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






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






3. 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






4. Returns a QuerySet that will automatically "follow" foreign-key relationships - selecting that additional related-object data when it executes its query. This is a performance booster which results in (sometimes much) larger queries but means later u






5. 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.






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






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






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






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






10. Returns a ValuesQuerySet -- a QuerySet that returns dictionaries when used as an iterable - rather than model-instance objects.






11. 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.






12. 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.






13. 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.






14. 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)






15. 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()






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






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






18. Disjunction operator for Q objects.






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

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20. 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.






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






22. Used to get a QuerySet for a model. This is called 'objects' by default.






23. This method immediately deletes the object and has no return value.






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






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






26. 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.






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






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






29. Lookup type for date/datetime fields that finds an exact day match.






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






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






32. 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.






33. Returns the object matching the given lookup parameters






34. This represents a collection of objects from your database. It can have zero - one or many filters.






35. 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.






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






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






38. 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.






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






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






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






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






43. 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






44. 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.






45. 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.






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






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






48. Negation operator for Q objects.






49. 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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50. 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.