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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. 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.
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/var/www/html/basicversity.com/show_quiz.php
on line
183
2. Lookup type that takes either True or False and corresponds to SQL queries of IS NULL and IS NOT NULL - respectively.
F()
order_by(*fields)
isnull
week_day
3. If True - this field is the primary key for the model.
when you add new apps to INSTALLED_APPS
primary_key
MultipleObjectsReturned
ForeignKey
4. 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.
save()
null
aggregate(args - *kwargs)
class attributes
5. 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)
Model metadata
Multi-table inheritance
many-to-many relationship
reverse()
6. Manager method used to retrieve every object in a model.
related_name
all()
class attributes
only(*fields)
7. A manager method that returns a new QuerySet containing objects that do not match the given lookup parameters.
in_bulk(id_list)
Proxy model
exclude(**kwargs)
help_text
8. This query finds all entries with an id in the list [1 - 3 - 4]
get_absolute_url()
exact
model
Entry.objects.filter(id__in=[1 - 3 - 4])
9. 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
iexact
one-to-one relationship
delete()
iterator()
10. 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
__unicode__()
all()
Q()
11. If True - the table does not permit duplicate values for this field.
edit your settings file and change the INSTALLED_APPS setting to add the name of the module that contains your models.py.
unique
Q(question__startswith='Who') | ~Q(pub_date__year=2005)
QuerySet
12. Keyword shortcut for looking up an object by primary key.
delete()
only(*fields)
pk
when you add new apps to INSTALLED_APPS
13. 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.
Entry.objects.filter(pub_date__range=(start_date - end_date))
Model metadata
id field
get_absolute_url()
14. 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.
choices tuple
get(**kwargs)
ForeignKey
OneToOneField
15. Returns the object matching the given lookup parameters
Entry.objects.filter(id__gt=4)
exact
all()
get(**kwargs)
16. 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.
&
order_by(*fields)
startswith
Entry.objects.all().update(n_pingbacks=F('n_pingbacks') + 1)
17. 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
Field lookups
year
none()
18. This query uses an F object to increment the pingback count for every entry in the blog.
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: Invalid argument supplied for foreach() in
/var/www/html/basicversity.com/show_quiz.php
on line
183
19. When to run syncdb
when you add new apps to INSTALLED_APPS
aggregate(args - *kwargs)
slicing
istartswith
20. Lookup type that returns results greater than a given value.
filter chaining
Entry.objects.filter(id__gt=4)
gt
month
21. Conjuntion operator for Q objects.
&
lte
OneToOneField
gt
22. 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
iteration
filter
clear() method
defer(*fields)
23. A convenience method for looking up an object with the given kwargs - creating one if necessary.
get_or_create(**kwargs)
values(*fields)
when you add new apps to INSTALLED_APPS
Proxy model
24. 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
update(**kwargs)
edit your settings file and change the INSTALLED_APPS setting to add the name of the module that contains your models.py.
filter(**kwargs)
Many-to-many relationship through an intermediate model
25. 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.
Proxy model
primary_key
update()
search
26. 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.
extra(select=None - where=None - params=None - tables=None - order_by=None - select_params=None)
pickling
iterator()
isnull
27. Exception raised by get(**kwargs) if more than one item matches the query.
through argument
QuerySet
lte
MultipleObjectsReturned
28. 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.
default
Multi-table inheritance
select_related()
get(**kwargs)
29. This model method is used for updating a ManyToManyField.
get(**kwargs)
Manager
add()
Q(question__istartswith='What')
30. Returns a ValuesQuerySet -- a QuerySet that returns dictionaries when used as an iterable - rather than model-instance objects.
DoesNotExist
values(*fields)
Entry.objects.all().update(n_pingbacks=F('n_pingbacks') + 1)
annotate(args - *kwargs)
31. 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
Q(question__startswith='Who') | ~Q(pub_date__year=2005)
F()
__unicode__()
ordered
32. 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
Proxy model
search
Field lookups
lt
33. This field is added automatically - but this behavior can be overridden
id field
month
only(*fields)
Multi-table inheritance
34. 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
filter(**kwargs)
reverse name
aggregate(args - *kwargs)
class type
35. 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.
many-to-one relationship
iregex
using(alias)
gte
36. Returns a new QuerySet that uses SELECT DISTINCT in its SQL query. This eliminates duplicate rows from the query results.
aggregate(args - *kwargs)
distinct()
edit your settings file and change the INSTALLED_APPS setting to add the name of the module that contains your models.py.
year
37. A QuerySet is iterable - and it executes its database query the first time you iterate over it.
iteration
exact
clear() method
filter
38. 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
aggregate(args - *kwargs)
exact
Multi-table inheritance
39. Returns a new QuerySet containing objects that match the given lookup parameters.
default
primary_key
filter(**kwargs)
extra(select=None - where=None - params=None - tables=None - order_by=None - select_params=None)
40. Lookup type for date/datetime fields that finds an exact day match.
clear() method
get(**kwargs)
day
annotate(args - *kwargs)
41. These methods are intended to do "table-wide" things.
class type
many-to-many relationship
Manager methods
values(*fields)
42. This is a criterion that narrow down a QuerySet based on given parameters.
MultipleObjectsReturned
filter
id field
defer(*fields)
43. Lookup type that returns results with a case-sensitive start sequence.
delete()
all()
startswith
ordered
44. 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.
Manager methods
DoesNotExist
values_list(*fields)
iexact
45. This query updates all the headlines with pub_date in 2007 to read 'Everything is the same'.
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/var/www/html/basicversity.com/show_quiz.php
on line
183
46. 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
OneToOneField
relationship spanning
update()
Abstract base class
47. Lookup type that returns results in a given list.
year
all()
when you add new apps to INSTALLED_APPS
in
48. Negation operator for Q objects.
~
Entry.objects.filter(id__in=[1 - 3 - 4])
istartswith
using(alias)
49. 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.
get(**kwargs)
annotate(args - *kwargs)
iendswith
50. Can be used to remove all many-to-many relationships for an instance
DoesNotExist
distinct()
clear() method
through argument