Test your basic knowledge |

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






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






3. Keyword shortcut for looking up an object by primary key.






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






5. 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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6. 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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7. Returns the object matching the given lookup parameters






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






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






11. 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.






12. 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.






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






14. 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






15. Use this method to reverse the order in which a queryset's elements are returned. Calling this method a second time restores the ordering back to the normal direction.






16. 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






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. 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.






19. 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.






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






21. 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.






22. 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.






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






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






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






26. The database that will be used if this query is executed now






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






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






29. 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.






30. Here - you can't use add - create - or assignment (i.e. - beatles.members = [...]) to create relationships. You need to specify all the detail for the relationship required by the intermediate model.






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






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






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






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






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






36. 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)






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






38. 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






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






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






41. 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






42. 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.






43. This object allows you to compare the value of a model field with another field on the same model. Django supports the use of addition - subtraction - multiplication - division and modulo arithmetic with these objects - both with constants and with o






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






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






46. Negation operator for Q objects.






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






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






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






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