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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. 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.






2. 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.






3. 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






4. 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






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






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






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






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






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






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






12. When to run syncdb






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






14. 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.






15. 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.






16. 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.






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






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






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






20. Conjuntion operator for Q objects.






21. 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






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






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






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






25. 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.






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






27. 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






28. This query finds all entries with an id greater than 4.






29. 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.






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






31. 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






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






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






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






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






36. 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.






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






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






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






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






41. 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






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. 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.






44. 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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45. This gives your model metadata.






46. 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()






47. 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.






48. 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.






49. If True - the table does not permit duplicate values for this field.






50. Disjunction operator for Q objects.