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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. 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






2. 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.






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






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






5. 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.






6. 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






7. 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.






8. Returns the object matching the given lookup parameters






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






10. This gives your model metadata.






11. 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






12. 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.






13. 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.






14. 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






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






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. 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






18. Lookup type that takes either True or False and corresponds to SQL queries of IS NULL and IS NOT NULL - respectively.






19. 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.






20. 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






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






22. Fields are specified by these






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






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






25. 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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26. If this option is True - the field is allowed to be blank. Default is False.






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






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






29. 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






30. Returns an EmptyQuerySet -- a QuerySet that always evaluates to an empty list. This can be used in cases where you know that you should return an empty result set and your caller is expecting a QuerySet object (instead of returning an empty list - fo






31. 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






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






33. Returns a dictionary of aggregate values (averages - sums - etc) calculated over the QuerySet. Each argument to this method specifies a value that will be included in the dictionary that is returned.






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






35. 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()






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






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






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






39. When to run syncdb






40. Negation operator for Q objects.






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






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






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






45. 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.






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






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






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






49. 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.






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

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