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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. 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.






2. 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






3. 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.






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






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






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






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






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






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






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






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

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183


12. Fields are specified by these






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






14. Returns the object matching the given lookup parameters






15. A Q object that asks for entries with a question value that start with 'Who' or do not have a publication date of 2005.

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183


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






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






18. 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.






19. 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.






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






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






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






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






24. 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.






25. Conjuntion operator for Q objects.






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






27. 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.






28. 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)






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






30. 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






31. 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.






32. This is a criterion that narrow down a QuerySet based on given parameters.






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






35. 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






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






37. 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.






38. 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.






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






40. 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.






41. 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






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






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






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






45. 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.






46. 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






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






48. 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.






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






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







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