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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. Conjuntion operator for Q objects.






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






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






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






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






7. Disjunction operator for Q objects.






8. 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.






9. 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.






10. 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






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






12. Keyword shortcut for looking up an object by primary key.






13. 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.






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






15. 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.






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






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






18. 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.






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






20. This method returns tuples of values when iterated over. Each tuple contains the value from the respective field passed into the call to this method -- so the first item is the first field - etc.






21. This query finds all entries with an id greater than 4.






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






23. 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






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






25. 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






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






27. Performs an SQL update query for the specified fields - and returns the number of rows affected. This method is applied instantly and the only restriction on the QuerySet that is updated is that it can only update columns in the model's main table. F






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






29. Returns the object matching the given lookup parameters






30. Fields are specified by these






31. Negation operator for Q objects.






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






33. Extra text to be displayed under the field on the object's admin form to provide assistance to users. It's useful for documentation even if your object doesn't have an admin form.






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

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35. 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.






36. 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






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






38. 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.






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






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






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






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






43. 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.






44. 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






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






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






47. 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






48. When to run syncdb






49. 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






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