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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. 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.






2. The value given in the absence of a specified value for the field. This can be a value or a callable object. If callable it will be called every time a new object is created.






3. This gives your model metadata.






4. 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






5. 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






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






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






8. 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






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






10. 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.






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






12. 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






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






14. 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.






15. 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.






16. Operator for comparing two model instances for equality. Behind the scenes - it compares the primary key values of two models.






17. 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.






18. 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)






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






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






21. 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.






22. Evaluates the QuerySet (by performing the query) and returns an iterator over the results. A QuerySet typically caches its results internally so that repeated evaluations do not result in additional queries; this method will instead read results dire






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

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






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






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






27. To activate your models






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






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






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






31. 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






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






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






34. 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.






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






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






37. 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






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






39. A manager method that returns a new QuerySet containing objects that do not match the given lookup parameters.






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






41. 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.






42. Conjuntion operator for Q objects.






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






44. 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






45. 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






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






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






48. 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.






49. 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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50. 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