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Django Queryset

Subject : it-skills

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1. 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.
defer(*fields)
update(**kwargs)
startswith
delete()

2. If this option is True - Django will store empty values as NULL in the database. Default is False.
save()
iterator()
null
Q(question__istartswith='What')

3. If True - this field is the primary key for the model.
filter(**kwargs)
values(*fields)
primary_key
class type

4. 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.
exact
intermediate models
class attributes
ForeignKey

5. Keyword shortcut for looking up an object by primary key.
pk
related_name
Model metadata
save()

6. This query finds all entries between a start date of start_date and an end date of end_date.
Restrictions on field names
Entry.objects.filter(pub_date__range=(start_date - end_date))
get(**kwargs)
lte

7. Lookup type for date/datetime fields that finds an exact month match. Takes an integer 1 (January) through 12
DoesNotExist
Entry.objects.all().update(n_pingbacks=F('n_pingbacks') + 1)
filter chaining
month

8. Lookup type that yields a case-insensitive match.
get(**kwargs)
Many-to-many relationship through an intermediate model
iexact
exclude(**kwargs)

9. A QuerySet is iterable - and it executes its database query the first time you iterate over it.
Entry.objects.all().update(n_pingbacks=F('n_pingbacks') + 1)
lte
iteration
save()

10. A convenience method for looking up an object with the given kwargs - creating one if necessary.
contains
range
get_or_create(**kwargs)
update(**kwargs)

11. Lookup type that returns results greater than or equal to a given value.
using(alias)
Meta class
in_bulk(id_list)
gte

12. 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.
Entry.objects.filter(id__in=[1 - 3 - 4])
only(*fields)
update()
save()

13. Returns an integer representing the number of objects in the database matching the QuerySet. This never raises exceptions.
add()
count()
lt
gt

14. 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.
Model metadata
default
DoesNotExist
pickling

15. 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.
all()
reverse()
using(alias)
Entry.objects.filter(pub_date__range=(start_date - end_date))

16. 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.
class attributes
month
F()
search

17. 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

18. True if the QuerySet has an order_by() clause or a default ordering on the model. False otherwise.
order_by(*fields)
select_related()
ordered
related_name

19. This is a criterion that narrow down a QuerySet based on given parameters.
lte
filter
clear() method
many-to-one relationship

20. This model method saves a model instance to the database. This method has no return value.
save()
latest(field_name=None)
startswith
one-to-one relationship

21. 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
Custom model methods
delete()
extra(select=None - where=None - params=None - tables=None - order_by=None - select_params=None)
all()

22. 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-one relationship
filter(**kwargs)
ordered
QuerySet

23. Lookup type that returns results less than or equal to a given value.
lte
Entry.objects.filter(pub_date__range=(start_date - end_date))
pickling
one-to-one relationship

24. Lookup type that tests for inclusion in a case-sensitive fashion.
contains
blank
in_bulk(id_list)
class type

25. Returns the object matching the given lookup parameters
in_bulk(id_list)
iterator()
get(**kwargs)
regex

26. 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.
extra(select=None - where=None - params=None - tables=None - order_by=None - select_params=None)
many-to-one relationship
in
endswith

27. If this option is True - the field is allowed to be blank. Default is False.
lt
update(**kwargs)
id field
blank

28. A Python "magic method" that returns a unicode "representation" of any object.
__unicode__()
all()
regex
|

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

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

30. 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.
gt
choices
help_text
Entry.objects.filter(pub_date__year=2007).update(headline='Everything is the same')

31. Returns a dictionary of aggregate values (averages - sums - etc) calculated over the QuerySet. Each argument to this method specifies a value that will be included in the dictionary that is returned.
iregex
relationship spanning
order_by(*fields)
aggregate(args - *kwargs)

32. 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()
Multi-table inheritance
through argument
ManyToManyField

33. Defined by a ManyToManyField. You use it just like any other Field type: by including it as a class attribute of your model.
filter(**kwargs)
Many-to-many relationship through an intermediate model
delete()
many-to-many relationship

34. Used to get a QuerySet for a model. This is called 'objects' by default.
all()
==
Manager
through argument

35. This query finds all entries with an id greater than 4.
filter chaining
day
defer(*fields)
Entry.objects.filter(id__gt=4)

36. 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
primary_key
related_name
in
defer(*fields)

37. Fields are specified by these
class attributes
get_or_create(**kwargs)
clear() method
Entry.objects.filter(pub_date__range=(start_date - end_date))

38. 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
db
iterator()
dates(field - kind - order='ASC')
none()

39. 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.
all()
id field
pickling
Custom model methods

40. A manager method which returns a single object. If there are no results that match the query - this method will raise a DoesNotExist exception. If more than one item matches this query - the method will raise MultipleObjectsReturned.
&
Entry.objects.filter(pub_date__year=2005).delete()
class attributes
get(**kwargs)

41. a QuerySet can be sliced - using Python's array-slicing syntax.
Manager
evaluation
slicing
filter(**kwargs)

42. Lookup type for date/datetime fields that finds an exact day match.
get_or_create(**kwargs)
day
related_name
values_list(*fields)

43. 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
one-to-one relationship
Manager
blank

44. These are specified as keyword arguments to the QuerySet methods filter() - exclude() and get(). These take the form field__lookuptype=value .
range
Field lookups
slicing
iendswith

45. Lookup type that returns results in a given list.
contains
in_bulk(id_list)
Entry.objects.all().update(n_pingbacks=F('n_pingbacks') + 1)
in

46. 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
Entry.objects.filter(id__in=[1 - 3 - 4])
Entry.objects.filter(pub_date__year=2005).delete()
Manager

47. 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.
through argument
Q()
order_by(*fields)
all()

48. Lookup type that finds a case-sensitive regular expression match.
regex
class attributes
Custom model methods
F()

49. 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.
iendswith
in_bulk(id_list)
related_name
Meta class

50. 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.
update(**kwargs)
OneToOneField
help_text
Model metadata

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Django Queryset

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