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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. Fields are specified by these






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






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






4. 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.






5. 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.






6. 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.






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






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






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






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






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






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






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






14. Takes a list of primary-key values and returns a dictionary mapping each primary-key value to an instance of the object with the given ID.






15. 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.






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






17. 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






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






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






20. 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






21. 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






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






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






24. 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.






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

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183


26. (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.






27. 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






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






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






30. Lookup type for date/datetime fields that finds an exact year match. Takes a four-digit year.






31. 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.






32. 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.






33. 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.






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






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






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

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183


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






38. restrictions on ________: (1) Your intermediate model must contain one - and only one - foreign key to the target model. (2) Your intermediate model must contain one - and only one - foreign key to the source model. (3) When defining a many-to-many r






39. To activate your models






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






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






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






43. 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.






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






45. 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.






46. 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.






47. 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.






48. 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.






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. Returns the object matching the given lookup parameters