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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. 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.






2. 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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3. 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






4. 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.






5. 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.






6. This query finds all entries between a start date of start_date and an end date of end_date.






7. If this option is True - Django will store empty values as NULL in the database. Default is False.






8. 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.






9. 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.






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






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






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






13. These methods are intended to do "table-wide" things.






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






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






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






17. 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






18. Conjuntion operator for Q objects.






19. 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






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






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






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






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






24. 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.






25. 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






26. 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)






27. 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






28. 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.






29. 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.






30. Returns a new QuerySet containing objects that match the given lookup parameters.






31. This model method saves a model instance to the database. This method has no return value.






32. 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.






33. Lookup type that tests for inclusion in a case-sensitive fashion.






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






35. 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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36. 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.






37. a QuerySet can be sliced - using Python's array-slicing syntax.






38. 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.






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






40. Lookup type that returns results with a case-insensitive end sequence.






41. 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.






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






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






44. (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.






45. Lookup type that returns results with a case-sensitive start sequence.






46. 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.






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






48. 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






49. 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.






50. 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.