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Django Queryset

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. 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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2. A convenience method for constructing an object and saving it all in one step.






3. If True - this field is the primary key for the model.






4. 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






5. Extra text to be displayed under the field on the object's admin form to provide assistance to users. It's useful for documentation even if your object doesn't have an admin form.






6. Manager method used to retrieve every object in a model.






7. 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.






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

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9. 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.






10. Returns a new QuerySet that uses SELECT DISTINCT in its SQL query. This eliminates duplicate rows from the query results.






11. 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.






12. True if the QuerySet has an order_by() clause or a default ordering on the model. False otherwise.






13. 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.






14. Can be used to remove all many-to-many relationships for an instance






15. Lookup type that finds a case-sensitive regular expression match.






16. This is a criterion that narrow down a QuerySet based on given parameters.






17. This query finds all entries with an id in the list [1 - 3 - 4]






18. A manager method that returns a new QuerySet containing objects that do not match the given lookup parameters.






19. This method is more or less the opposite of defer(). You call it with the fields that should not be deferred when retrieving a model. If you have a model where almost all the fields need to be deferred - using this method to specify the complementary






20. A QuerySet is iterable - and it executes its database query the first time you iterate over it.






21. 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.






22. If you are using this attribute on a ForeignKey or ManyToManyField - you must always specify a unique reverse name for the field.






23. 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






24. To activate your models






25. 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.






26. Lookup type that returns results with a case-sensitive end sequence.






27. Each one of these is a Python class that subclasses django.db.models.Model. Each attribute of one of these represents a database field.






28. 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.






29. Conjuntion operator for Q objects.






30. restrictions on ________: (1) Your intermediate model must contain one - and only one - foreign key to the target model. (2) Your intermediate model must contain one - and only one - foreign key to the source model. (3) When defining a many-to-many r






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.






32. Defined by a ManyToManyField. You use it just like any other Field type: by including it as a class attribute of your model.






33. The default for this is the name of the child class followed by '_set'.






34. Lookup type that returns results that fall into an inclusive date range.






35. Fields are specified by these






36. A convenience method for looking up an object with the given kwargs - creating one if necessary.






37. 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.






38. 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.






39. 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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40. Returns an integer representing the number of objects in the database matching the QuerySet. This never raises exceptions.






41. 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.






42. 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






43. Defined by a OneToOneField. You use it just like any other Field type: by including it as a class attribute of your model.






44. 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()






45. Lookup type that yields a case-insensitive match.






46. 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.

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47. Lookup type that returns results greater than or equal to a given value.






48. Lookup type that returns results with a case-insensitive start sequence.






49. Lookup type that finds a case-insensitive regular expression match.






50. The first element in this iterable is the value that will be stored in the database - the second element will be displayed by the admin interface - or in a ModelChoiceField.