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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. Returns a ValuesQuerySet -- a QuerySet that returns dictionaries when used as an iterable - rather than model-instance objects.
values(*fields)
update()
contains
lte

2. 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
in
istartswith
pk

3. Defines a many-to-many relationship. You use it just like any other Field type: by including it as a class attribute of your model.
reverse()
Abstract base class
ManyToManyField
lt

4. 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
Abstract base class
range
choices
choices tuple

5. 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
gte
through argument
none()
class attributes

6. 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.
all()
get_or_create(**kwargs)
exact
get_absolute_url()

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.
update(**kwargs)
istartswith
Q()

8. If you are using this attribute on a ForeignKey or ManyToManyField - you must always specify a unique reverse name for the field.
Many-to-many relationship to self
iterator()
Model metadata
related_name

9. 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
exists()
lte
exact

10. 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.
gte
update()
range
aggregate(args - *kwargs)

11. A QuerySet is iterable - and it executes its database query the first time you iterate over it.
iteration
Q()
get(**kwargs)
dates(field - kind - order='ASC')

12. This query deletes all Entry objects with a pub_date year of 2005.
Entry.objects.filter(pub_date__year=2005).delete()
default
|
using(alias)

13. (1) These cannot be Python reserved words - because that would result in a Python syntax error. (2) These cannot contain more than one underscore in a row - due to the way Django's query lookup syntax works.
get(**kwargs)
edit your settings file and change the INSTALLED_APPS setting to add the name of the module that contains your models.py.
ManyToManyField
Restrictions on field names

14. Exception raised by get(**kwargs) if no items match the query.
Entry.objects.filter(id__gt=4)
class type
DoesNotExist
ForeignKey

15. This query finds all entries with an id in the list [1 - 3 - 4]
regex
contains
Entry.objects.filter(id__in=[1 - 3 - 4])
filter(**kwargs)

16. 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)
Restrictions on field names
Model metadata
model
in_bulk(id_list)

17. The default for this is the name of the child class followed by '_set'.
evaluation
endswith
reverse name
pickling

18. 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()
relationship spanning
order_by(*fields)
get(**kwargs)

19. 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()
istartswith
using(alias)
only(*fields)

20. Lookup type that finds a case-insensitive regular expression match.
many-to-one relationship
iregex
values_list(*fields)
Q(question__istartswith='What')

21. A Python "magic method" that returns a unicode "representation" of any object.
__unicode__()
add()
null
choices tuple

22. 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
Proxy model
istartswith
|
update(**kwargs)

23. This represents a collection of objects from your database. It can have zero - one or many filters.
QuerySet
exists()
Q(question__istartswith='What')
get_or_create(**kwargs)

24. 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.
choices
gt
Many-to-many relationship through an intermediate model
week_day

25. Lookup type that takes either True or False and corresponds to SQL queries of IS NULL and IS NOT NULL - respectively.
isnull
select_related()
in
get_absolute_url()

26. This is a criterion that narrow down a QuerySet based on given parameters.
select_related()
Many-to-many relationship through an intermediate model
pk
filter

27. 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.
evaluation
filter chaining
delete()
filter(**kwargs)

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
gt
filter(**kwargs)
model
through argument

29. If True - the table does not permit duplicate values for this field.
QuerySet
through argument
unique
reverse name

30. A convenience method for constructing an object and saving it all in one step.
extra(select=None - where=None - params=None - tables=None - order_by=None - select_params=None)
gte
create(**kwargs)
values(*fields)

31. Lookup type for date/datetime fields that finds an exact day match.
class attributes
day
evaluation
DoesNotExist

32. 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
get(**kwargs)
all()
get(**kwargs)
edit your settings file and change the INSTALLED_APPS setting to add the name of the module that contains your models.py.

33. Defined by a OneToOneField. You use it just like any other Field type: by including it as a class attribute of your model.
gte
month
one-to-one relationship
==

34. Returns a new QuerySet containing objects that match the given lookup parameters.
__unicode__()
filter(**kwargs)
order_by(*fields)
regex

35. Lookup type that returns results with a case-sensitive end sequence.
Q(question__istartswith='What')
endswith
istartswith
db

36. This gives your model metadata.
&
Meta class
DoesNotExist
ManyToManyField

37. 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
ordered
iregex
Q(question__istartswith='What')
annotate(args - *kwargs)

38. Lookup type that returns results less than a given value.
lt
in_bulk(id_list)
dates(field - kind - order='ASC')
ForeignKey

39. 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.
Abstract base class
many-to-one relationship
exclude(**kwargs)
order_by(*fields)

40. 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
all()
using(alias)
QuerySet

41. This query finds all entries with an id greater than 4.
Entry.objects.filter(id__gt=4)
iregex
istartswith
ForeignKey

42. Negation operator for Q objects.
when you add new apps to INSTALLED_APPS
~
startswith
Meta class

43. 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.
reverse()
gt
only(*fields)
QuerySet

44. True if the QuerySet has an order_by() clause or a default ordering on the model. False otherwise.
pk
count()
get(**kwargs)
ordered

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.
order_by(*fields)
__unicode__()
choices
get(**kwargs)

46. This object encapsulates a collection of keyword arguments - with the keys being field lookup types. These objects can be combined using the & and | operators - as well as negated with the ~ operator.
all()
many-to-many relationship
Q()
distinct()

47. Each one of these is a Python class that subclasses django.db.models.Model. Each attribute of one of these represents a database field.
pickling
model
contains
Q(question__startswith='Who') | ~Q(pub_date__year=2005)

48. 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
unique
defer(*fields)
regex
when you add new apps to INSTALLED_APPS

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.
Many-to-many relationship through an intermediate model
OneToOneField
Entry.objects.filter(pub_date__range=(start_date - end_date))
get_absolute_url()

50. This query updates all the headlines with pub_date in 2007 to read 'Everything is the same'.

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