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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. 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






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






3. 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.






4. Lookup type for date/datetime fields that finds a 'day of the week' match.






5. Lookup type for date/datetime fields that finds an exact month match. Takes an integer 1 (January) through 12






6. 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.






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






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






10. Exception raised by get(**kwargs) if no items match the query.






11. 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.






12. Lookup type that returns results less than a given value.






13. This field is added automatically - but this behavior can be overridden






14. This query uses an F object to increment the pingback count for every entry in the blog.

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15. 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






16. 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






17. Lookup type that returns results greater than a given value.






18. When to run syncdb






19. Lookup type that returns results in a given list.






20. 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.






21. 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.






22. These add custom "row-level" functionality to your objects. These act on a particular model instance.






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






24. 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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25. Returns the most recent object in the table - by date - using the field_name provided as the date field.






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






27. A Manager method that returns a new QuerySet containing objects that match the given lookup parameters.






28. This tells Django how to calculate the URL for an object. Django uses this in its admin interface - and any time it needs to figure out a URL for an object.






29. 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






30. 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






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






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






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






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






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






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






37. Disjunction operator for Q objects.






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






39. This query deletes all Entry objects with a pub_date year of 2005.






40. A Python "magic method" that returns a unicode "representation" of any object.






41. 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.






42. This model method is used for updating a ManyToManyField.






43. These are specified as keyword arguments to the QuerySet methods filter() - exclude() and get(). These take the form field__lookuptype=value .






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.






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






46. Lookup type that returns results less than or equal to a given value.






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






48. 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.






49. Lookup type for date/datetime fields that finds an exact year match. Takes a four-digit year.






50. 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