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






2. When to run syncdb






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






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






5. Conjuntion operator for Q objects.






6. 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






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






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






9. 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.






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






11. 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.






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






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






14. 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






15. 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.






16. 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.






17. 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






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






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






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






21. Fields are specified by these






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






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






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






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






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






27. 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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28. 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






29. 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.






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






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






32. 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






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






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






35. 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






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






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






38. This query updates all the headlines with pub_date in 2007 to read 'Everything is the same'.

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39. 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






40. To activate your models






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






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






43. 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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44. 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






45. 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.






46. 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.






47. 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






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






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