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






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






3. 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.






4. 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.






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






6. 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






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

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8. 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.






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






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






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






12. 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.






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






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






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






16. This gives your model metadata.






17. 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.






18. Fields are specified by these






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






20. 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






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






22. 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.






23. 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.






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






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






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






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






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






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






30. 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






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






32. A manager method which returns a single object. If there are no results that match the query - this method will raise a DoesNotExist exception. If more than one item matches this query - the method will raise MultipleObjectsReturned.






33. 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.






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






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






36. This represents a collection of objects from your database. It can have zero - one or many filters.






37. Returns a dictionary of aggregate values (averages - sums - etc) calculated over the QuerySet. Each argument to this method specifies a value that will be included in the dictionary that is returned.






38. An iterable (e.g. - a list or tuple) of 2-tuples to use as options for this field. If this is given - Django's admin will use a select box instead of the standard text field and will limit options to those given.






39. 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.






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






41. Conjuntion operator for Q objects.






42. 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






43. 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.






44. 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






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






46. This method immediately deletes the object and has no return value.






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






48. 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






49. 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






50. 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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