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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. A Manager method that returns a new QuerySet containing objects that match the given lookup parameters.
values(*fields)
dates(field - kind - order='ASC')
filter(**kwargs)
clear() method

2. 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.
Many-to-many relationship through an intermediate model
aggregate(args - *kwargs)
all()
iterator()

3. 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
&
choices tuple
when you add new apps to INSTALLED_APPS

4. This method is more or less the opposite of defer(). You call it with the fields that should not be deferred when retrieving a model. If you have a model where almost all the fields need to be deferred - using this method to specify the complementary
in_bulk(id_list)
Q()
only(*fields)
iteration

5. The default for this is the name of the child class followed by '_set'.
filter(**kwargs)
lt
pickling
reverse name

6. A manager method that returns a new QuerySet containing objects that do not match the given lookup parameters.
edit your settings file and change the INSTALLED_APPS setting to add the name of the module that contains your models.py.
in_bulk(id_list)
month
exclude(**kwargs)

7. This query finds all entries with an id in the list [1 - 3 - 4]
Entry.objects.filter(id__in=[1 - 3 - 4])
contains
iteration
when you add new apps to INSTALLED_APPS

8. This model method is used for updating a ManyToManyField.
isnull
&
add()
Entry.objects.all().update(n_pingbacks=F('n_pingbacks') + 1)

9. This query deletes all Entry objects with a pub_date year of 2005.
order_by(*fields)
count()
Entry.objects.filter(pub_date__year=2005).delete()
gt

10. 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.
slicing
order_by(*fields)
exclude(**kwargs)
choices

11. 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
edit your settings file and change the INSTALLED_APPS setting to add the name of the module that contains your models.py.
~
Meta class

12. Can be used to remove all many-to-many relationships for an instance
get_or_create(**kwargs)
ForeignKey
get(**kwargs)
clear() method

13. 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

14. Defined by a ManyToManyField. You use it just like any other Field type: by including it as a class attribute of your model.
intermediate models
many-to-many relationship
values_list(*fields)
clear() method

15. Lookup type that returns results with a case-insensitive end sequence.
reverse()
iendswith
default
clear() method

16. A convenience method for looking up an object with the given kwargs - creating one if necessary.
latest(field_name=None)
get_or_create(**kwargs)
iexact
Entry.objects.filter(pub_date__year=2005).delete()

17. A QuerySet is iterable - and it executes its database query the first time you iterate over it.
count()
lte
istartswith
iteration

18. Returns the most recent object in the table - by date - using the field_name provided as the date field.
Proxy model
latest(field_name=None)
pk
gt

19. 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.
search
endswith
choices
default

20. The database that will be used if this query is executed now
one-to-one relationship
values(*fields)
get_absolute_url()
db

21. 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
edit your settings file and change the INSTALLED_APPS setting to add the name of the module that contains your models.py.
relationship spanning
choices tuple
many-to-one relationship

22. Lookup type for date/datetime fields that finds a 'day of the week' match.
latest(field_name=None)
evaluation
week_day
aggregate(args - *kwargs)

23. True if the QuerySet has an order_by() clause or a default ordering on the model. False otherwise.
ordered
filter
dates(field - kind - order='ASC')
many-to-one relationship

24. Conjuntion operator for Q objects.
delete()
&
none()
Manager methods

25. 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.
choices tuple
null
month
update()

26. 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.
only(*fields)
Many-to-many relationship to self
distinct()
values_list(*fields)

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.
Custom model methods
update()
filter chaining
slicing

28. Used to get a QuerySet for a model. This is called 'objects' by default.
clear() method
OneToOneField
Manager
filter chaining

29. Lookup type that takes either True or False and corresponds to SQL queries of IS NULL and IS NOT NULL - respectively.
ManyToManyField
Manager
month
isnull

30. 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
in_bulk(id_list)
update(**kwargs)
related_name
lte

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

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183

32. This model method saves a model instance to the database. This method has no return value.
iexact
using(alias)
save()
latest(field_name=None)

33. Lookup type that yields a case-insensitive match.
clear() method
iexact
gt
db

34. Lookup type that returns results less than a given value.
lt
in
iterator()
choices tuple

35. 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.
filter(**kwargs)
in
using(alias)
startswith

36. Lookup type that returns results greater than or equal to a given value.
iexact
filter(**kwargs)
using(alias)
gte

37. Returns the object matching the given lookup parameters
lt
get(**kwargs)
&
order_by(*fields)

38. Returns a new QuerySet containing objects that match the given lookup parameters.
many-to-one relationship
get_absolute_url()
model
filter(**kwargs)

39. 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
defer(*fields)
get(**kwargs)
values(*fields)
add()

40. Keyword shortcut for looking up an object by primary key.
Q()
Entry.objects.all().update(n_pingbacks=F('n_pingbacks') + 1)
pk
Entry.objects.filter(pub_date__range=(start_date - end_date))

41. 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__year=2007).update(headline='Everything is the same')
DoesNotExist
iterator()
get_absolute_url()

42. This query finds all entries between a start date of start_date and an end date of end_date.
~
extra(select=None - where=None - params=None - tables=None - order_by=None - select_params=None)
Entry.objects.filter(pub_date__range=(start_date - end_date))
Entry.objects.filter(id__gt=4)

43. 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
class type
intermediate models
reverse name
Multi-table inheritance

44. 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)
update()
Model metadata
range
filter(**kwargs)

45. Manager method used to retrieve every object in a model.
exists()
filter(**kwargs)
DoesNotExist
all()

46. Lookup type that finds a case-sensitive regular expression match.
Multi-table inheritance
regex
MultipleObjectsReturned
ManyToManyField

47. Lookup type that tests for inclusion in a case-sensitive fashion.
endswith
contains
model
filter chaining

48. When to run syncdb
all()
all()
Custom model methods
when you add new apps to INSTALLED_APPS

49. These are specified as keyword arguments to the QuerySet methods filter() - exclude() and get(). These take the form field__lookuptype=value .
Field lookups
clear() method
gte
Entry.objects.filter(pub_date__range=(start_date - end_date))

50. Exception raised by get(**kwargs) if no items match the query.
filter(**kwargs)
pk
Manager methods
DoesNotExist