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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.
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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. This model method saves a model instance to the database. This method has no return value.
MultipleObjectsReturned
Model metadata
save()
endswith

2. 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
Entry.objects.filter(pub_date__year=2007).update(headline='Everything is the same')
Entry.objects.filter(id__gt=4)
relationship spanning
iteration

3. Lookup type that finds a case-sensitive regular expression match.
regex
all()
values_list(*fields)
help_text

4. Lookup type that takes either True or False and corresponds to SQL queries of IS NULL and IS NOT NULL - respectively.
all()
isnull
Many-to-many relationship to self
count()

5. 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.
gt
edit your settings file and change the INSTALLED_APPS setting to add the name of the module that contains your models.py.
only(*fields)
ForeignKey

6. A Q object that encapsulates queries for entries with a question value that starts with 'What' in a case-insensitive fashion.

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7. 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
defer(*fields)
Multi-table inheritance
Entry.objects.filter(pub_date__year=2005).delete()

8. 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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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
iterator()
QuerySet
iendswith
day

10. 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.
null
db
many-to-one relationship
create(**kwargs)

11. Defined by a OneToOneField. You use it just like any other Field type: by including it as a class attribute of your model.
&
one-to-one relationship
ordered
lte

12. Exception raised by get(**kwargs) if no items match the query.
DoesNotExist
values(*fields)
exclude(**kwargs)
Q()

13. To activate your models
Manager
exact
edit your settings file and change the INSTALLED_APPS setting to add the name of the module that contains your models.py.
iteration

14. These are specified as keyword arguments to the QuerySet methods filter() - exclude() and get(). These take the form field__lookuptype=value .
blank
OneToOneField
Field lookups
slicing

15. Lookup type that yields a case-insensitive match.
iexact
pk
Abstract base class
through argument

16. Operator for comparing two model instances for equality. Behind the scenes - it compares the primary key values of two models.
week_day
isnull
get_absolute_url()
==

17. 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.
in_bulk(id_list)
iteration
update()
relationship spanning

18. a QuerySet can be sliced - using Python's array-slicing syntax.
update()
intermediate models
annotate(args - *kwargs)
slicing

19. This query uses an F object to increment the pingback count for every entry in the blog.

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20. A convenience method for constructing an object and saving it all in one step.
create(**kwargs)
in_bulk(id_list)
latest(field_name=None)
delete()

21. Lookup type that returns results greater than a given value.
gt
iexact
class attributes
unique

22. The default for this is the name of the child class followed by '_set'.
latest(field_name=None)
values_list(*fields)
exclude(**kwargs)
reverse name

23. restrictions on ________: (1) Your intermediate model must contain one - and only one - foreign key to the target model. (2) Your intermediate model must contain one - and only one - foreign key to the source model. (3) When defining a many-to-many r
intermediate models
get_absolute_url()
defer(*fields)
iregex

24. 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.
in_bulk(id_list)
Multi-table inheritance
Manager methods
ManyToManyField

25. Disjunction operator for Q objects.
|
range
unique
all()

26. A Manager method that returns a new QuerySet containing objects that match the given lookup parameters.
iexact
Manager methods
filter(**kwargs)
lt

27. A convenience method for looking up an object with the given kwargs - creating one if necessary.
all()
get_or_create(**kwargs)
defer(*fields)
==

28. Lookup type that corresponds to a boolean full-text search - taking advantage of full-text indexing. This is like contains but is significantly faster due to full-text indexing.
range
search
update()
order_by(*fields)

29. Lookup type that returns results with a case-sensitive end sequence.
startswith
iregex
endswith
defer(*fields)

30. 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.
Meta class
slicing
aggregate(args - *kwargs)
id field

31. This query finds all entries with an id greater than 4.
reverse name
isnull
Entry.objects.filter(id__gt=4)
blank

32. Lookup type for date/datetime fields that finds an exact day match.
day
iregex
when you add new apps to INSTALLED_APPS
ForeignKey

33. This field is added automatically - but this behavior can be overridden
values_list(*fields)
Manager
id field
db

34. A manager method that returns a new QuerySet containing objects that do not match the given lookup parameters.
create(**kwargs)
clear() method
related_name
exclude(**kwargs)

35. 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.
iteration
save()
exact
choices

36. If you are using this attribute on a ForeignKey or ManyToManyField - you must always specify a unique reverse name for the field.
related_name
Meta class
count()
id field

37. Returns a new QuerySet that uses SELECT DISTINCT in its SQL query. This eliminates duplicate rows from the query results.
year
model
distinct()
Entry.objects.filter(pub_date__range=(start_date - end_date))

38. 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.
month
exact
model
aggregate(args - *kwargs)

39. 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)
get_absolute_url()
intermediate models
slicing
Model metadata

40. 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
filter
none()
annotate(args - *kwargs)
select_related()

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

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42. Negation operator for Q objects.
aggregate(args - *kwargs)
MultipleObjectsReturned
choices tuple
~

43. 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
blank
Abstract base class
help_text
exact

44. 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
unique
through argument
many-to-one relationship
latest(field_name=None)

45. 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
month
Manager
order_by(*fields)
all()

46. Can be used to remove all many-to-many relationships for an instance
class type
clear() method
update(**kwargs)
Q(question__startswith='Who') | ~Q(pub_date__year=2005)

47. 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.
OneToOneField
model
update()
distinct()

48. Lookup type that returns results that fall into an inclusive date range.
default
unique
defer(*fields)
range

49. Lookup type that returns results in a given list.
get(**kwargs)
distinct()
in
range

50. Lookup type that finds a case-insensitive regular expression match.
db
iregex
help_text
Q(question__istartswith='What')