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






2. 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






3. 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.






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






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






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






8. This gives your model metadata.






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






10. 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






11. (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.






12. 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)






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






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






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

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16. 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






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






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






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






21. 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.






22. 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.






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

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






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






26. Specifies the model that will be used to govern the many-to-many relationship. You can then put extra fields on the intermediate model. The intermediate model is associated with the ManyToManyField using this to point to the model that will act as an






27. 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.






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






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






30. 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






31. Lookup type for date/datetime fields that finds a 'day of the week' match.






32. When to run syncdb






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






34. Lookup type that returns results with a case-insensitive end sequence.






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






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






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






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






39. This query finds all entries with an id in the list [1 - 3 - 4]






40. Conjuntion operator for Q objects.






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






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






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






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






45. Negation operator for Q objects.






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






47. 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.






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






49. 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.






50. 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.