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

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2. The database that will be used if this query is executed now
search
get_or_create(**kwargs)
dates(field - kind - order='ASC')
db

3. Lookup type that returns results with a case-sensitive end sequence.
delete()
lt
endswith
save()

4. 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
==
relationship spanning
choices tuple
Meta class

5. A manager method that returns a new QuerySet containing objects that do not match the given lookup parameters.
exclude(**kwargs)
Model metadata
only(*fields)
values(*fields)

6. 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
iendswith
get(**kwargs)
delete()

7. Can be used to remove all many-to-many relationships for an instance
many-to-one relationship
ManyToManyField
choices
clear() method

8. A Q object that asks for entries with a question value that start with 'Who' or do not have a publication date of 2005.

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9. Keyword shortcut for looking up an object by primary key.
filter(**kwargs)
pk
dates(field - kind - order='ASC')
F()

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.
order_by(*fields)
|
Q(question__startswith='Who') | ~Q(pub_date__year=2005)
~

11. Lookup type for date/datetime fields that finds a 'day of the week' match.
week_day
search
lte
Entry.objects.filter(id__in=[1 - 3 - 4])

12. Lookup type that returns results in a given list.
iexact
count()
month
in

13. 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
Entry.objects.filter(pub_date__range=(start_date - end_date))
intermediate models
one-to-one relationship
exists()

14. Negation operator for Q objects.
Entry.objects.filter(id__in=[1 - 3 - 4])
~
Abstract base class
count()

15. The default for this is the name of the child class followed by '_set'.
count()
==
reverse name
edit your settings file and change the INSTALLED_APPS setting to add the name of the module that contains your models.py.

16. These are specified as keyword arguments to the QuerySet methods filter() - exclude() and get(). These take the form field__lookuptype=value .
Field lookups
startswith
delete()
aggregate(args - *kwargs)

17. 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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18. 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
Q(question__istartswith='What')
OneToOneField
filter chaining

19. 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()
many-to-many relationship
class type

20. This gives your model metadata.
iteration
id field
Meta class
Multi-table inheritance

21. 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.
add()
aggregate(args - *kwargs)
Multi-table inheritance
ordered

22. 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
year
filter
class type
~

23. Defined by a OneToOneField. You use it just like any other Field type: by including it as a class attribute of your model.
Meta class
through argument
one-to-one relationship
week_day

24. 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.
Custom model methods
gt
Q()
null

25. 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.
F()
exact
dates(field - kind - order='ASC')
edit your settings file and change the INSTALLED_APPS setting to add the name of the module that contains your models.py.

26. This query finds all entries between a start date of start_date and an end date of end_date.
Manager methods
dates(field - kind - order='ASC')
unique
Entry.objects.filter(pub_date__range=(start_date - end_date))

27. 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
annotate(args - *kwargs)
get_or_create(**kwargs)
Proxy model
id field

28. This query finds all entries with an id in the list [1 - 3 - 4]
Entry.objects.filter(id__in=[1 - 3 - 4])
class type
class attributes
Abstract base class

29. This query deletes all Entry objects with a pub_date year of 2005.
values(*fields)
year
exists()
Entry.objects.filter(pub_date__year=2005).delete()

30. Each one of these is a Python class that subclasses django.db.models.Model. Each attribute of one of these represents a database field.
lte
isnull
model
aggregate(args - *kwargs)

31. 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)
Model metadata
save()
id field
filter(**kwargs)

32. Returns an integer representing the number of objects in the database matching the QuerySet. This never raises exceptions.
relationship spanning
ForeignKey
count()
values_list(*fields)

33. Lookup type that finds a case-sensitive regular expression match.
DoesNotExist
regex
related_name
Q()

34. 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()
year
Manager

35. This model method is used for updating a ManyToManyField.
OneToOneField
Manager methods
Q(question__istartswith='What')
add()

36. 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.
Entry.objects.filter(pub_date__year=2005).delete()
clear() method
using(alias)
relationship spanning

37. This model method saves a model instance to the database. This method has no return value.
regex
isnull
save()
class type

38. A convenience method for constructing an object and saving it all in one step.
evaluation
gt
many-to-many relationship
create(**kwargs)

39. 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
Entry.objects.filter(pub_date__range=(start_date - end_date))
iterator()
Many-to-many relationship through an intermediate model
startswith

40. If True - the table does not permit duplicate values for this field.
unique
DoesNotExist
Multi-table inheritance
slicing

41. 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
Many-to-many relationship through an intermediate model
Q(question__startswith='Who') | ~Q(pub_date__year=2005)
through argument
iregex

42. Returns the most recent object in the table - by date - using the field_name provided as the date field.
Field lookups
ordered
latest(field_name=None)
get_absolute_url()

43. 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.
in
filter(**kwargs)
filter chaining
istartswith

44. Operator for comparing two model instances for equality. Behind the scenes - it compares the primary key values of two models.
choices
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

45. If True - this field is the primary key for the model.
unique
primary_key
OneToOneField
Proxy model

46. Manager method used to retrieve every object in a model.
values_list(*fields)
reverse name
all()
Field lookups

47. Fields are specified by these
Entry.objects.filter(id__in=[1 - 3 - 4])
defer(*fields)
Entry.objects.filter(pub_date__year=2007).update(headline='Everything is the same')
class attributes

48. 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.
QuerySet
isnull
pickling
month

49. 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
Abstract base class
F()
Restrictions on field names
Manager methods

50. Lookup type that returns results with a case-insensitive end sequence.
iendswith
slicing
Entry.objects.filter(pub_date__range=(start_date - end_date))
model