes - it compares the primary key values of two models.
count()
==
delete()
latest(field_name=None)
48. 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.
day
dates(field - kind - order='ASC')
filter chaining
related_name
49. 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
50. 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
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