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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. When to run syncdb






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






3. 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






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






5. Lookup type that returns results less than a given value.






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






7. 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.






8. 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






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






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






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






12. 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






13. Lookup type that corresponds to a boolean full-text search - taking advantage of full-text indexing. This is like contains but is significantly faster due to full-text indexing.






14. 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.






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






16. 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.






17. Conjuntion operator for Q objects.






18. These methods are intended to do "table-wide" things.






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. Negation operator for Q objects.






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






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






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

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






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






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






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






28. 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






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






30. 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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31. 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






32. 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






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






34. 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.






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






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






38. 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.






39. 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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40. This model method is used for updating a ManyToManyField.






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






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






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






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






45. 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.






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






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. This gives your model metadata.






50. 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.