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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. Defined by a OneToOneField. You use it just like any other Field type: by including it as a class attribute of your model.
in_bulk(id_list)
one-to-one relationship
MultipleObjectsReturned
create(**kwargs)
2. When to run syncdb
when you add new apps to INSTALLED_APPS
dates(field - kind - order='ASC')
Many-to-many relationship to self
select_related()
3. A convenience method for constructing an object and saving it all in one step.
ForeignKey
create(**kwargs)
ordered
in
4. Lookup type that returns results greater than or equal to a given value.
select_related()
using(alias)
gte
many-to-one relationship
5. Conjuntion operator for Q objects.
istartswith
QuerySet
&
in_bulk(id_list)
6. 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()
add()
==
endswith
7. Returns the most recent object in the table - by date - using the field_name provided as the date field.
reverse name
many-to-one relationship
iterator()
latest(field_name=None)
8. Returns an integer representing the number of objects in the database matching the QuerySet. This never raises exceptions.
QuerySet
in_bulk(id_list)
Model metadata
count()
9. 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.
isnull
related_name
evaluation
reverse()
10. Lookup type that returns results with a case-sensitive start sequence.
Field lookups
many-to-one relationship
startswith
intermediate models
11. 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.
count()
filter chaining
Manager
id field
12. This model method is used for updating a ManyToManyField.
all()
delete()
add()
get(**kwargs)
13. This query finds all entries with an id greater than 4.
startswith
when you add new apps to INSTALLED_APPS
Entry.objects.filter(pub_date__range=(start_date - end_date))
Entry.objects.filter(id__gt=4)
14. 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
lte
exists()
related_name
one-to-one relationship
15. 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.
get(**kwargs)
Multi-table inheritance
filter(**kwargs)
delete()
16. 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.
filter(**kwargs)
exact
values(*fields)
year
17. 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
gt
select_related()
Manager methods
update()
18. Returns a new QuerySet that uses SELECT DISTINCT in its SQL query. This eliminates duplicate rows from the query results.
Multi-table inheritance
month
distinct()
day
19. Lookup type that returns results less than or equal to a given value.
primary_key
lte
exact
week_day
20. This method immediately deletes the object and has no return value.
year
delete()
reverse()
Model metadata
21. Fields are specified by these
class attributes
reverse name
relationship spanning
order_by(*fields)
22. Lookup type that returns results in a given list.
update(**kwargs)
in
regex
intermediate models
23. The default for this is the name of the child class followed by '_set'.
MultipleObjectsReturned
QuerySet
reverse name
exists()
24. Lookup type that returns results that fall into an inclusive date range.
|
range
unique
exact
25. These are specified as keyword arguments to the QuerySet methods filter() - exclude() and get(). These take the form field__lookuptype=value .
Proxy model
day
week_day
Field lookups
26. This is a criterion that narrow down a QuerySet based on given parameters.
day
regex
help_text
filter
27. A Q object that encapsulates queries for entries with a question value that starts with 'What' in a case-insensitive fashion.
Warning
: Invalid argument supplied for foreach() in
/var/www/html/basicversity.com/show_quiz.php
on line
183
28. 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
dates(field - kind - order='ASC')
Multi-table inheritance
OneToOneField
29. 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.
contains
OneToOneField
null
update()
30. True if the QuerySet has an order_by() clause or a default ordering on the model. False otherwise.
ordered
exact
Custom model methods
OneToOneField
31. A convenience method for looking up an object with the given kwargs - creating one if necessary.
choices
select_related()
Entry.objects.filter(pub_date__range=(start_date - end_date))
get_or_create(**kwargs)
32. 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
get(**kwargs)
iterator()
primary_key
exists()
33. a QuerySet can be sliced - using Python's array-slicing syntax.
slicing
blank
Entry.objects.filter(id__in=[1 - 3 - 4])
all()
34. Lookup type for date/datetime fields that finds an exact month match. Takes an integer 1 (January) through 12
endswith
exclude(**kwargs)
month
distinct()
35. 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
null
Entry.objects.filter(id__gt=4)
F()
reverse()
36. Exception raised by get(**kwargs) if no items match the query.
through argument
DoesNotExist
filter
clear() method
37. 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
reverse()
lte
__unicode__()
38. 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
39. 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
Q()
intermediate models
relationship spanning
through argument
40. To activate your models
Field lookups
Entry.objects.filter(id__in=[1 - 3 - 4])
edit your settings file and change the INSTALLED_APPS setting to add the name of the module that contains your models.py.
iregex
41. This model method saves a model instance to the database. This method has no return value.
save()
isnull
gte
Q()
42. If True - the table does not permit duplicate values for this field.
unique
dates(field - kind - order='ASC')
null
Abstract base class
43. 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
44. 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
&
filter(**kwargs)
Abstract base class
Manager
45. 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.
edit your settings file and change the INSTALLED_APPS setting to add the name of the module that contains your models.py.
isnull
endswith
choices
46. 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.
Many-to-many relationship through an intermediate model
exclude(**kwargs)
ManyToManyField
ForeignKey
47. 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
delete()
istartswith
Proxy model
~
48. Defined by a ManyToManyField. You use it just like any other Field type: by including it as a class attribute of your model.
Manager
choices tuple
many-to-many relationship
Field lookups
49. 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.
one-to-one relationship
exact
OneToOneField
__unicode__()
50. A Python "magic method" that returns a unicode "representation" of any object.
filter(**kwargs)
__unicode__()
get_absolute_url()
update(**kwargs)