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






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






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






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






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






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. 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.






8. Returns the object matching the given lookup parameters






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






10. 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






11. This model method is used for updating a ManyToManyField.






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

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






15. 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






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






17. 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.






18. 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.






19. 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.






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






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






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






23. 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






24. 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






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






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






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






28. 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.






29. 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.






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. 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






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






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






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






35. To activate your models






36. 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






37. This gives your model metadata.






38. Negation operator for Q objects.






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






40. 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.






41. 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






42. Disjunction operator for Q objects.






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






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






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






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






47. 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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48. 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.






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






50. Lookup type that tests for inclusion in a case-sensitive fashion.