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






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






3. 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.






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






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

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






7. 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






8. (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.






9. 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.






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






11. 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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12. 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.






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






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






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






16. 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






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






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






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






20. When to run syncdb






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






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






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






25. 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.






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






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

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28. Lookup type that takes either True or False and corresponds to SQL queries of IS NULL and IS NOT NULL - respectively.






29. Returns the object matching the given lookup parameters






30. 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.






31. 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






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






33. Lookup type that returns results greater than or equal to a given value.






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






35. 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.






36. 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.






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






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






39. 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






40. This gives your model metadata.






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






42. 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.






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






44. 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.






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






46. 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






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






48. 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.






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






50. 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







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