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Django Queryset

Subject : it-skills

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Answer 50 questions in 15 minutes.
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1. 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
select_related()
year
Manager methods
class type

2. Returns the most recent object in the table - by date - using the field_name provided as the date field.
select_related()
latest(field_name=None)
annotate(args - *kwargs)
regex

3. Lookup type that finds a case-insensitive regular expression match.
Entry.objects.all().update(n_pingbacks=F('n_pingbacks') + 1)
default
iregex
Many-to-many relationship through an intermediate model

4. 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.
using(alias)
id field
reverse()
values(*fields)

5. Lookup type that finds a case-sensitive regular expression match.
month
Entry.objects.filter(id__in=[1 - 3 - 4])
reverse name
regex

6. Returns the object matching the given lookup parameters
reverse()
extra(select=None - where=None - params=None - tables=None - order_by=None - select_params=None)
get(**kwargs)
ordered

7. Disjunction operator for Q objects.
pk
values_list(*fields)
filter chaining
|

8. Returns a ValuesQuerySet -- a QuerySet that returns dictionaries when used as an iterable - rather than model-instance objects.
filter
id field
values(*fields)
in_bulk(id_list)

9. Operator for comparing two model instances for equality. Behind the scenes - it compares the primary key values of two models.
range
==
Manager methods
regex

10. If this option is True - the field is allowed to be blank. Default is False.
blank
Entry.objects.all().update(n_pingbacks=F('n_pingbacks') + 1)
Q(question__startswith='Who') | ~Q(pub_date__year=2005)
db

11. 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
filter
update(**kwargs)
db
values(*fields)

12. Lookup type that returns results less than or equal to a given value.
aggregate(args - *kwargs)
ordered
lte
null

13. A Python "magic method" that returns a unicode "representation" of any object.
lte
exists()
__unicode__()
filter(**kwargs)

14. (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.
Restrictions on field names
slicing
choices tuple
db

15. This gives your model metadata.
Meta class
all()
choices
exists()

16. This is a criterion that narrow down a QuerySet based on given parameters.
default
MultipleObjectsReturned
gte
filter

17. 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.
iregex
using(alias)
iendswith
Multi-table inheritance

18. Conjuntion operator for Q objects.
&
exists()
aggregate(args - *kwargs)
OneToOneField

19. This query deletes all Entry objects with a pub_date year of 2005.
count()
gte
Multi-table inheritance
Entry.objects.filter(pub_date__year=2005).delete()

20. Defined by a OneToOneField. You use it just like any other Field type: by including it as a class attribute of your model.
Entry.objects.filter(id__gt=4)
Entry.objects.filter(pub_date__year=2005).delete()
class type
one-to-one relationship

21. 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.
annotate(args - *kwargs)
day
many-to-one relationship
filter chaining

22. 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.
pickling
when you add new apps to INSTALLED_APPS
istartswith

23. 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.
Entry.objects.filter(id__gt=4)
search
Multi-table inheritance
db

24. True if the QuerySet has an order_by() clause or a default ordering on the model. False otherwise.
contains
values(*fields)
ordered
delete()

25. Lookup type that yields a case-insensitive match.
Q()
iexact
filter
order_by(*fields)

26. 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

27. 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.
Q()
Entry.objects.all().update(n_pingbacks=F('n_pingbacks') + 1)
iteration
Manager methods

28. Lookup type that returns results greater than a given value.
day
gt
lte
evaluation

29. Lookup type for date/datetime fields that finds an exact day match.
one-to-one relationship
blank
day
Entry.objects.filter(pub_date__year=2007).update(headline='Everything is the same')

30. Lookup type that returns results less than a given value.
lt
day
Abstract base class
only(*fields)

31. 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()
evaluation
intermediate models
filter(**kwargs)
all()

32. 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
primary_key
exists()
iterator()
Manager

33. These are specified as keyword arguments to the QuerySet methods filter() - exclude() and get(). These take the form field__lookuptype=value .
isnull
Field lookups
evaluation
Entry.objects.filter(pub_date__year=2007).update(headline='Everything is the same')

34. 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
gte
~
defer(*fields)
in_bulk(id_list)

35. These add custom "row-level" functionality to your objects. These act on a particular model instance.
iregex
when you add new apps to INSTALLED_APPS
Q(question__istartswith='What')
Custom model methods

36. Lookup type that takes either True or False and corresponds to SQL queries of IS NULL and IS NOT NULL - respectively.
isnull
exact
filter chaining
none()

37. 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.
default
update()
pickling
Q(question__istartswith='What')

38. 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(**kwargs)
Model metadata
default
lt

39. This represents a collection of objects from your database. It can have zero - one or many filters.
QuerySet
iterator()
id field
startswith

40. a QuerySet can be sliced - using Python's array-slicing syntax.
default
Proxy model
only(*fields)
slicing

41. 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.
__unicode__()
ManyToManyField
related_name
search

42. Defined by a ManyToManyField. You use it just like any other Field type: by including it as a class attribute of your model.
gte
pk
iregex
many-to-many relationship

43. Lookup type that returns results with a case-sensitive start sequence.
extra(select=None - where=None - params=None - tables=None - order_by=None - select_params=None)
none()
startswith
edit your settings file and change the INSTALLED_APPS setting to add the name of the module that contains your models.py.

44. 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.
search
Entry.objects.filter(pub_date__range=(start_date - end_date))
delete()
only(*fields)

45. When to run syncdb
range
all()
iexact
when you add new apps to INSTALLED_APPS

46. 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.
search
&
update()
annotate(args - *kwargs)

47. 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.
add()
Proxy model
intermediate models
Many-to-many relationship through an intermediate model

48. Manager method used to retrieve every object in a model.
all()
get(**kwargs)
annotate(args - *kwargs)
blank

49. Lookup type for date/datetime fields that finds a 'day of the week' match.
iendswith
Manager methods
QuerySet
week_day

50. Lookup type that returns results with a case-insensitive start sequence.
Custom model methods
gte
through argument
istartswith

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Django Queryset

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