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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. In this case - an intermediate model can have multiple foreign keys to the source model. Here - two foreign keys to the same model are permitted - but they will be treated as the two (different) sides of the many-to-many relation.
exclude(**kwargs)
Entry.objects.all().update(n_pingbacks=F('n_pingbacks') + 1)
Many-to-many relationship to self
evaluation
2. A Python "magic method" that returns a unicode "representation" of any object.
order_by(*fields)
__unicode__()
==
ForeignKey
3. Lookup type that returns results greater than a given value.
evaluation
gt
iexact
model
4. This query finds all entries with an id greater than 4.
Entry.objects.filter(id__gt=4)
__unicode__()
iendswith
filter chaining
5. 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
related_name
id field
filter chaining
6. Defined by a OneToOneField. You use it just like any other Field type: by including it as a class attribute of your model.
day
==
get(**kwargs)
one-to-one relationship
7. 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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/var/www/html/basicversity.com/show_quiz.php
on line
183
8. If this option is True - the field is allowed to be blank. Default is False.
update(**kwargs)
reverse()
Entry.objects.filter(pub_date__range=(start_date - end_date))
blank
9. If True - the table does not permit duplicate values for this field.
exact
annotate(args - *kwargs)
unique
slicing
10. Lookup type that returns results greater than or equal to a given value.
lte
delete()
Manager
gte
11. These methods are intended to do "table-wide" things.
Manager methods
get(**kwargs)
exact
many-to-one relationship
12. 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
Abstract base class
db
in
none()
13. Lookup type that returns results with a case-insensitive start sequence.
istartswith
F()
db
MultipleObjectsReturned
14. 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.
ManyToManyField
F()
all()
search
15. 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
day
filter(**kwargs)
blank
defer(*fields)
16. Operator for comparing two model instances for equality. Behind the scenes - it compares the primary key values of two models.
Meta class
filter(**kwargs)
all()
==
17. Evaluation happens upon use the "step" parameter of slice syntax - the first time you iterate over it - when pickling or caching results - upon calling repr() - upon calling len() - upon calling list() - upon calling bool()
&
Many-to-many relationship to self
all()
evaluation
18. Lookup type for date/datetime fields that finds an exact month match. Takes an integer 1 (January) through 12
month
id field
exists()
all()
19. Lookup type for date/datetime fields that finds an exact day match.
lt
ManyToManyField
exists()
day
20. 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)
ordered
ForeignKey
gte
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
lt
istartswith
defer(*fields)
relationship spanning
22. If this option is True - Django will store empty values as NULL in the database. Default is False.
iterator()
null
edit your settings file and change the INSTALLED_APPS setting to add the name of the module that contains your models.py.
__unicode__()
23. Returns a new QuerySet containing objects that match the given lookup parameters.
filter(**kwargs)
Many-to-many relationship through an intermediate model
day
update()
24. Returns a ValuesQuerySet -- a QuerySet that returns dictionaries when used as an iterable - rather than model-instance objects.
delete()
Entry.objects.filter(pub_date__year=2005).delete()
values(*fields)
exclude(**kwargs)
25. Lookup type that returns results in a given list.
dates(field - kind - order='ASC')
defer(*fields)
in
null
26. Lookup type that returns results less than a given value.
lt
F()
count()
class attributes
27. A manager method that returns a new QuerySet containing objects that do not match the given lookup parameters.
gt
exclude(**kwargs)
Entry.objects.all().update(n_pingbacks=F('n_pingbacks') + 1)
get(**kwargs)
28. 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
Many-to-many relationship to self
slicing
class type
reverse()
29. 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.
filter chaining
range
intermediate models
pk
30. The default for this is the name of the child class followed by '_set'.
class attributes
help_text
reverse name
startswith
31. The database that will be used if this query is executed now
one-to-one relationship
iteration
db
model
32. If you are using this attribute on a ForeignKey or ManyToManyField - you must always specify a unique reverse name for the field.
count()
range
related_name
reverse()
33. Lookup type for date/datetime fields that finds a 'day of the week' match.
week_day
edit your settings file and change the INSTALLED_APPS setting to add the name of the module that contains your models.py.
Many-to-many relationship to self
aggregate(args - *kwargs)
34. Negation operator for Q objects.
year
~
Q(question__istartswith='What')
delete()
35. 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.
save()
exact
Restrictions on field names
delete()
36. (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.
edit your settings file and change the INSTALLED_APPS setting to add the name of the module that contains your models.py.
only(*fields)
Restrictions on field names
iexact
37. 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.
Restrictions on field names
OneToOneField
get_absolute_url()
model
38. Lookup type that finds a case-insensitive regular expression match.
iendswith
iregex
one-to-one relationship
blank
39. Lookup type that returns results with a case-sensitive start sequence.
startswith
get(**kwargs)
related_name
Entry.objects.all().update(n_pingbacks=F('n_pingbacks') + 1)
40. 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.
Many-to-many relationship to self
db
ordered
many-to-one relationship
41. 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.
aggregate(args - *kwargs)
isnull
DoesNotExist
42. Conjuntion operator for Q objects.
&
dates(field - kind - order='ASC')
related_name
day
43. When to run syncdb
get_absolute_url()
Entry.objects.filter(id__gt=4)
when you add new apps to INSTALLED_APPS
month
44. The value given in the absence of a specified value for the field. This can be a value or a callable object. If callable it will be called every time a new object is created.
lt
default
Entry.objects.filter(id__gt=4)
all()
45. Sometimes - the Django query syntax by itself can't easily express a complex WHERE clause. For these edge cases - Django provides this QuerySet modifier -- a hook for injecting specific clauses into the SQL generated by a QuerySet.
exclude(**kwargs)
extra(select=None - where=None - params=None - tables=None - order_by=None - select_params=None)
exact
get(**kwargs)
46. This model method saves a model instance to the database. This method has no return value.
QuerySet
exclude(**kwargs)
Field lookups
save()
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
Proxy model
choices tuple
Multi-table inheritance
none()
48. Returns an integer representing the number of objects in the database matching the QuerySet. This never raises exceptions.
count()
Q(question__startswith='Who') | ~Q(pub_date__year=2005)
get(**kwargs)
DoesNotExist
49. 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.
Manager
ForeignKey
select_related()
all()
50. 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
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