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






2. 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.


3. 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.






4. 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






5. 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.






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






7. 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






8. 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.






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






10. Disjunction operator for Q objects.






11. 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






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






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






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






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






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






17. 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.






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






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






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






21. 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






22. 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






23. a QuerySet can be sliced - using Python's array-slicing syntax.






24. Conjuntion operator for Q objects.






25. Fields are specified by these






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






27. 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.






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






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






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






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






32. 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






33. 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.






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






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






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






37. 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.






38. 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.






39. 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






40. 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.






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






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






43. 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)






44. To activate your models






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






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






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






48. 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.






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






50. 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.