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






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






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






4. 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.






5. 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.






6. 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.






7. 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.






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






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






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






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. Returns a new QuerySet containing objects that match the given lookup parameters.






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






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






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






16. 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






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






18. 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.






19. Lookup type for date/datetime fields that finds an exact day match.






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






21. Lookup type for date/datetime fields that finds an exact year match. Takes a four-digit year.






22. Fields are specified by these






23. 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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24. Defined by django.db.models.ForeignKey. You use it just like any other Field type: by including it as a class attribute of your model.






25. 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






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






27. 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.






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






29. 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






30. Defines a many-to-many relationship. You use it just like any other Field type: by including it as a class attribute of your model.






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






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






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






34. 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.






35. These add custom "row-level" functionality to your objects. These act on a particular model instance.






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






37. In this case - an intermediate model can have multiple foreign keys to the source model. Here - two foreign keys to the same model are permitted - but they will be treated as the two (different) sides of the many-to-many relation.






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






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






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






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






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






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






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






45. 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.






46. 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.






47. When to run syncdb






48. 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






49. 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.






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