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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. Lookup type that yields a case-insensitive match.






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






3. If you pickle a QuerySet - this will force all the results to be loaded into memory prior to pickling. When you unpickle a QuerySet - it contains the results at the moment it was pickled - rather than the results that are currently in the database.






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






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






6. 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()






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






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






9. 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.






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






11. 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.






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






13. Disjunction operator for Q objects.






14. 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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15. 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






16. Takes a list of primary-key values and returns a dictionary mapping each primary-key value to an instance of the object with the given ID.






17. 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.






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






19. Performs an SQL update query for the specified fields - and returns the number of rows affected. This method is applied instantly and the only restriction on the QuerySet that is updated is that it can only update columns in the model's main table. F






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






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






22. To activate your models






23. Returns the object matching the given lookup parameters






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

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






26. 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






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






28. 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.






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






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






31. 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.






32. Exception raised by get(**kwargs) if more than one item matches the query.






33. 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.






34. 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






35. 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)






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






37. 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.






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






39. 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.






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






41. 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.






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






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






44. 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.






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






46. 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






47. Adds to each object in the QuerySet with the provided list of aggregate values (averages - sums - etc) that have been computed over the objects that are related to the objects in the QuerySet. Each argument to this is content that will be added to ea






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






49. 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






50. 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.






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