SUBJECTS
|
BROWSE
|
CAREER CENTER
|
POPULAR
|
JOIN
|
LOGIN
Business Skills
|
Soft Skills
|
Basic Literacy
|
Certifications
About
|
Help
|
Privacy
|
Terms
|
Email
Search
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.
Entry.objects.filter(pub_date__year=2007).update(headline='Everything is the same')
Many-to-many relationship to self
annotate(args - *kwargs)
OneToOneField
2. This is a criterion that narrow down a QuerySet based on given parameters.
~
pk
filter
db
3. A QuerySet is iterable - and it executes its database query the first time you iterate over it.
__unicode__()
pickling
dates(field - kind - order='ASC')
iteration
4. 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
null
==
Proxy model
startswith
5. 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
F()
reverse name
annotate(args - *kwargs)
none()
6. Returns an integer representing the number of objects in the database matching the QuerySet. This never raises exceptions.
relationship spanning
get_absolute_url()
count()
distinct()
7. By default - results returned by a QuerySet are ordered by the ordering tuple given by the ordering option in the model's Meta. You can override this on a per-QuerySet basis by using the this method.
iterator()
Field lookups
search
order_by(*fields)
8. Lookup type that returns results greater than or equal to a given value.
Q()
gte
gt
&
9. The default for this is the name of the child class followed by '_set'.
in
null
reverse name
count()
10. 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
11. 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.
lte
using(alias)
iendswith
choices tuple
12. Extra text to be displayed under the field on the object's admin form to provide assistance to users. It's useful for documentation even if your object doesn't have an admin form.
gt
clear() method
iregex
help_text
13. 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)
related_name
values_list(*fields)
Model metadata
get_or_create(**kwargs)
14. 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
relationship spanning
Meta class
clear() method
count()
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)
iendswith
help_text
exact
16. 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()
filter(**kwargs)
QuerySet
only(*fields)
17. 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.
exact
QuerySet
~
Q(question__startswith='Who') | ~Q(pub_date__year=2005)
18. Returns the most recent object in the table - by date - using the field_name provided as the date field.
ForeignKey
primary_key
latest(field_name=None)
values_list(*fields)
19. Lookup type that finds a case-insensitive regular expression match.
when you add new apps to INSTALLED_APPS
Q(question__startswith='Who') | ~Q(pub_date__year=2005)
iregex
default
20. This field is added automatically - but this behavior can be overridden
week_day
reverse()
year
id field
21. 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
choices
primary_key
model
22. Conjuntion operator for Q objects.
filter(**kwargs)
all()
&
Manager methods
23. 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)
Custom model methods
defer(*fields)
Q(question__istartswith='What')
24. 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
distinct()
isnull
all()
contains
25. 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
many-to-one relationship
Entry.objects.filter(id__gt=4)
clear() method
26. Lookup type that returns results less than a given value.
lt
reverse name
ManyToManyField
class attributes
27. A manager method that returns a new QuerySet containing objects that do not match the given lookup parameters.
values(*fields)
when you add new apps to INSTALLED_APPS
annotate(args - *kwargs)
exclude(**kwargs)
28. 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
reverse name
none()
get_absolute_url()
isnull
29. Disjunction operator for Q objects.
iexact
DoesNotExist
Multi-table inheritance
|
30. These add custom "row-level" functionality to your objects. These act on a particular model instance.
Custom model methods
defer(*fields)
dates(field - kind - order='ASC')
class type
31. Lookup type that finds a case-sensitive regular expression match.
annotate(args - *kwargs)
regex
select_related()
count()
32. 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
class type
Custom model methods
aggregate(args - *kwargs)
exact
33. Lookup type for date/datetime fields that finds an exact year match. Takes a four-digit year.
Q()
week_day
model
year
34. 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()
==
evaluation
search
values(*fields)
35. Returns a new QuerySet containing objects that match the given lookup parameters.
filter(**kwargs)
model
contains
Q(question__startswith='Who') | ~Q(pub_date__year=2005)
36. a QuerySet can be sliced - using Python's array-slicing syntax.
class attributes
evaluation
get(**kwargs)
slicing
37. If this option is True - Django will store empty values as NULL in the database. Default is False.
F()
null
MultipleObjectsReturned
Q(question__startswith='Who') | ~Q(pub_date__year=2005)
38. Lookup type for date/datetime fields that finds a 'day of the week' match.
week_day
in
in_bulk(id_list)
Q(question__startswith='Who') | ~Q(pub_date__year=2005)
39. A convenience method for constructing an object and saving it all in one step.
range
create(**kwargs)
many-to-many relationship
values_list(*fields)
40. Returns the object matching the given lookup parameters
istartswith
Entry.objects.filter(pub_date__year=2007).update(headline='Everything is the same')
get(**kwargs)
update()
41. True if the QuerySet has an order_by() clause or a default ordering on the model. False otherwise.
distinct()
get_or_create(**kwargs)
DoesNotExist
ordered
42. 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
save()
Entry.objects.filter(pub_date__range=(start_date - end_date))
count()
43. 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.
model
Entry.objects.filter(pub_date__year=2007).update(headline='Everything is the same')
default
distinct()
44. Defined by a ManyToManyField. You use it just like any other Field type: by including it as a class attribute of your model.
many-to-many relationship
Entry.objects.filter(pub_date__year=2005).delete()
null
|
45. 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
istartswith
Entry.objects.filter(id__gt=4)
only(*fields)
pickling
46. This query finds all entries with an id greater than 4.
Entry.objects.filter(id__gt=4)
iteration
ForeignKey
iexact
47. 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
select_related()
when you add new apps to INSTALLED_APPS
db
clear() method
48. This style of inheritanc is useful when you're subclassing an existing model (perhaps something from another application entirely) and want each model to have its own database table. Here - each model in the hierarchy is a model all by itself.
iteration
Multi-table inheritance
week_day
class type
49. This model method saves a model instance to the database. This method has no return value.
get_or_create(**kwargs)
iexact
save()
Manager
50. 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
update()
reverse()
in_bulk(id_list)