Test your basic knowledge |

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

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






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






4. 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






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






6. 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.






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






8. 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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9. Keyword shortcut for looking up an object by primary key.






10. By default - results returned by a QuerySet are ordered by the ordering tuple given by the ordering option in the model's Meta. You can override this on a per-QuerySet basis by using the this method.






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






12. Lookup type that returns results in a given list.






13. 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






14. Negation operator for Q objects.






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






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






17. 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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18. 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






19. 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.






20. This gives your model metadata.






21. 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.






22. 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






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






24. 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.






25. 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.






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






27. 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






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






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






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






31. 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)






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






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






34. 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






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






36. 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.






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






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






39. 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






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






41. 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






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






43. 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.






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






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






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






47. Fields are specified by these






48. If you pickle a QuerySet - this will force all the results to be loaded into memory prior to pickling. When you unpickle a QuerySet - it contains the results at the moment it was pickled - rather than the results that are currently in the database.






49. 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






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