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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. 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.






2. Use this method to reverse the order in which a queryset's elements are returned. Calling this method a second time restores the ordering back to the normal direction.






3. Lookup type that returns results with a case-insensitive start sequence.






4. 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






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






6. This gives your model metadata.






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






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






9. 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.






10. 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






11. 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.






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






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






14. 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.






15. This method is for controlling which database the QuerySet will be evaluated against if you are using more than one database. The only argument this method takes is the alias of a database - as defined in DATABASES.






16. To activate your models






17. 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.






18. 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.






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






20. 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.






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






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






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






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






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






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






27. 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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28. 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






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






30. This field is added automatically - but this behavior can be overridden






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






32. 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






33. Fields are specified by these






34. Negation operator for Q objects.






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






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






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






39. 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.






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






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






42. Lookup type that yields a case-insensitive match.






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






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






45. 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






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






47. 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






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






49. 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()






50. 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.