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Django Queryset

Subject : it-skills
Instructions:
  • Answer 50 questions in 15 minutes.
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  • 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. 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






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






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






5. 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






6. 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






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






8. Returns the object matching the given lookup parameters






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






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

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11. 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()






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






13. Returns a ValuesQuerySet -- a QuerySet that returns dictionaries when used as an iterable - rather than model-instance objects.






14. 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.






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






16. 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






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






18. 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






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






20. 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.






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






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






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






24. Negation operator for Q objects.






25. 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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26. 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.






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






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






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






30. 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.






31. 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






32. 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.






33. 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.






34. This gives your model metadata.






35. 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






36. 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.






37. 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)






38. Lookup type that finds a case-insensitive regular expression match.






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






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






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






42. Used to get a QuerySet for a model. This is called 'objects' by default.






43. 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.






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






45. (1) These cannot be Python reserved words - because that would result in a Python syntax error. (2) These cannot contain more than one underscore in a row - due to the way Django's query lookup syntax works.






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






47. When to run syncdb






48. To activate your models






49. 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.






50. 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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