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Django Queryset

Subject : it-skills

Instructions:

Answer 50 questions in 15 minutes.
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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. Conjuntion operator for Q objects.
default
defer(*fields)
&
dates(field - kind - order='ASC')

2. This is a criterion that narrow down a QuerySet based on given parameters.
when you add new apps to INSTALLED_APPS
filter
year
&

3. A Python "magic method" that returns a unicode "representation" of any object.
clear() method
values(*fields)
regex
__unicode__()

4. A QuerySet is iterable - and it executes its database query the first time you iterate over it.
iendswith
iteration
filter(**kwargs)
DoesNotExist

5. 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

6. Lookup type that returns results with a case-insensitive end sequence.
delete()
endswith
iendswith
Entry.objects.filter(id__gt=4)

7. Disjunction operator for Q objects.
|
Entry.objects.filter(id__in=[1 - 3 - 4])
ForeignKey
Proxy model

8. 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.
get_absolute_url()
annotate(args - *kwargs)
contains
get(**kwargs)

9. 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)
get_or_create(**kwargs)
primary_key
choices

10. 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
one-to-one relationship
OneToOneField
clear() method
class type

11. These methods are intended to do "table-wide" things.
year
Manager methods
exclude(**kwargs)
many-to-many relationship

12. Keyword shortcut for looking up an object by primary key.
iendswith
Q(question__startswith='Who') | ~Q(pub_date__year=2005)
pk
iteration

13. 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.
values_list(*fields)
gte
unique
using(alias)

14. A Manager method that returns a new QuerySet containing objects that match the given lookup parameters.
null
Many-to-many relationship through an intermediate model
iterator()
filter(**kwargs)

15. 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.
iteration
choices tuple
MultipleObjectsReturned
update()

16. Returns a ValuesQuerySet -- a QuerySet that returns dictionaries when used as an iterable - rather than model-instance objects.
Manager
values(*fields)
Many-to-many relationship through an intermediate model
annotate(args - *kwargs)

17. These add custom "row-level" functionality to your objects. These act on a particular model instance.
extra(select=None - where=None - params=None - tables=None - order_by=None - select_params=None)
default
ordered
Custom model methods

18. 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.
filter
~
delete()
==

19. If True - this field is the primary key for the model.
Field lookups
primary_key
all()
in

20. 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
values_list(*fields)
choices
iexact

21. This query finds all entries with an id greater than 4.
clear() method
Entry.objects.filter(id__gt=4)
MultipleObjectsReturned
Meta class

22. True if the QuerySet has an order_by() clause or a default ordering on the model. False otherwise.
isnull
get(**kwargs)
ordered
when you add new apps to INSTALLED_APPS

23. 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
annotate(args - *kwargs)
update()
iregex
slicing

24. Operator for comparing two model instances for equality. Behind the scenes - it compares the primary key values of two models.
week_day
==
choices
Multi-table inheritance

25. 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
null
gt
iregex

26. If this option is True - the field is allowed to be blank. Default is False.
clear() method
blank
choices
in

27. 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
Entry.objects.filter(pub_date__year=2007).update(headline='Everything is the same')
clear() method
none()
update(**kwargs)

28. Lookup type that returns results with a case-sensitive start sequence.
lte
iteration
startswith
gt

29. Returns the object matching the given lookup parameters
class attributes
get(**kwargs)
db
reverse()

30. Fields are specified by these
blank
gte
class attributes
db

31. Negation operator for Q objects.
get_absolute_url()
endswith
~
QuerySet

32. Lookup type that returns results less than or equal to a given value.
lte
when you add new apps to INSTALLED_APPS
iterator()
exclude(**kwargs)

33. 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.
help_text
values(*fields)
iexact
class type

34. 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

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.
one-to-one relationship
Q(question__startswith='Who') | ~Q(pub_date__year=2005)
gte
many-to-one relationship

36. 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
iendswith
Many-to-many relationship through an intermediate model
model
F()

37. Lookup type that finds a case-insensitive regular expression match.
iregex
many-to-one relationship
endswith
search

38. 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.
exact
OneToOneField
one-to-one relationship
class attributes

39. Lookup type that returns results with a case-insensitive start sequence.
Proxy model
related_name
istartswith
ordered

40. Lookup type that returns results that fall into an inclusive date range.
range
Abstract base class
save()
using(alias)

41. Lookup type that returns results less than a given value.
lt
Q(question__istartswith='What')
edit your settings file and change the INSTALLED_APPS setting to add the name of the module that contains your models.py.
get_or_create(**kwargs)

42. Returns a new QuerySet containing objects that match the given lookup parameters.
Entry.objects.filter(pub_date__year=2007).update(headline='Everything is the same')
filter(**kwargs)
MultipleObjectsReturned
many-to-many relationship

43. 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.
get(**kwargs)
update()
F()
intermediate models

44. 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
filter
defer(*fields)
__unicode__()
gt

45. Used to get a QuerySet for a model. This is called 'objects' by default.
Manager
values(*fields)
default
primary_key

46. Lookup type for date/datetime fields that finds an exact month match. Takes an integer 1 (January) through 12
filter
month
reverse()
pk

47. 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
iregex
all()
get(**kwargs)
using(alias)

48. When to run syncdb
when you add new apps to INSTALLED_APPS
&
gt
filter(**kwargs)

49. 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
annotate(args - *kwargs)
exact
filter chaining
Abstract base class

50. Lookup type for date/datetime fields that finds a 'day of the week' match.
values(*fields)
none()
id field
week_day