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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. Lookup type that yields a case-insensitive match.
iexact
Proxy model
delete()
ForeignKey
2. Lookup type that returns results less than or equal to a given value.
Restrictions on field names
lte
evaluation
QuerySet
3. If you pickle a QuerySet - this will force all the results to be loaded into memory prior to pickling. When you unpickle a QuerySet - it contains the results at the moment it was pickled - rather than the results that are currently in the database.
iregex
defer(*fields)
values(*fields)
pickling
4. 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 to self
many-to-many relationship
week_day
~
5. This query deletes all Entry objects with a pub_date year of 2005.
many-to-many relationship
gt
update()
Entry.objects.filter(pub_date__year=2005).delete()
6. 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()
Manager
Entry.objects.filter(pub_date__year=2007).update(headline='Everything is the same')
evaluation
get_absolute_url()
7. This represents a collection of objects from your database. It can have zero - one or many filters.
Entry.objects.all().update(n_pingbacks=F('n_pingbacks') + 1)
QuerySet
filter(**kwargs)
create(**kwargs)
8. If True - the table does not permit duplicate values for this field.
latest(field_name=None)
unique
OneToOneField
istartswith
9. 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.
model
unique
ForeignKey
exact
10. Lookup type that returns results with a case-sensitive start sequence.
edit your settings file and change the INSTALLED_APPS setting to add the name of the module that contains your models.py.
startswith
contains
filter(**kwargs)
11. 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.
through argument
default
iregex
Proxy model
12. Lookup type for date/datetime fields that finds a 'day of the week' match.
week_day
Q()
extra(select=None - where=None - params=None - tables=None - order_by=None - select_params=None)
save()
13. Disjunction operator for Q objects.
range
|
unique
filter
14. 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.
Warning
: Invalid argument supplied for foreach() in
/var/www/html/basicversity.com/show_quiz.php
on line
183
15. 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
many-to-one relationship
exclude(**kwargs)
MultipleObjectsReturned
iterator()
16. 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.
Many-to-many relationship through an intermediate model
in_bulk(id_list)
class type
aggregate(args - *kwargs)
17. 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.
choices
contains
QuerySet
clear() method
18. These are specified as keyword arguments to the QuerySet methods filter() - exclude() and get(). These take the form field__lookuptype=value .
Field lookups
Restrictions on field names
iexact
intermediate models
19. 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
order_by(*fields)
in_bulk(id_list)
update(**kwargs)
exact
20. If this option is True - Django will store empty values as NULL in the database. Default is False.
null
many-to-many relationship
get_absolute_url()
search
21. Manager method used to retrieve every object in a model.
iregex
all()
iterator()
only(*fields)
22. To activate your models
ordered
all()
edit your settings file and change the INSTALLED_APPS setting to add the name of the module that contains your models.py.
pickling
23. Returns the object matching the given lookup parameters
get(**kwargs)
Manager methods
iexact
only(*fields)
24. 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
25. Defined by a OneToOneField. You use it just like any other Field type: by including it as a class attribute of your model.
select_related()
choices
one-to-one relationship
in
26. 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
only(*fields)
get_absolute_url()
Abstract base class
filter(**kwargs)
27. Exception raised by get(**kwargs) if no items match the query.
Proxy model
DoesNotExist
filter(**kwargs)
Multi-table inheritance
28. 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.
day
Entry.objects.filter(id__in=[1 - 3 - 4])
extra(select=None - where=None - params=None - tables=None - order_by=None - select_params=None)
in
29. True if the QuerySet has an order_by() clause or a default ordering on the model. False otherwise.
ordered
__unicode__()
distinct()
range
30. Returns the most recent object in the table - by date - using the field_name provided as the date field.
get(**kwargs)
latest(field_name=None)
values_list(*fields)
evaluation
31. 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
relationship spanning
contains
default
32. Exception raised by get(**kwargs) if more than one item matches the query.
reverse name
get_absolute_url()
ordered
MultipleObjectsReturned
33. 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.
endswith
db
startswith
using(alias)
34. Returns True if the QuerySet contains any results - and False if not. This tries to perform the query in the simplest and fastest way possible - but it does execute nearly the same query. This means that calling this method on a queryset is faster th
exists()
Entry.objects.filter(pub_date__range=(start_date - end_date))
DoesNotExist
get(**kwargs)
35. 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)
blank
regex
Model metadata
range
36. A QuerySet is iterable - and it executes its database query the first time you iterate over it.
save()
all()
Entry.objects.filter(pub_date__range=(start_date - end_date))
iteration
37. 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.
values_list(*fields)
distinct()
in_bulk(id_list)
reverse name
38. A convenience method for looking up an object with the given kwargs - creating one if necessary.
week_day
filter(**kwargs)
get(**kwargs)
get_or_create(**kwargs)
39. 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.
iregex
intermediate models
reverse()
Many-to-many relationship to self
40. A Python "magic method" that returns a unicode "representation" of any object.
dates(field - kind - order='ASC')
filter(**kwargs)
QuerySet
__unicode__()
41. 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.
update()
lt
Q(question__istartswith='What')
values(*fields)
42. a QuerySet can be sliced - using Python's array-slicing syntax.
slicing
pk
count()
Entry.objects.all().update(n_pingbacks=F('n_pingbacks') + 1)
43. This query finds all entries between a start date of start_date and an end date of end_date.
Entry.objects.filter(pub_date__range=(start_date - end_date))
add()
pk
choices
44. 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(**kwargs)
filter chaining
all()
pickling
45. Lookup type that returns results greater than or equal to a given value.
iexact
count()
gte
OneToOneField
46. 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
select_related()
all()
Multi-table inheritance
evaluation
47. 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)
Manager
class type
distinct()
48. Lookup type that returns results greater than a given value.
Entry.objects.filter(pub_date__year=2005).delete()
class attributes
gt
ordered
49. 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
regex
defer(*fields)
update()
Many-to-many relationship to self
50. This style of inheritanc is useful when you're subclassing an existing model (perhaps something from another application entirely) and want each model to have its own database table. Here - each model in the hierarchy is a model all by itself.
edit your settings file and change the INSTALLED_APPS setting to add the name of the module that contains your models.py.
MultipleObjectsReturned
Multi-table inheritance
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